# This file is part of Autoconf. -*- Autoconf -*- # Parameterized macros. # Copyright (C) 1992, 93, 94, 95, 96, 98, 99, 2000 # Free Software Foundation, Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. # # As a special exception, the Free Software Foundation gives unlimited # permission to copy, distribute and modify the configure scripts that # are the output of Autoconf. You need not follow the terms of the GNU # General Public License when using or distributing such scripts, even # though portions of the text of Autoconf appear in them. The GNU # General Public License (GPL) does govern all other use of the material # that constitutes the Autoconf program. # # Certain portions of the Autoconf source text are designed to be copied # (in certain cases, depending on the input) into the output of # Autoconf. We call these the "data" portions. The rest of the Autoconf # source text consists of comments plus executable code that decides which # of the data portions to output in any given case. We call these # comments and executable code the "non-data" portions. Autoconf never # copies any of the non-data portions into its output. # # This special exception to the GPL applies to versions of Autoconf # released by the Free Software Foundation. When you make and # distribute a modified version of Autoconf, you may extend this special # exception to the GPL to apply to your modified version as well, *unless* # your modified version has the potential to copy into its output some # of the text that was the non-data portion of the version that you started # with. (In other words, unless your change moves or copies text from # the non-data portions to the data portions.) If your modification has # such potential, you must delete any notice of this special exception # to the GPL from your modified version. # # Written by David MacKenzie, with help from # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, # Roland McGrath, Noah Friedman, david d zuhn, and many others. # Some people depend upon sinclude, disabled by libm4. define([sinclude], [builtin([sinclude], $@)]) ## ---------------- ## ## The diversions. ## ## ---------------- ## # We heavily use m4's diversions both for the initializations and for # required macros (see AC_REQUIRE), because in both cases we have to # issue high in `configure' something which is discovered late. # # KILL is only used to suppress output. # # The layers of `configure'. We let m4 undivert them by itself, when # it reaches the end of `configure.in'. # # - BINSH # AC_REQUIRE'd #! /bin/sh line # - REVISION # Sent by AC_REVISION # - NOTICE # copyright notice(s) # - DEFAULTS # early initializations (defaults) # - PARSE_ARGS # initialization code, option handling loop. # # - HELP_BEGIN # Handling `configure --help'. # - HELP_CANON # Help msg for AC_CANONICAL_* # - HELP_ENABLE # Help msg from AC_ARG_ENABLE. # - HELP_WITH # Help msg from AC_ARG_WITH. # - HELP_VAR # Help msg from AC_ARG_VAR. # - HELP_VAR_END # A small paragraph on the use of the variables. # - HELP_END # Tail of the handling of --help. # # - VERSION_BEGIN # Copyright notice for --version. # - VERSION_END # Tail of the handling of --version. # # - INIT_PREPARE # Tail of initialization code. # # - BODY # the tests and output code # # # This diversion is used by the AC_DEFUN/AC_REQUIRE machinery. It is # important to keep room before PREPARE because for each nested # AC_REQUIRE we use an additional diversion (i.e., two AC_REQUIREs # will use PREPARE - 2. More than 3 levels has never seemed to be # needed.) # # ... # - PREPARE - 2 # AC_REQUIRE'd code, 2 level deep # - PREPARE - 1 # AC_REQUIRE'd code, 1 level deep # - PREPARE # AC_DEFUN'd macros are elaborated here. # _AC_DIVERT(DIVERSION-NAME) # -------------------------- # Convert a diversion name into its number. Otherwise, return # DIVERSION-NAME which is supposed to be an actual diversion number. # Of course it would be nicer to use m4_case here, instead of zillions # of little macros, but it then takes twice longer to run `autoconf'! define([_AC_DIVERT(KILL)], -1) define([_AC_DIVERT(BINSH)], 0) define([_AC_DIVERT(REVISION)], 1) define([_AC_DIVERT(NOTICE)], 2) define([_AC_DIVERT(DEFAULTS)], 3) define([_AC_DIVERT(PARSE_ARGS)], 4) define([_AC_DIVERT(HELP_BEGIN)], 10) define([_AC_DIVERT(HELP_CANON)], 11) define([_AC_DIVERT(HELP_ENABLE)], 12) define([_AC_DIVERT(HELP_WITH)], 13) define([_AC_DIVERT(HELP_VAR)], 14) define([_AC_DIVERT(HELP_VAR_END)], 15) define([_AC_DIVERT(HELP_END)], 16) define([_AC_DIVERT(VERSION_BEGIN)], 20) define([_AC_DIVERT(VERSION_END)], 21) define([_AC_DIVERT(INIT_PREPARE)], 30) define([_AC_DIVERT(BODY)], 40) define([_AC_DIVERT(PREPARE)], 100) define([_AC_DIVERT], [ifdef([_AC_DIVERT($1)], [indir([_AC_DIVERT($1)])], [$1])]) # AC_DIVERT_PUSH(DIVERSION-NAME) # ------------------------------ # Change the diversion stream to DIVERSION-NAME, while stacking old values. define([AC_DIVERT_PUSH], [pushdef([_AC_DIVERT_DIVERSION], _AC_DIVERT([$1]))dnl divert(_AC_DIVERT_DIVERSION)dnl ]) # AC_DIVERT_POP # ------------- # Change the diversion stream to its previous value, unstacking it. define([AC_DIVERT_POP], [popdef([_AC_DIVERT_DIVERSION])dnl ifndef([_AC_DIVERT_DIVERSION], [AC_FATAL([too many AC_DIVERT_POP])])dnl divert(_AC_DIVERT_DIVERSION)dnl ]) # AC_DIVERT(DIVERSION-NAME, CONTENT) # ---------------------------------- # Output CONTENT into DIVERSION-NAME (which may be a number actually). # An end of line is appended for free to CONTENT. define([AC_DIVERT], [AC_DIVERT_PUSH([$1])dnl $2 AC_DIVERT_POP()dnl ]) # AC_DIVERT_ONCE(DIVERSION-NAME, CONTENT) # --------------------------------------- # Output once CONTENT into DIVERSION-NAME (which may be a number # actually). An end of line is appended for free to CONTENT. define([AC_DIVERT_ONCE], [AC_EXPAND_ONCE([AC_DIVERT([$1], [$2])])]) # Initialize the diversion setup. define([_AC_DIVERT_DIVERSION], _AC_DIVERT([BODY])) # Throw away output until AC_INIT is called. pushdef([_AC_DIVERT_DIVERSION], _AC_DIVERT([KILL])) ## ------------------------------- ## ## Defining macros in autoconf::. ## ## ------------------------------- ## # `AC_DEFUN' is basically `define' but it equips the macro with the # needed machinery for `AC_REQUIRE'. A macro must be AC_DEFUN'd if # either it is AC_REQUIRE'd, or it AC_REQUIRE's. # # Of course AC_DEFUN AC_PROVIDE's the macro, so that a macro which has # been expanded is not expanded again when AC_REQUIRE'd, but the # difficult part is the proper expansion of macros when they are # AC_REQUIRE'd. # # The implementation is based on two ideas, (i) using diversions to # prepare the expansion of the macro and its dependencies (by François # Pinard), and (ii) expand the most recently AC_REQUIRE'd macros _after_ # the previous macros (by Axel Thimm). # # # The first idea: why using diversions? # ------------------------------------- # # When a macro requires another, the other macro is expanded in new # diversion, PREPARE. When the outer macro is fully expanded, we first # undivert the most nested diversions (PREPARE - 1...), and finally # undivert PREPARE. To understand why we need several diversions, # consider the following example: # # | AC_DEFUN([TEST1], [Test...REQUIRE([TEST2])1]) # | AC_DEFUN([TEST2], [Test...REQUIRE([TEST3])2]) # | AC_DEFUN([TEST3], [Test...3]) # # Because AC_REQUIRE is not required to be first in the outer macros, we # must keep the expansions of the various level of AC_REQUIRE separated. # Right before executing the epilogue of TEST1, we have: # # PREPARE - 2: Test...3 # PREPARE - 1: Test...2 # PREPARE: Test...1 # BODY: # # Finally the epilogue of TEST1 undiverts PREPARE - 2, PREPARE - 1, and # PREPARE into the regular flow, BODY. # # PREPARE - 2: # PREPARE - 1: # PREPARE: # BODY: Test...3; Test...2; Test...1 # # (The semicolons are here for clarification, but of course are not # emitted.) This is what Autoconf 2.0 (I think) to 2.13 (I'm sure) # implement. # # # The second idea: first required first out # ----------------------------------------- # # The natural implementation of the idea above is buggy and produces # very surprising results in some situations. Let's consider the # following example to explain the bug: # # | AC_DEFUN([TEST1], [REQUIRE([TEST2a])REQUIRE([TEST2b])]) # | AC_DEFUN([TEST2a], []) # | AC_DEFUN([TEST2b], [REQUIRE([TEST3])]) # | AC_DEFUN([TEST3], [REQUIRE([TEST2a])]) # | # | AC_INIT # | TEST1 # # The dependencies between the macros are: # # 3 --- 2b # / \ is AC_REQUIRE'd by # / \ left -------------------- right # 2a ------------ 1 # # If you strictly apply the rules given in the previous section you get: # # PREPARE - 2: TEST3 # PREPARE - 1: TEST2a; TEST2b # PREPARE: TEST1 # BODY: # # (TEST2a, although required by TEST3 is not expanded in PREPARE - 3 # because is has already been expanded before in PREPARE - 1, so it has # been AC_PROVIDE'd, so it is not expanded again) so when you undivert # the stack of diversions, you get: # # PREPARE - 2: # PREPARE - 1: # PREPARE: # BODY: TEST3; TEST2a; TEST2b; TEST1 # # i.e., TEST2a is expanded after TEST3 although the latter required the # former. # # Starting from 2.50, uses an implementation provided by Axel Thimm. # The idea is simple: the order in which macros are emitted must be the # same as the one in which macro are expanded. (The bug above can # indeed be described as: a macro has been AC_PROVIDE'd, but it is # emitted after: the lack of correlation between emission and expansion # order is guilty). # # How to do that? You keeping the stack of diversions to elaborate the # macros, but each time a macro is fully expanded, emit it immediately. # # In the example above, when TEST2a is expanded, but it's epilogue is # not run yet, you have: # # PREPARE - 2: # PREPARE - 1: TEST2a # PREPARE: Elaboration of TEST1 # BODY: # # The epilogue of TEST2a emits it immediately: # # PREPARE - 2: # PREPARE - 1: # PREPARE: Elaboration of TEST1 # BODY: TEST2a # # TEST2b then requires TEST3, so right before the epilogue of TEST3, you # have: # # PREPARE - 2: TEST3 # PREPARE - 1: Elaboration of TEST2b # PREPARE: Elaboration of TEST1 # BODY: TEST2a # # The epilogue of TEST3 emits it: # # PREPARE - 2: # PREPARE - 1: Elaboration of TEST2b # PREPARE: Elaboration of TEST1 # BODY: TEST2a; TEST3 # # TEST2b is now completely expanded, and emitted: # # PREPARE - 2: # PREPARE - 1: # PREPARE: Elaboration of TEST1 # BODY: TEST2a; TEST3; TEST2b # # and finally, TEST1 is finished and emitted: # # PREPARE - 2: # PREPARE - 1: # PREPARE: # BODY: TEST2a; TEST3; TEST2b: TEST1 # # The idea, is simple, but the implementation is a bit evolved. If you # are like me, you will want to see the actual functioning of this # implementation to be convinced. The next section gives the full # details. # # # The Axel Thimm implementation at work # ------------------------------------- # # We consider the macros above, and this configure.in: # # AC_INIT # TEST1 # # You should keep the definitions of _AC_DEFUN_PRO, _AC_DEFUN_EPI, and # AC_REQUIRE at hand to follow the steps. # # This implements tries not to assume that of the current diversion is # BODY, so as soon as a macro (AC_DEFUN'd) is expanded, we first # record the current diversion under the name _AC_DIVERT_DUMP (denoted # DUMP below for short). This introduces an important difference with # the previous versions of Autoconf: you cannot use AC_REQUIRE if you # were not inside an AC_DEFUN'd macro, and especially, you cannot # AC_REQUIRE directly from the top level. # # We have not tried to simulate the old behavior (better yet, we # diagnose it), because it is too dangerous: a macro AC_REQUIRE'd from # the top level is expanded before the body of `configure', i.e., before # any other test was run. I let you imagine the result of requiring # AC_STDC_HEADERS for instance, before AC_PROG_CC was actually run.... # # After AC_INIT was run, the current diversion is BODY. # * AC_INIT was run # DUMP: undefined # diversion stack: BODY |- # # * TEST1 is expanded # The prologue of TEST1 sets AC_DIVERSION_DUMP, which is the diversion # where the current elaboration will be dumped, to the current # diversion. It also AC_DIVERT_PUSH to PREPARE, where the full # expansion of TEST1 and its dependencies will be elaborated. # DUMP: BODY # BODY: empty # diversions: PREPARE, BODY |- # # * TEST1 requires TEST2a: prologue # AC_REQUIRE AC_DIVERT_PUSHes another temporary diversion PREPARE - 1 (in # fact, the diversion whose number is one less than the current # diversion), and expands TEST2a in there. # DUMP: BODY # BODY: empty # diversions: PREPARE-1, PREPARE, BODY |- # # * TEST2a is expanded. # Its prologue pushes the current diversion again. # DUMP: BODY # BODY: empty # diversions: PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # It is expanded in PREPARE - 1, and PREPARE - 1 is popped by the epilogue # of TEST2a. # DUMP: BODY # BODY: nothing # PREPARE - 1: TEST2a # diversions: PREPARE - 1, PREPARE, BODY |- # # * TEST1 requires TEST2a: epilogue # The content of the current diversion is appended to DUMP (and removed # from the current diversion). A diversion is popped. # DUMP: BODY # BODY: TEST2a # diversions: PREPARE, BODY |- # # * TEST1 requires TEST2b: prologue # AC_REQUIRE pushes PREPARE - 1 and expands TEST2b. # DUMP: BODY # BODY: TEST2a # diversions: PREPARE - 1, PREPARE, BODY |- # # * TEST2b is expanded. # Its prologue pushes the current diversion again. # DUMP: BODY # BODY: TEST2a # diversions: PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # The body is expanded here. # # * TEST2b requires TEST3: prologue # AC_REQUIRE pushes PREPARE - 2 and expands TEST3. # DUMP: BODY # BODY: TEST2a # diversions: PREPARE - 2, PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # # * TEST3 is expanded. # Its prologue pushes the current diversion again. # DUMP: BODY # BODY: TEST2a # diversions: PREPARE-2, PREPARE-2, PREPARE-1, PREPARE-1, PREPARE, BODY |- # TEST3 requires TEST2a, but TEST2a has already been AC_PROVIDE'd, so # nothing happens. It's body is expanded here, and its epilogue pops a # diversion. # DUMP: BODY # BODY: TEST2a # PREPARE - 2: TEST3 # diversions: PREPARE - 2, PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # # * TEST2b requires TEST3: epilogue # The current diversion is appended to DUMP, and a diversion is popped. # DUMP: BODY # BODY: TEST2a; TEST3 # diversions: PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # The content of TEST2b is expanded here. # DUMP: BODY # BODY: TEST2a; TEST3 # PREPARE - 1: TEST2b, # diversions: PREPARE - 1, PREPARE - 1, PREPARE, BODY |- # The epilogue of TEST2b pops a diversion. # DUMP: BODY # BODY: TEST2a; TEST3 # PREPARE - 1: TEST2b, # diversions: PREPARE - 1, PREPARE, BODY |- # # * TEST1 requires TEST2b: epilogue # The current diversion is appended to DUMP, and a diversion is popped. # DUMP: BODY # BODY: TEST2a; TEST3; TEST2b # diversions: PREPARE, BODY |- # # * TEST1 is expanded: epilogue # TEST1's own content is in PREPARE, and it's epilogue pops a diversion. # DUMP: BODY # BODY: TEST2a; TEST3; TEST2b # PREPARE: TEST1 # diversions: BODY |- # Here, the epilogue of TEST1 notices the elaboration is done because # DUMP and the current diversion are the same, it then undiverts # PREPARE by hand, and undefines DUMP. # DUMP: undefined # BODY: TEST2a; TEST3; TEST2b; TEST1 # diversions: BODY |- # _AC_DEFUN_PRO(MACRO-NAME) # ------------------------- # The prologue for Autoconf macros. define([_AC_DEFUN_PRO], [AC_PROVIDE([$1])dnl ifdef([_AC_DIVERT_DUMP], [AC_DIVERT_PUSH(defn([_AC_DIVERT_DIVERSION]))], [define([_AC_DIVERT_DUMP], defn([_AC_DIVERT_DIVERSION]))dnl AC_DIVERT_PUSH([PREPARE])])dnl ]) # _AC_DEFUN_EPI(MACRO-NAME) # ------------------------- # The Epilogue for Autoconf macros. MACRO-NAME only helps tracing # the PRO/EPI pairs. define([_AC_DEFUN_EPI], [AC_DIVERT_POP()dnl ifelse(_AC_DIVERT_DUMP, _AC_DIVERT_DIVERSION, [undivert(_AC_DIVERT([PREPARE]))dnl undefine([_AC_DIVERT_DUMP])])dnl ]) # AC_DEFUN(NAME, EXPANSION) # ------------------------- # # Define a macro which automatically provides itself. Add machinery # so the macro automatically switches expansion to the diversion # stack if it is not already using it. In this case, once finished, # it will bring back all the code accumulated in the diversion stack. # This, combined with AC_REQUIRE, achieves the topological ordering of # macros. We don't use this macro to define some frequently called # macros that are not involved in ordering constraints, to save m4 # processing. define([AC_DEFUN], [define([$1], [_AC_DEFUN_PRO([$1])$2[]_AC_DEFUN_EPI([$1])])]) # AC_DEFUN_ONCE(NAME, EXPANSION) # ------------------------------ # As AC_DEFUN, but issues the EXPANSION only once, and warns if used # several times. define([AC_DEFUN_ONCE], [define([$1], [AC_PROVIDE_IFELSE([$1], [AC_DIAGNOSE([syntax], [$1 invoked multiple times])], [_AC_DEFUN_PRO([$1])$2[]_AC_DEFUN_EPI([$1])])])]) # AC_OBSOLETE(THIS-MACRO-NAME, [SUGGESTION]) # ------------------------------------------ define([AC_OBSOLETE], [AC_DIAGNOSE([obsolete], [$1 is obsolete$2])]) ## ----------------------------- ## ## Dependencies between macros. ## ## ----------------------------- ## # AC_BEFORE(THIS-MACRO-NAME, CALLED-MACRO-NAME) # --------------------------------------------- define([AC_BEFORE], [AC_PROVIDE_IFELSE([$2], [AC_DIAGNOSE([syntax], [$2 was called before $1])])]) # AC_REQUIRE(MACRO-NAME) # ---------------------- # If MACRO-NAME has never been expanded, expand it *before* the current # macro expansion. Once expanded, emit it in _AC_DIVERT_DUMP. define([AC_REQUIRE], [ifndef([_AC_DIVERT_DUMP], [AC_FATAL([$0: cannot be used outside of an AC_DEFUN'd macro])])dnl AC_PROVIDE_IFELSE([$1], [], [AC_DIVERT_PUSH(m4_eval(_AC_DIVERT_DIVERSION - 1))dnl $1 divert(_AC_DIVERT_DUMP)undivert(_AC_DIVERT_DIVERSION)dnl AC_DIVERT_POP()])dnl AC_PROVIDE_IFELSE([$1], [], [AC_DIAGNOSE([syntax], [$1 is AC_REQUIRE'd but is not AC_DEFUN'd])])dnl ]) # AC_EXPAND_ONCE(TEXT) # -------------------- # If TEXT has never been expanded, expand it *here*. define([AC_EXPAND_ONCE], [AC_PROVIDE_IFELSE([$1], [], [AC_PROVIDE([$1])[]$1])]) # AC_PROVIDE(MACRO-NAME) # ---------------------- define([AC_PROVIDE], [define([AC_PROVIDE_$1])]) # AC_PROVIDE_IFELSE(MACRO-NAME, IF-PROVIDED, IF-NOT-PROVIDED) # ----------------------------------------------------------- # If MACRO-NAME is provided do IF-PROVIDED, else IF-NOT-PROVIDED. # The purpose of this macro is to provide the user with a means to # check macros which are provided without letting her know how the # information is coded. define([AC_PROVIDE_IFELSE], [ifdef([AC_PROVIDE_$1], [$2], [$3])]) ## --------------------------------- ## ## Defining macros in autoupdate::. ## ## --------------------------------- ## # AU_DEFINE(NAME, GLUE-CODE, [MESSAGE]) # ------------------------------------- # # Declare `autoupdate::NAME' to be `GLUE-CODE', with all the needed # wrapping actions required by `autoupdate'. # We do not define anything in `autoconf::'. define([AU_DEFINE], [AC_DEFUN([$1], [$2])]) # AU_DEFUN(NAME, NEW-CODE, [MESSAGE]) # ----------------------------------- # Declare that the macro NAME is now obsoleted, and should be replaced # by NEW-CODE. Tell the user she should run autoupdate, and include # the additional MESSAGE. # # Also define NAME as a macro which code is NEW-CODE. # # This allows to share the same code for both supporting obsoleted macros, # and to update a configure.in. # See `acobsolete.m4' for a longer description. define([AU_DEFUN], [AU_DEFINE([$1], [AC_DIAGNOSE([obsolete], [The macro `$1' is obsolete. You should run autoupdate.])dnl $2], [$3])dnl ]) # AU_ALIAS(OLD-NAME, NEW-NAME) # ---------------------------- # The OLD-NAME is no longer used, just use NEW-NAME instead. There is # little difference with using AU_DEFUN but the fact there is little # interest in running the test suite on both OLD-NAME and NEW-NAME. # This macro makes it possible to distinguish such cases. define([AU_ALIAS], [AU_DEFUN([$1], defn([$2]))]) ## ------------------------- ## ## Interface to autoheader. ## ## ------------------------- ## # AH_OUTPUT(KEY, TEXT) # -------------------- # Pass TEXT to autoheader. # This macro is `read' only via `autoconf --trace', it outputs nothing. define([AH_OUTPUT], []) # AH_VERBATIM(KEY, TEMPLATE) # -------------------------- # If KEY is direct (i.e., no indirection such as in KEY=$my_func which # may occur if there is AC_CHECK_FUNCS($my_func)), issue an autoheader # TEMPLATE associated to the KEY. Otherwise, do nothing. TEMPLATE is # output as is, with no formating. define([AH_VERBATIM], [AC_VAR_IF_INDIR([$1],, [AH_OUTPUT([$1], _AC_SH_QUOTE([[$2]]))]) ]) # AH_TEMPLATE(KEY, DESCRIPTION) # ----------------------------- # Issue an autoheader template for KEY, i.e., a comment composed of # DESCRIPTION (properly wrapped), and then #undef KEY. define([AH_TEMPLATE], [AH_VERBATIM([$1], m4_wrap([$2 */], [ ], [/* ])[ #undef $1])]) # AH_TOP(TEXT) # ------------ # Output TEXT at the top of `config.h.in'. define([AH_TOP], [define([_AH_COUNTER], incr(_AH_COUNTER))dnl AH_VERBATIM([0000]_AH_COUNTER, [$1])]) # AH_BOTTOM(TEXT) # --------------- # Output TEXT at the bottom of `config.h.in'. define([AH_BOTTOM], [define([_AH_COUNTER], incr(_AH_COUNTER))dnl AH_VERBATIM([zzzz]_AH_COUNTER, [$1])]) # Initialize. define([_AH_COUNTER], [0]) ## --------------------- ## ## Some /bin/sh idioms. ## ## --------------------- ## # AC_SHELL_IFELSE(TEST, [IF-TRUE], [IF-FALSE]) # -------------------------------------------- # Expand into # | if TEST; then # | IF-TRUE # | else # | IF-FALSE # | fi # with simplifications is IF-TRUE and/or IF-FALSE is empty. define([AC_SHELL_IFELSE], [ifval([$2$3], [if $1; then ifval([$2], [$2], :) ifval([$3], [else $3 ])dnl fi ])dnl ])# AC_SHELL_IFELSE # _AC_SHELL_TMPDIR(PREFIX) # ------------------------ # Create as safely as possible a temporary directory which name is # inspired by PREFIX (should be 2-4 chars max), and set trap # mechanisms to remove it. define([_AC_SHELL_TMPDIR], [# Create a temporary directory, and hook for its removal unless debugging. $debug || { trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0 trap 'exit $?' 1 2 13 15 } # Create a (secure) tmp directory for tmp files. : ${TMPDIR=/tmp} { tmp=`(umask 077 && mktemp -d -q "$TMPDIR/$1XXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" } || { tmp=$TMPDIR/$1$$-$RANDOM && (umask 077 && mkdir $tmp) } || { echo "$me: cannot create a temporary directory in $TMPDIR" >&2 exit 1; }dnl ])# _AC_SHELL_TMPDIR # AC_SHELL_UNSETENV(VAR, [VALUE-IF-UNSET-NOT-SUPPORTED = `']) # ----------------------------------------------------------- # Try to unset the env VAR, otherwise set it to # VALUE-IF-UNSET-NOT-SUPPORTED. `ac_unset' must have been computed. define([AC_SHELL_UNSET], [$ac_unset $1 || test "${$1+set}" != set || $1=$2 && export $1]) # AC_SHELL_MKDIR_P(PATH) # ------------------------ # Emulate `mkdir -p' with plain `mkdir'. define([AC_SHELL_MKDIR_P], [{ case $1 in [[\\/]]* | ?:[[\\/]]* ) ac_incr_dir=;; *) ac_incr_dir=.;; esac ac_dummy="$1" for ac_mkdir_dir in `IFS=/; set X $ac_dummy; shift; echo "$[@]"`; do ac_incr_dir=$ac_incr_dir/$ac_mkdir_dir test -d $ac_incr_dir || mkdir $ac_incr_dir done; } ])# AC_SHELL_MKDIR_P # _AC_SHELL_DIRNAME(PATHNAME) # --------------------------- # Simulate running `dirname(1)' on PATHNAME, not all systems have it. # This macro must be usable from inside ` `. # # Paul Eggert answers: # Question: Under UN*X, should `//1' give `/'? # # No, under some older flavors of Unix, leading // is a special path # name: it refers to a "super-root" and is used to access other # machines' files. Leading ///, ////, etc. are equivalent to /; but # leading // is special. I think this tradition started with Apollo # Domain/OS, an OS that is still in use on some older hosts. # # POSIX.2 allows but does not require the special treatment for //. # It says that the behavior of dirname on path names of the form # //([^/]+/*)? is implementation defined. In these cases, GNU dirname # returns /, but it's more portable to return // as this works even on # those older flavors of Unix. # # I have heard rumors that this special treatment of // may be dropped # in future versions of POSIX, but for now it's still the standard. define([_AC_SHELL_DIRNAME], [expr X$1 : 'X\(.*[[^/]]\)//*[[^/][^/]]*/*$' \| \ X$1 : 'X\(//\)[[^/]]' \| \ X$1 : 'X\(//\)$' \| \ X$1 : 'X\(/\)' \| \ . : '\(.\)']) ## --------------------------------------------------- ## ## Common m4/sh handling of variables (indirections). ## ## --------------------------------------------------- ## # The purpose of this section is to provide a uniform API for # reading/setting sh variables with or without indirection. # Typically, one can write # AC_VAR_SET(var, val) # or # AC_VAR_SET(ac_$var, val) # and expect the right thing to happen. # AC_VAR_IF_INDIR(EXPRESSION, IF-INDIR, IF-NOT-INDIR) # --------------------------------------------------- # If EXPRESSION has shell indirections ($var or `expr`), expand # IF-INDIR, else IF-NOT-INDIR. define([AC_VAR_IF_INDIR], [ifelse(regexp([$1], [[`$]]), -1, [$3], [$2])]) # AC_VAR_SET(VARIABLE, VALUE) # --------------------------- # Set the VALUE of the shell VARIABLE. # If the variable contains indirections (e.g. `ac_cv_func_$ac_func') # perform whenever possible at m4 level, otherwise sh level. define([AC_VAR_SET], [AC_VAR_IF_INDIR([$1], [eval "$1=$2"], [$1=$2])]) # AC_VAR_GET(VARIABLE) # -------------------- # Get the value of the shell VARIABLE. # Evaluates to $VARIABLE if there are no indirection in VARIABLE, # else into the appropriate `eval' sequence. define([AC_VAR_GET], [AC_VAR_IF_INDIR([$1], [`eval echo '${'patsubst($1, [[\\`]], [\\\&])'}'`], [$[]$1])]) # AC_VAR_TEST_SET(VARIABLE) # ------------------------- # Expands into the `test' expression which is true if VARIABLE # is set. 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AC_DEFUN([AC_VALIDATE_CACHED_SYSTEM_TUPLE], [AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl AC_MSG_CHECKING([cached system tuple]) if { test x"${ac_cv_host_system_type+set}" = x"set" && test x"$ac_cv_host_system_type" != x"$host"; } || { test x"${ac_cv_build_system_type+set}" = x"set" && test x"$ac_cv_build_system_type" != x"$build"; } || { test x"${ac_cv_target_system_type+set}" = x"set" && test x"$ac_cv_target_system_type" != x"$target"; }; then AC_MSG_RESULT([different]) m4_default([$1], [AC_MSG_ERROR([remove config.cache and re-run configure])]) else AC_MSG_RESULT(ok) fi ac_cv_host_system_type=$host ac_cv_build_system_type=$build ac_cv_target_system_type=$target[]dnl ]) ## ---------------------- ## ## Caching test results. ## ## ---------------------- ## # AC_SITE_LOAD # ------------ # Look for site or system specific initialization scripts. define([AC_SITE_LOAD], [# Prefer explicitly selected file to automatically selected ones. if test -z "$CONFIG_SITE"; then if test "x$prefix" != xNONE; then CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site" else CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site" fi fi for ac_site_file in $CONFIG_SITE; do if test -r "$ac_site_file"; then echo "loading site script $ac_site_file" . "$ac_site_file" fi done ]) # AC_CACHE_LOAD # ------------- define([AC_CACHE_LOAD], [if test -r "$cache_file"; then # Some versions of bash will fail to source /dev/null (special # files actually), so we avoid doing that. if test -f "$cache_file"; then echo "loading cache $cache_file" case $cache_file in [[\\/]]* | ?:[[\\/]]* ) . $cache_file;; *) . ./$cache_file;; esac fi else echo "creating cache $cache_file" >$cache_file fi ])# AC_CACHE_LOAD # _AC_CACHE_DUMP # -------------- # Dump the cache to stdout. It can be in a pipe (this is a requirement). define([_AC_CACHE_DUMP], [# The following way of writing the cache mishandles newlines in values, # but we know of no workaround that is simple, portable, and efficient. # So, don't put newlines in cache variables' values. # Ultrix sh set writes to stderr and can't be redirected directly, # and sets the high bit in the cache file unless we assign to the vars. { (set) 2>&1 | case `(ac_space=' '; set | grep ac_space) 2>&1` in *ac_space=\ *) # `set' does not quote correctly, so add quotes (double-quote substitution # turns \\\\ into \\, and sed turns \\ into \). sed -n \ -e "s/'/'\\\\''/g" \ -e ["s/^\\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\\)=\\(.*\\)/\\1='\\2'/p"] ;; *) # `set' quotes correctly as required by POSIX, so do not add quotes. sed -n '[s/^\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\)=\(.*\)/\1=\2/p]' ;; esac; }dnl ])# _AC_CACHE_DUMP # AC_CACHE_SAVE # ------------- # Save the cache. # Allow a site initialization script to override cache values. define([AC_CACHE_SAVE], [cat >confcache <<\EOF # This file is a shell script that caches the results of configure # tests run on this system so they can be shared between configure # scripts and configure runs, see configure's option --config-cache. # It is not useful on other systems. If it contains results you don't # want to keep, you may remove or edit it. # # config.status only pays attention to the cache file if you give it # the --recheck option to rerun configure. # # `ac_cv_env_foo' variables (set or unset) will be overriden when # loading this file, other *unset* `ac_cv_foo' will be assigned the # following values. EOF _AC_CACHE_DUMP() | sed '/^ac_cv_env/!s/^\([[^=]]*\)=\(.*\)$/\1=${\1=\2}/' >>confcache if cmp -s $cache_file confcache; then :; else if test -w $cache_file; then test "x$cache_file" != "x/dev/null" && echo "updating cache $cache_file" cat confcache >$cache_file else echo "not updating unwritable cache $cache_file" fi fi rm -f confcache[]dnl ])# AC_CACHE_SAVE # AC_CACHE_VAL(CACHE-ID, COMMANDS-TO-SET-IT) # ------------------------------------------ # The name of shell var CACHE-ID must contain `_cv_' in order to get saved. # Should be dnl'ed. Try to catch common mistakes. define([AC_CACHE_VAL], [ifelse(regexp([$2], [AC_DEFINE]), [-1], [], [AC_DIAGNOSE(syntax, [$0($1, ...): suspicious presence of an AC_DEFINE in the second argument, ]dnl [where no actions should be taken])])dnl AC_VAR_IF_SET([$1], [echo $ECHO_N "(cached) $ECHO_C" >&AC_FD_MSG], [$2])]) # AC_CACHE_CHECK(MESSAGE, CACHE-ID, COMMANDS) # ------------------------------------------- # Do not call this macro with a dnl right behind. define([AC_CACHE_CHECK], [AC_MSG_CHECKING([$1]) AC_CACHE_VAL([$2], [$3])dnl AC_MSG_RESULT_UNQUOTED(AC_VAR_GET([$2]))]) ## ---------------------- ## ## Defining CPP symbols. ## ## ---------------------- ## # AC_DEFINE(VARIABLE, [VALUE], [DESCRIPTION]) # ------------------------------------------- # Set VARIABLE to VALUE, verbatim, or 1. Remember the value # and if VARIABLE is affected the same VALUE, do nothing, else # die. The third argument is used by autoheader. define([AC_DEFINE], [ifval([$3], [AH_TEMPLATE([$1], [$3])])dnl cat >>confdefs.h <<\EOF [#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1) EOF ]) # AC_DEFINE_UNQUOTED(VARIABLE, [VALUE], [DESCRIPTION]) # ---------------------------------------------------- # Similar, but perform shell substitutions $ ` \ once on VALUE. define([AC_DEFINE_UNQUOTED], [ifval([$3], [AH_TEMPLATE([$1], [$3])])dnl cat >>confdefs.h <&m4_default([$2], [AC_FD_MSG])]) # _AC_ECHO(STRING, [FD = AC_FD_MSG]) # ---------------------------------- # Protect STRING from backquote expansion, echo the result to FD. define([_AC_ECHO], [_AC_ECHO_UNQUOTED([_AC_SH_QUOTE([$1])], $2)]) # _AC_ECHO_N(STRING, [FD = AC_FD_MSG]) # ------------------------------------ # Same as _AC_ECHO, but echo doesn't return to a new line. define([_AC_ECHO_N], [echo $ECHO_N "_AC_SH_QUOTE([$1])$ECHO_C" >&m4_default([$2], [AC_FD_MSG])]) # AC_MSG_CHECKING(FEATURE) # ------------------------ define([AC_MSG_CHECKING], [_AC_ECHO([configure:__oline__: checking $1], AC_FD_LOG) _AC_ECHO_N([checking $1... ])[]dnl ]) # autoupdate::AC_CHECKING(FEATURE) # -------------------------------- AU_DEFUN([AC_CHECKING], [AC_MSG_CHECKING([$1])]) # AC_MSG_RESULT(RESULT) # --------------------- define([AC_MSG_RESULT], [_AC_ECHO([configure:__oline__: result: $1], AC_FD_LOG) _AC_ECHO([${ECHO_T}$1])[]dnl ]) # AC_MSG_RESULT_UNQUOTED(RESULT) # ------------------------------ # Likewise, but perform $ ` \ shell substitutions. define([AC_MSG_RESULT_UNQUOTED], [_AC_ECHO_UNQUOTED([configure:__oline__: result: $1], AC_FD_LOG) _AC_ECHO_UNQUOTED([${ECHO_T}$1])[]dnl ]) # autoupdate::AC_VERBOSE(RESULT) # ------------------------------ AU_DEFUN([AC_VERBOSE], [AC_MSG_RESULT([ $1])]) # AC_MSG_WARN(PROBLEM) # -------------------- define([AC_MSG_WARN], [_AC_ECHO([configure: WARNING: $1], 2)]) # AC_MSG_ERROR(ERROR, [EXIT-STATUS = 1]) # -------------------------------------- define([AC_MSG_ERROR], [{ _AC_ECHO([configure: error: $1], 2); exit m4_default([$2], 1); }]) ## ---------------------------- ## ## Compiler-running mechanics. ## ## ---------------------------- ## # AC_TRY_EVAL(VARIABLE) # --------------------- # The purpose of this macro is to "configure:123: command line" # written into config.log for every test run. AC_DEFUN([AC_TRY_EVAL], [{ (eval echo configure:__oline__: \"[$]$1\") >&AC_FD_LOG; dnl (eval [$]$1) 2>&AC_FD_LOG; }]) # AC_TRY_COMMAND(COMMAND) # ----------------------- AC_DEFUN([AC_TRY_COMMAND], [{ ac_try='$1'; AC_TRY_EVAL(ac_try); }]) ## ------------------ ## ## Default includes. ## ## ------------------ ## # Always use the same set of default headers for all the generic # macros. It is easier to document, to extend, and to understand than # having specific defaults for each macro. # Of course, one would like to issue these default headers only if # they were used, i.e.., AC_INCLUDES_DEFAULT was called, and the # default `branch' was run. Unfortunately AC_INCLUDES_DEFAULT is # called unquoted, so it is unsafe to try to divert from there. # Therefore, the following *is* buggy, but this is the kind of # tradeoff we accept in order to improve configure. # See _AC_INIT_PREPARE to see the value of `ac_includes_default'. # AC_INCLUDES_DEFAULT([INCLUDES]) # ------------------------------- # If INCLUDES is empty, expand in default includes, otherwise in # INCLUDES. # # The end-of-line after `$[1]' below is meant, and it is actually # because this new line is meant that we don't use m4_default. The # problem is that this macro is used *unquoted* in AC_TRY_COMPILE # etc. It is used unquoted because unfortunately (this is a real # pain), AC_TRY_COMPILE is over quoting some of its arguments. This # is a sad decision. # # Still, there are calls such as this # # AC_TRY_COMPILE(AC_INCLUDES_DEFAULT([#include ]), # AC_BLAH_BLAH..) # # Because AC_INCLUDES_DEFAULT *has* to be unquoted, after evaluation, # if there were no end of line, you'd get # # AC_TRY_COMPILE(#include , # AC_BLAH_BLAH, # AC_MORE_BLAH_BLAH) # # i.e. the first argument given to AC_TRY_COMPILE is # # #include , # AC_BLAH_BLAH # # (note how the comma was swallowed because of the comment mark) and # the second is # # AC_MORE_BLAH_BLAH # # so all the arguments are shifted. # # Because I don't see any backward compatible means to fix the # brokenness of AC_TRY_COMPILE, we are doomed to leave a extra new # line here. define([AC_INCLUDES_DEFAULT], [ifelse([$1], [], [$ac_includes_default], [$1 ])]) ## -------------------------- ## ## Generic structure checks. ## ## -------------------------- ## # AC_CHECK_MEMBER(AGGREGATE.MEMBER, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # --------------------------------------------------------- # AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell # variables are not a valid argument. AC_DEFUN([AC_CHECK_MEMBER], [AC_VAR_IF_INDIR([$1], [AC_FATAL([$0: requires literal arguments])])dnl ifelse(regexp([$1], [\.]), -1, [AC_FATAL([$0: Did not see any dot in `$1'])])dnl AC_REQUIRE([AC_HEADER_STDC])dnl AC_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])dnl dnl Extract the aggregate name, and the member name AC_CACHE_CHECK([for $1], ac_Member, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])], [dnl AGGREGATE foo; patsubst([$1], [\..*]) foo; dnl foo.MEMBER; foo.patsubst([$1], [^[^.]*\.]);])], AC_VAR_SET(ac_Member, yes), AC_VAR_SET(ac_Member, no))]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_Member) = yes], [$2], [$3])dnl AC_VAR_POPDEF([ac_Member])dnl ])# AC_CHECK_MEMBER # AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...], # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND] # [INCLUDES]) # --------------------------------------------------------- # The first argument is an m4 list. AC_DEFUN([AC_CHECK_MEMBERS], [m4_foreach([AC_Member], [$1], [AC_CHECK_MEMBER(AC_Member, [AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_[]AC_Member), 1, [Define if `]patsubst(AC_Member, [^[^.]*\.])[' is member of `]patsubst(AC_Member, [\..*])['.]) $2], [$3], [$4])])]) ## ----------------------- ## ## Checking for programs. ## ## ----------------------- ## # AC_SHELL_PATH_WALK([PATH = $PATH], BODY) # ---------------------------------------- # Walk through PATH running BODY for each `ac_dir'. # # `$ac_dummy' forces splitting on constant user-supplied paths. # POSIX.2 word splitting is done only on the output of word # expansions, not every word. This closes a longstanding sh security # hole. define([AC_SHELL_PATH_WALK], [ac_save_IFS=$IFS; IFS=':' ac_dummy="m4_default([$1], [$PATH])" for ac_dir in $ac_dummy; do IFS=$ac_save_IFS test -z "$ac_dir" && ac_dir=. $2 done ]) # AC_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR, # [VALUE-IF-FOUND], [VALUE-IF-NOT-FOUND], # [PATH], [REJECT]) # ----------------------------------------------------- AC_DEFUN([AC_CHECK_PROG], [# Extract the first word of "$2", so it can be a program name with args. set dummy $2; ac_word=$[2] AC_MSG_CHECKING([for $ac_word]) AC_CACHE_VAL(ac_cv_prog_$1, [if test -n "$$1"; then ac_cv_prog_$1="$$1" # Let the user override the test. else ifval([$6], [ ac_prog_rejected=no ])dnl AC_SHELL_PATH_WALK([$5], [test -f $ac_dir/$ac_word || continue ifval([$6], [if test "$ac_dir/$ac_word" = "$6"; then ac_prog_rejected=yes continue fi ])dnl ac_cv_prog_$1="$3" break]) ifval([$6], [if test $ac_prog_rejected = yes; then # We found a bogon in the path, so make sure we never use it. set dummy $ac_cv_prog_$1 shift if test $[@%:@] != 0; then # We chose a different compiler from the bogus one. # However, it has the same basename, so the bogon will be chosen # first if we set $1 to just the basename; use the full file name. shift set dummy "$ac_dir/$ac_word" ${1+"$[@]"} shift ac_cv_prog_$1="$[@]" ifelse([$2], [$4], [ else # Default is a loser. AC_MSG_ERROR([$1=$6 unacceptable, but no other $4 found in dnl m4_default([$5], [\$PATH])]) ])dnl fi fi ])dnl dnl If no 4th arg is given, leave the cache variable unset, dnl so AC_CHECK_PROGS will keep looking. ifval([$4], [ test -z "$ac_cv_prog_$1" && ac_cv_prog_$1="$4" ])dnl fi])dnl $1=$ac_cv_prog_$1 if test -n "$$1"; then AC_MSG_RESULT([$$1]) else AC_MSG_RESULT([no]) fi AC_SUBST($1)dnl ])# AC_CHECK_PROG # AC_CHECK_PROGS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], # [PATH]) # ------------------------------------------------------------------ AC_DEFUN([AC_CHECK_PROGS], [for ac_prog in $2 do AC_CHECK_PROG([$1], $ac_prog, $ac_prog, , [$4]) test -n "$$1" && break done ifval([$3], [test -n "$$1" || $1="$3" ])]) # AC_PATH_PROG(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH]) # ----------------------------------------------------------------------- AC_DEFUN([AC_PATH_PROG], [# Extract the first word of "$2", so it can be a program name with args. set dummy $2; ac_word=$[2] AC_MSG_CHECKING([for $ac_word]) AC_CACHE_VAL(ac_cv_path_$1, [case $$1 in [[\\/]]* | ?:[[\\/]]*) ac_cv_path_$1="$$1" # Let the user override the test with a path. ;; *) AC_SHELL_PATH_WALK([$4], [if test -f "$ac_dir/$ac_word"; then ac_cv_path_$1=$ac_dir/$ac_word break fi]) dnl If no 3rd arg is given, leave the cache variable unset, dnl so AC_PATH_PROGS will keep looking. ifval([$3], [ test -z "$ac_cv_path_$1" && ac_cv_path_$1="$3" ])dnl ;; esac])dnl $1=$ac_cv_path_$1 if test -n "$$1"; then AC_MSG_RESULT($$1) else AC_MSG_RESULT(no) fi AC_SUBST($1)dnl ])# AC_PATH_PROG # AC_PATH_PROGS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], # [PATH]) # ----------------------------------------------------------------- AC_DEFUN([AC_PATH_PROGS], [for ac_prog in $2 do AC_PATH_PROG($1, $ac_prog, , $4) test -n "$$1" && break done ifval([$3], [test -n "$$1" || $1="$3" ])]) ## -------------------- ## ## Checking for tools. ## ## -------------------- ## # AC_CHECK_TOOL_PREFIX # -------------------- AU_DEFUN([AC_CHECK_TOOL_PREFIX]) # AC_PATH_TOOL(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH]) # ----------------------------------------------------------------------- # (Use different variables $1 and ac_pt_$1 so that cache vars don't conflict.) AC_DEFUN([AC_PATH_TOOL], [AC_PATH_PROG($1, ${ac_tool_prefix}$2, , $4) if test -z "$ac_cv_path_$1"; then if test -n "$ac_tool_prefix"; then AC_PATH_PROG([ac_pt_$1], [$2], [$3], [$4]) $1="$ac_pt_$1" else $1="$3" fi fi ]) # AC_CHECK_TOOL(VARIABLE, PROG-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH]) # ------------------------------------------------------------------------ # (Use different variables $1 and ac_ct_$1 so that cache vars don't conflict.) AC_DEFUN([AC_CHECK_TOOL], [AC_CHECK_PROG($1, ${ac_tool_prefix}$2, ${ac_tool_prefix}$2, , $4) if test -z "$ac_cv_prog_$1"; then if test -n "$ac_tool_prefix"; then AC_CHECK_PROG([ac_ct_$1], [$2], [$2], [$3], [$4]) $1="$ac_ct_$1" else $1="$3" fi fi ]) # AC_CHECK_TOOLS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], # [PATH]) # ------------------------------------------------------------------ # Check for each tool in PROGS-TO-CHECK-FOR with the cross prefix. If # none can be found with a cross prefix, then use the first one that # was found without the cross prefix. AC_DEFUN([AC_CHECK_TOOLS], [for ac_prog in $2 do AC_CHECK_PROG([$1], $ac_tool_prefix$ac_prog, $ac_tool_prefix$ac_prog,, [$4]) test "$$1" != "" && break done if test "$$1" = ""; then AC_CHECK_PROGS([$1], [$2], [$3], [$4]) fi ])# AC_CHECK_TOOLS # AC_PREFIX_PROGRAM(PROGRAM) # -------------------------- # Guess the value for the `prefix' variable by looking for # the argument program along PATH and taking its parent. # Example: if the argument is `gcc' and we find /usr/local/gnu/bin/gcc, # set `prefix' to /usr/local/gnu. # This comes too late to find a site file based on the prefix, # and it might use a cached value for the path. # No big loss, I think, since most configures don't use this macro anyway. AC_DEFUN([AC_PREFIX_PROGRAM], [dnl Get an upper case version of $[1]. pushdef(AC_Prog, translit($1, a-z, A-Z))dnl if test "x$prefix" = xNONE; then dnl We reimplement AC_MSG_CHECKING (mostly) to avoid the ... in the middle. echo $ECHO_N "checking for prefix by $ECHO_C" >&AC_FD_MSG AC_PATH_PROG(AC_Prog, $1) if test -n "$ac_cv_path_[]AC_Prog"; then prefix=`echo $ac_cv_path_[]AC_Prog | [sed 's,/[^/][^/]*//*[^/][^/]*$,,']` fi fi popdef([AC_Prog])dnl ])# AC_PREFIX_PROGRAM ## ------------------------ ## ## Checking for libraries. ## ## ------------------------ ## # AC_TRY_LINK_FUNC(FUNC, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND) # ------------------------------------------------------------ # Try to link a program that calls FUNC, handling GCC builtins. If # the link succeeds, execute ACTION-IF-FOUND; otherwise, execute # ACTION-IF-NOT-FOUND. AC_DEFUN([AC_TRY_LINK_FUNC], [AC_LINK_IFELSE([AC_LANG_CALL([], [$1])], [$2], [$3])]) # AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # -------------------------------------------------------- # Search for a library defining FUNC, if it's not already available. AC_DEFUN([AC_SEARCH_LIBS], [AC_CACHE_CHECK([for library containing $1], [ac_cv_search_$1], [ac_func_search_save_LIBS=$LIBS ac_cv_search_$1=no AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="none required"]) test "$ac_cv_search_$1" = no && for ac_lib in $2; do LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS" AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="-l$ac_lib" break]) done LIBS=$ac_func_search_save_LIBS]) AC_SHELL_IFELSE([test "$ac_cv_search_$1" != no], [test "$ac_cv_search_$1" = "none required" || LIBS="$ac_cv_search_$1 $LIBS" $3], [$4])[]dnl ]) # AC_CHECK_LIB(LIBRARY, FUNCTION, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # ------------------------------------------------------ # # Use a cache variable name containing both the library and function name, # because the test really is for library $1 defining function $2, not # just for library $1. Separate tests with the same $1 and different $2s # may have different results. # # FIXME: This macro is extremely suspicious. It DEFINEs unconditionnally, # whatever the FUNCTION, in addition to not being a *S macro. Note # that the cache does depend upon the function we are looking for. # # It is on purpose we used `ac_check_lib_save_LIBS' and not just # `ac_save_LIBS': there are many macros which don't want to see `LIBS' # changed but still want to use AC_CHECK_LIB, so they save `LIBS'. # And ``ac_save_LIBS' is too tempting a name, so let's leave them some # freedom. AC_DEFUN([AC_CHECK_LIB], [AH_CHECK_LIB([$1])dnl AC_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])dnl AC_ARG_VAR([LDFLAGS], [linker flags, e.g. -L if you have libraries in a nonstandard directory ]) AC_CACHE_CHECK([for $2 in -l$1], ac_Lib, [ac_check_lib_save_LIBS=$LIBS LIBS="-l$1 $5 $LIBS" AC_TRY_LINK_FUNC([$2], [AC_VAR_SET(ac_Lib, yes)], [AC_VAR_SET(ac_Lib, no)]) LIBS=$ac_check_lib_save_LIBS]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_Lib) = yes], [m4_default([$3], [AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_LIB$1)) LIBS="-l$1 $LIBS" ])], [$4])dnl AC_VAR_POPDEF([ac_Lib])dnl ])# AC_CHECK_LIB # AH_CHECK_LIB(LIBNAME) # --------------------- # FIXME: To be rigorous, this should not be systematic: depending # upon the arguments of AC_CHECK_LIB, we might not AC_DEFINE. define([AH_CHECK_LIB], [AH_TEMPLATE(AC_TR_CPP(HAVE_LIB$1), [Define if you have the `]$1[' library (-l]$1[).])]) # AC_HAVE_LIBRARY(LIBRARY, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # --------------------------------------------------------- # # This macro is equivalent to calling `AC_CHECK_LIB' with a FUNCTION # argument of `main'. In addition, LIBRARY can be written as any of # `foo', `-lfoo', or `libfoo.a'. In all of those cases, the compiler # is passed `-lfoo'. However, LIBRARY cannot be a shell variable; # it must be a literal name. AU_DEFUN([AC_HAVE_LIBRARY], [pushdef([AC_Lib_Name], patsubst(patsubst([[$1]], [lib\([^\.]*\)\.a], [\1]), [-l], []))dnl AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main popdef([AC_Lib_Name])dnl ]) ## ------------------------ ## ## Examining declarations. ## ## ------------------------ ## # AC_TRY_CPP(INCLUDES, [ACTION-IF-TRUE], [ACTION-IF-FALSE]) # --------------------------------------------------------- # INCLUDES are not defaulted. AC_DEFUN([AC_TRY_CPP], [AC_REQUIRE_CPP()dnl AC_LANG_CONFTEST([AC_LANG_SOURCE([[$1]])]) # Capture the stderr of cpp. eval is necessary to expand ac_cpp. We # used to copy stderr to stdout and capture it in a variable, but that # breaks under sh -x, which writes compile commands starting with ` +' # to stderr in eval and subshells. ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" AC_TRY_EVAL(ac_try) ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` if test -z "$ac_err"; then m4_default([$2], :) else echo "$ac_err" >&AC_FD_LOG echo "configure: failed program was:" >&AC_FD_LOG cat conftest.$ac_ext >&AC_FD_LOG $3 fi rm -f conftest*]) # AC_EGREP_HEADER(PATTERN, HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # -------------------------------------------------------- AC_DEFUN([AC_EGREP_HEADER], [AC_EGREP_CPP([$1], [#include <$2> ], [$3], [$4])]) # AC_EGREP_CPP(PATTERN, PROGRAM, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ------------------------------------------------------ # Because this macro is used by AC_PROG_GCC_TRADITIONAL, which must # come early, it is not included in AC_BEFORE checks. AC_DEFUN([AC_EGREP_CPP], [AC_REQUIRE_CPP()dnl AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])]) dnl eval is necessary to expand ac_cpp. dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell. if (eval "$ac_cpp conftest.$ac_ext") 2>&AC_FD_LOG | dnl Prevent m4 from eating character classes: changequote(, )dnl egrep "$1" >/dev/null 2>&1; then changequote([, ])dnl m4_default([$3], :) ifval([$4], [else $4 ])dnl fi rm -f conftest* ])# AC_EGREP_CPP ## ------------------ ## ## Examining syntax. ## ## ------------------ ## # AC_COMPILE_IFELSE(PROGRAM, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # -------------------------------------------------------------------- # Try to compile PROGRAM. AC_DEFUN([AC_COMPILE_IFELSE], [AC_LANG_CONFTEST([$1]) if AC_TRY_EVAL(ac_compile) && test -s conftest.$ac_objext; then m4_default([$2], :) else echo "configure: failed program was:" >&AC_FD_LOG cat conftest.$ac_ext >&AC_FD_LOG ifval([$3], [ $3 ])dnl fi rm -f conftest*[]dnl ])# AC_COMPILE_IFELSE # AC_TRY_COMPILE(INCLUDES, FUNCTION-BODY, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # -------------------------------------------------------- AC_DEFUN([AC_TRY_COMPILE], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$1]], [[$2]])], [$3], [$4])]) ## --------------------- ## ## Examining libraries. ## ## --------------------- ## # AC_LINK_IFELSE(PROGRAM, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ----------------------------------------------------------------- # Try to link PROGRAM. AC_DEFUN([AC_LINK_IFELSE], [AC_LANG_CONFTEST([$1]) if AC_TRY_EVAL(ac_link) && test -s conftest$ac_exeext; then m4_default([$2], :) else echo "configure: failed program was:" >&AC_FD_LOG cat conftest.$ac_ext >&AC_FD_LOG ifval([$3], [ $3 ])dnl fi rm -f conftest*[]dnl ])# AC_LINK_IFELSE # AC_TRY_LINK(INCLUDES, FUNCTION-BODY, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ----------------------------------------------------- # Should the INCLUDES be defaulted here? # Contrarily to AC_LINK_IFELSE, this macro double quote its first two args. # FIXME: WARNING: The code to compile was different in the case of # Fortran between AC_TRY_COMPILE and AC_TRY_LINK, though they should # equivalent as far as I can tell from the semantics and the docs. In # the former, $[2] is used as is, in the latter, it is `call' ed. # Remove these FIXME: once truth established. AC_DEFUN([AC_TRY_LINK], [AC_LINK_IFELSE([AC_LANG_PROGRAM([[$1]], [[$2]])], [$3], [$4])]) # AC_COMPILE_CHECK(ECHO-TEXT, INCLUDES, FUNCTION-BODY, # ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]) # -------------------------------------------------------- AU_DEFUN([AC_COMPILE_CHECK], [ifval([$1], [AC_CHECKING([for $1]) ])dnl AC_LINK_IFELSE([AC_LANG_PROGRAM([[$2]], [[$3]])], [$4], [$5]) ]) ## -------------------------------- ## ## Checking for run-time features. ## ## -------------------------------- ## # AC_RUN_IFELSE(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE]) # ----------------------------------------------------------- # Compile, link, and run. AC_DEFUN([AC_RUN_IFELSE], [AC_LANG_CONFTEST([$1]) if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null; then m4_default([$2], :) else echo "configure: failed program was:" >&AC_FD_LOG cat conftest.$ac_ext >&AC_FD_LOG ifval([$3], [ $3 ])dnl fi rm -f conftest*[]dnl ])# AC_RUN_IFELSE # AC_TRY_RUN(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE], # [ACTION-IF-CROSS-COMPILING]) # -------------------------------------------------------- AC_DEFUN([AC_TRY_RUN], [if test "$cross_compiling" = yes; then m4_default([$4], [AC_DIAGNOSE([cross], [AC_TRY_RUN called without default to allow cross compiling])dnl AC_MSG_ERROR(cannot run test program while cross compiling)]) else AC_RUN_IFELSE([AC_LANG_SOURCE([[$1]])], [$2], [$3]) fi ])# AC_TRY_RUN ## --------------------------- ## ## Checking for header files. ## ## --------------------------- ## # AC_CHECK_HEADER(HEADER-FILE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ---------------------------------------------------------------------- AC_DEFUN([AC_CHECK_HEADER], [AC_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])dnl AC_ARG_VAR([CPPFLAGS], [C/C++ preprocessor flags, e.g. -I if you have headers in a nonstandard directory ]) AC_CACHE_CHECK([for $1], ac_Header, [AC_TRY_CPP([#include <$1> ], AC_VAR_SET(ac_Header, yes), AC_VAR_SET(ac_Header, no))]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_Header) = yes], [$2], [$3])dnl AC_VAR_POPDEF([ac_Header])dnl ])# AC_CHECK_HEADER define([AH_CHECK_HEADERS], [AC_FOREACH([AC_Header], [$1], [AH_TEMPLATE(AC_TR_CPP(HAVE_[]AC_Header), [Define if you have the <]AC_Header[> header file.])])]) # AC_CHECK_HEADERS(HEADER-FILE... # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ---------------------------------------------------------- AC_DEFUN([AC_CHECK_HEADERS], [AH_CHECK_HEADERS([$1])dnl for ac_header in $1 do AC_CHECK_HEADER($ac_header, [AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_$ac_header)) $2], [$3])dnl done ]) ## ------------------------------------- ## ## Checking for the existence of files. ## ## ------------------------------------- ## # AC_CHECK_FILE(FILE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ------------------------------------------------------------- # # Check for the existence of FILE. AC_DEFUN([AC_CHECK_FILE], [AC_DIAGNOSE([cross], [Cannot check for file existence when cross compiling])dnl AC_VAR_PUSHDEF([ac_File], [ac_cv_file_$1])dnl AC_CACHE_CHECK([for $1], ac_File, [test "$cross_compiling" = yes && AC_MSG_ERROR([Cannot check for file existence when cross compiling]) if test -r "$1"; then AC_VAR_SET(ac_File, yes) else AC_VAR_SET(ac_File, no) fi]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_File) = yes], [$2], [$3])dnl AC_VAR_POPDEF([ac_File])dnl ])# AC_CHECK_FILE # AC_CHECK_FILES(FILE..., [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ----------------------------------------------------------------- AC_DEFUN([AC_CHECK_FILES], [AC_FOREACH([AC_FILE_NAME], [$1], [AC_CHECK_FILE(AC_FILE_NAME, [AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_[]AC_FILE_NAME), 1, [Define if you have the file `]AC_File['.]) $2], [$3])])]) ## ------------------------------- ## ## Checking for declared symbols. ## ## ------------------------------- ## # AC_CHECK_DECL(SYMBOL, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # ------------------------------------------------------- # Check if SYMBOL (a variable or a function) is declared. AC_DEFUN([AC_CHECK_DECL], [AC_VAR_PUSHDEF([ac_Symbol], [ac_cv_have_decl_$1])dnl AC_CACHE_CHECK([whether $1 is declared], ac_Symbol, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])], [#ifndef $1 char *p = (char *) $1; #endif ])], AC_VAR_SET(ac_Symbol, yes), AC_VAR_SET(ac_Symbol, no))]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_Symbol) = yes], [$2], [$3])dnl AC_VAR_POPDEF([ac_Symbol])dnl ])# AC_CHECK_DECL # AC_CHECK_DECLS(SYMBOLS, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # -------------------------------------------------------- # Defines HAVE_DECL_SYMBOL to 1 if declared, 0 otherwise. See the # documentation for a detailed explanation of this difference with # other AC_CHECK_*S macros. SYMBOLS is an m4 list. AC_DEFUN([AC_CHECK_DECLS], [m4_foreach([AC_Symbol], [$1], [AC_CHECK_DECL(AC_Symbol, [AC_DEFINE_UNQUOTED(AC_TR_CPP([HAVE_DECL_]AC_Symbol), 1, [Define to 1 if you have the declaration of `]AC_Symbol[', and to 0 if you don't.]) $2], [AC_DEFINE_UNQUOTED(AC_TR_CPP([HAVE_DECL_]AC_Symbol), 0) $3], [$4])]) ])# AC_CHECK_DECLS ## -------------------------------- ## ## Checking for library functions. ## ## -------------------------------- ## # AC_LIBOBJ_DECL(FILENAME-NOEXT) # ------------------------------ # Announce we might need the file `FILENAME-NOEXT.c'. define([AC_LIBOBJ_DECL], []) # _AC_LIBOBJ(FILENAME-NOEXT, ACTION-IF-INDIR) # ------------------------------------------- # We need `FILENAME-NOEXT.o', save this into `LIBOBJS'. # We don't use AC_SUBST/2 because it forces an unneeded eol. define([_AC_LIBOBJ], [AC_VAR_IF_INDIR([$1], [$2], [AC_LIBOBJ_DECL([$1])])dnl AC_SUBST([LIBOBJS])dnl LIBOBJS="$LIBOBJS $1.$ac_objext"]) # AC_LIBOBJ(FILENAME-NOEXT) # ------------------------- # We need `FILENAME-NOEXT.o', save this into `LIBOBJS'. # We don't use AC_SUBST/2 because it forces an unneeded eol. define([AC_LIBOBJ], [_AC_LIBOBJ([$1], [AC_DIAGNOSE(syntax, [$0($1): you should use literals])])dnl ]) ## ----------------------------------- ## ## Checking compiler characteristics. ## ## ----------------------------------- ## # _AC_COMPUTE_INT_COMPILE(EXPRESSION, VARIABLE, [INCLUDES]) # --------------------------------------------------------- # Compute the integer EXPRESSION and store the result in the VARIABLE. # Works OK if cross compiling. define([_AC_COMPUTE_INT_COMPILE], [# Depending upon the size, compute the lo and hi bounds. AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) >= 0])], [ac_lo=0 ac_try=0 while true; do AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) <= $ac_try])], [ac_hi=$ac_try; break], [ac_lo=`expr $ac_try + 1`; ac_try=`expr 2 '*' $ac_try + 1`]) done], [ac_hi=-1 ac_try=-1 while true; do AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) >= $ac_try])], [ac_lo=$ac_try; break], [ac_hi=`expr $ac_try - 1`; ac_try=`expr 2 '*' $ac_try`]) done]) # Binary search between lo and hi bounds. while test "x$ac_lo" != "x$ac_hi"; do ac_try=`expr '(' $ac_hi - $ac_lo ')' / 2 + $ac_lo` AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([$3], [($1) <= $ac_try])], [ac_hi=$ac_try], [ac_lo=`expr $ac_try + 1`]) done $2=$ac_lo[]dnl ])# _AC_COMPUTE_INT_COMPILE # _AC_COMPUTE_INT_RUN(EXPRESSION, VARIABLE, [INCLUDES], [IF-FAILS]) # ----------------------------------------------------------------- # Store the evaluation of the integer EXPRESSION in VARIABLE. define([_AC_COMPUTE_INT_RUN], [AC_RUN_IFELSE([AC_LANG_INT_SAVE([$3], [$1])], [$2=`cat conftestval`], [$4])]) # _AC_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS) # --------------------------------------------------------- define([_AC_COMPUTE_INT], [if test "$cross_compiling" = yes; then _AC_COMPUTE_INT_COMPILE([$1], [$2], [$3]) else _AC_COMPUTE_INT_RUN([$1], [$2], [$3], [$4]) fi[]dnl ])# _AC_COMPUTE_INT # AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES]) # -------------------------------------------- AC_DEFUN([AC_CHECK_SIZEOF], [AC_VAR_IF_INDIR([$1], [AC_FATAL([$0: requires literal arguments])])dnl AC_CHECK_TYPE([$1], [], [], [$3]) AC_CACHE_CHECK([size of $1], AC_TR_SH([ac_cv_sizeof_$1]), [if test "$AC_TR_SH([ac_cv_type_$1])" = yes; then _AC_COMPUTE_INT([sizeof ($1)], [AC_TR_SH([ac_cv_sizeof_$1])], [AC_INCLUDES_DEFAULT([$3])]) else AC_TR_SH([ac_cv_sizeof_$1])=0 fi])dnl AC_DEFINE_UNQUOTED(AC_TR_CPP(sizeof_$1), $AC_TR_SH([ac_cv_sizeof_$1]), [The size of a `$1', as computed by sizeof.]) ])# AC_CHECK_SIZEOF ## -------------------- ## ## Checking for types. ## ## -------------------- ## # Up to 2.13 included, Autoconf used to provide the macro # # AC_CHECK_TYPE(TYPE, DEFAULT) # # Since, it provides another version which fits better with the other # AC_CHECK_ families: # # AC_CHECK_TYPE(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # # In order to provide backward compatibility, the new scheme is # implemented as _AC_CHECK_TYPE_NEW, the old scheme as _AC_CHECK_TYPE_OLD, # and AC_CHECK_TYPE branches to one or the other, depending upon its # arguments. # _AC_CHECK_TYPE_NEW(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # ------------------------------------------------------------ # Check whether the type TYPE is supported by the system, maybe via the # the provided includes. This macro implements the former task of # AC_CHECK_TYPE, with one big difference though: AC_CHECK_TYPE was # grepping in the headers, which, BTW, led to many problems until # the egrep expression was correct and did not given false positives. # It turned out there are even portability issues with egrep... # # The most obvious way to check for a TYPE is just to compile a variable # definition: # # TYPE my_var; # # Unfortunately this does not work for const qualified types in C++, # where you need an initializer. So you think of # # TYPE my_var = (TYPE) 0; # # Unfortunately, again, this is not valid for some C++ classes. # # Then you look for another scheme. For instance you think of declaring # a function which uses a parameter of type TYPE: # # int foo (TYPE param); # # but of course you soon realize this does not make it with K&R # compilers. And by no ways you want to # # int foo (param) # TYPE param # { ; } # # since this time it's C++ who is not happy. # # Don't even think of the return type of a function, since K&R cries # there too. So you start thinking of declaring a *pointer* to this TYPE: # # TYPE *p; # # but you know fairly well that this is legal in C for aggregates which # are unknown (TYPE = struct does-not-exist). # # Then you think of using sizeof to make sure the TYPE is really # defined: # # sizeof (TYPE); # # But this succeeds if TYPE is a variable: you get the size of the # variable's type!!! # # This time you tell yourself the last two options *together* will make # it. And indeed this is the solution invented by Alexandre Oliva. # # Also note that we use # # if (sizeof (TYPE)) # # to `read' sizeof (to avoid warnings), while not depending on its type # (not necessarily size_t etc.). Equally, instead of defining an unused # variable, we just use a cast to avoid warnings from the compiler. # Suggested by Paul Eggert. define([_AC_CHECK_TYPE_NEW], [AC_REQUIRE([AC_HEADER_STDC])dnl AC_VAR_PUSHDEF([ac_Type], [ac_cv_type_$1])dnl AC_CACHE_CHECK([for $1], ac_Type, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])], [if (($1 *) 0) return 0; if (sizeof ($1)) return 0;])], AC_VAR_SET(ac_Type, yes), AC_VAR_SET(ac_Type, no))]) AC_SHELL_IFELSE([test AC_VAR_GET(ac_Type) = yes], [$2], [$3])dnl AC_VAR_POPDEF([ac_Type])dnl ])# _AC_CHECK_TYPE_NEW # AC_CHECK_TYPES(TYPES, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # -------------------------------------------------------- # TYPES is an m4 list. There are no ambiguities here, we mean the newer # AC_CHECK_TYPE. AC_DEFUN([AC_CHECK_TYPES], [m4_foreach([AC_Type], [$1], [_AC_CHECK_TYPE_NEW(AC_Type, [AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_[]AC_Type), 1, [Define if the system has the type `]AC_Type['.]) $2], [$3], [$4])])]) # _AC_CHECK_TYPE_OLD(TYPE, DEFAULT) # --------------------------------- # FIXME: This is an extremely badly chosen name, since this # macro actually performs an AC_REPLACE_TYPE. Some day we # have to clean this up. define([_AC_CHECK_TYPE_OLD], [_AC_CHECK_TYPE_NEW([$1],, [AC_DEFINE_UNQUOTED([$1], [$2], [Define to `$2' if does not define.])])dnl ])# _AC_CHECK_TYPE_OLD # _AC_CHECK_TYPE_REPLACEMENT_TYPE_P(STRING) # ----------------------------------------- # Return `1' if STRING seems to be a builtin C/C++ type, i.e., if it # starts with `_Bool', `bool', `char', `double', `float', `int', # `long', `short', `signed', or `unsigned' followed by characters # that are defining types. # Because many people have used `off_t' and `size_t' too, they are added # for better common-useward backward compatibility. define([_AC_CHECK_TYPE_REPLACEMENT_TYPE_P], [ifelse(regexp([$1], [^\(_Bool\|bool\|char\|double\|float\|int\|long\|short\|\(un\)?signed\|size_t\|off_t\)\([_a-zA-Z0-9() *]\|\[\|\]\)*$]), 0, 1, 0)dnl ])# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P # _AC_CHECK_TYPE_MAYBE_TYPE_P(STRING) # ----------------------------------- # Return `1' if STRING looks like a C/C++ type. define([_AC_CHECK_TYPE_MAYBE_TYPE_P], [ifelse(regexp([$1], [^[_a-zA-Z0-9 ]+\([_a-zA-Z0-9() *]\|\[\|\]\)*$]), 0, 1, 0)dnl ])# _AC_CHECK_TYPE_MAYBE_TYPE_P # AC_CHECK_TYPE(TYPE, DEFAULT) # or # AC_CHECK_TYPE(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # ------------------------------------------------------- # # Dispatch respectively to _AC_CHECK_TYPE_OLD or _AC_CHECK_TYPE_NEW. # 1. More than two arguments => NEW # 2. $2 seems to be replacement type => OLD # See _AC_CHECK_TYPE_REPLACEMENT_TYPE_P for `replacement type'. # 3. $2 seems to be a type => NEW plus a warning # 4. default => NEW AC_DEFUN([AC_CHECK_TYPE], [ifelse($#, 3, [_AC_CHECK_TYPE_NEW($@)], $#, 4, [_AC_CHECK_TYPE_NEW($@)], _AC_CHECK_TYPE_REPLACEMENT_TYPE_P([$2]), 1, [_AC_CHECK_TYPE_OLD($@)], _AC_CHECK_TYPE_MAYBE_TYPE_P([$2]), 1, [m4_warn([$0: assuming `$2' is not a type])_AC_CHECK_TYPE_NEW($@)], [_AC_CHECK_TYPE_NEW($@)])[]dnl ])# AC_CHECK_TYPE ## ----------------------- ## ## Creating output files. ## ## ----------------------- ## # This section handles about all the preparation aspects for # `config.status': registering the configuration files, the headers, # the links, and the commands `config.status' will run. There is a # little mixture though of things actually handled by `configure', # such as running the `configure' in the sub directories. Minor # detail. # # There are two kinds of commands: # # COMMANDS: # # They are output into `config.status' via a quoted here doc. These # commands are always associated to a tag which the user can use to # tell `config.status' what are the commands she wants to run. # # INIT-CMDS: # # They are output via an *unquoted* here-doc. As a consequence $var # will be output as the value of VAR. This is typically used by # `configure' to give `config,.status' some variables it needs to run # the COMMANDS. At the difference of `COMMANDS', the INIT-CMDS are # always run. # # # Some uniformity exists around here, please respect it! # # A macro named AC_CONFIG_FOOS has three args: the `TAG...' (or # `FILE...' when it applies), the `COMMANDS' and the `INIT-CMDS'. It # first checks that TAG was not registered elsewhere thanks to # AC_CONFIG_UNIQUE. Then it registers `TAG...' in AC_LIST_FOOS, and for # each `TAG', a special line in AC_LIST_FOOS_COMMANDS which is used in # `config.status' like this: # # case $ac_tag in # AC_LIST_FOOS_COMMANDS # esac # # Finally, the `INIT-CMDS' are dumped into a special diversion, via # `_AC_CONFIG_COMMANDS_INIT'. While `COMMANDS' are output once per TAG, # `INIT-CMDS' are dumped only once per call to AC_CONFIG_FOOS. # # It also leave the TAG in the shell variable ac_config_foo which contains # those which will actually be executed. In other words: # # if false; then # AC_CONFIG_FOOS(bar, [touch bar]) # fi # # will not create bar. # # AC_CONFIG_FOOS can be called several times (with different TAGs of # course). # # Because these macros should not output anything, there should be `dnl' # everywhere. A pain my friend, a pain. So instead in each macro we # divert(-1) and restore the diversion at the end. # # # Honorable members of this family are AC_CONFIG_FILES, # AC_CONFIG_HEADERS, AC_CONFIG_LINKS and AC_CONFIG_COMMANDS. Bad boys # are AC_LINK_FILES, AC_OUTPUT_COMMANDS and AC_OUTPUT when used with # arguments. False members are AC_CONFIG_SRCDIR, AC_CONFIG_SUBDIRS # and AC_CONFIG_AUX_DIR. Cousins are AC_CONFIG_COMMANDS_PRE and # AC_CONFIG_COMMANDS_POST. # AC_CONFIG_IF_MEMBER(DEST, LIST, ACTION-IF-TRUE, ACTION-IF-FALSE) # ---------------------------------------------------------------- # If DEST is member of LIST, expand to ACTION-IF-TRUE, else ACTION-IF-FALSE. # # LIST is an AC_CONFIG list, i.e., a list of DEST[:SOURCE], separated # with spaces. # # FIXME: This macro is badly designed, but I'm not guilty: m4 is. There # is just no way to simply compare two strings in m4, but to use pattern # matching. The big problem is then that the active characters should # be quoted. Currently `+*.' are quoted. define([AC_CONFIG_IF_MEMBER], [ifelse(regexp($2, [\(^\| \)]patsubst([$1], [\([+*.]\)], [\\\1])[\(:\| \|$\)]), -1, [$4], [$3])]) # AT_FILE_DEPENDENCY(DEST, SOURCE1, [SOURCE2...]) # ----------------------------------------------- # This macro does nothing, it's a hook to be read with `autoconf --trace'. # It announces DEST depends upon the SOURCE1 etc. define([AT_FILE_DEPENDENCY], []) # _AC_CONFIG_DEPENDENCY(DEST, [SOURCE1], [SOURCE2...]) # ---------------------------------------------------- # Be sure that a missing dependency is expressed as a dependency upon # `DEST.in'. define([_AC_CONFIG_DEPENDENCY], [ifval([$2], [AT_FILE_DEPENDENCY($@)], [AT_FILE_DEPENDENCY([$1], [$1.in])])]) # _AC_CONFIG_DEPENDENCIES(DEST[:SOURCE1[:SOURCE2...]]...) # ------------------------------------------------------- # Declare the DESTs depend upon their SOURCE1 etc. define([_AC_CONFIG_DEPENDENCIES], [AC_DIVERT_PUSH([KILL]) AC_FOREACH([AC_File], [$1], [_AC_CONFIG_DEPENDENCY(patsubst(AC_File, [:], [,]))]) AC_DIVERT_POP()dnl ]) # _AC_CONFIG_UNIQUE(DEST[:SOURCE]...) # ----------------------------------- # # Verify that there is no double definition of an output file # (precisely, guarantees there is no common elements between # CONFIG_HEADERS, CONFIG_FILES, CONFIG_LINKS, and CONFIG_SUBDIRS). # # Note that this macro does not check if the list $[1] itself # contains doubles. define([_AC_CONFIG_UNIQUE], [AC_DIVERT_PUSH([KILL]) AC_FOREACH([AC_File], [$1], [pushdef([AC_Dest], patsubst(AC_File, [:.*])) AC_CONFIG_IF_MEMBER(AC_Dest, [AC_LIST_HEADERS], [AC_FATAL(`AC_Dest' [is already registered with AC_CONFIG_HEADER or AC_CONFIG_HEADERS.])]) AC_CONFIG_IF_MEMBER(AC_Dest, [AC_LIST_LINKS], [AC_FATAL(`AC_Dest' [is already registered with AC_CONFIG_LINKS.])]) AC_CONFIG_IF_MEMBER(AC_Dest, [_AC_LIST_SUBDIRS], [AC_FATAL(`AC_Dest' [is already registered with AC_CONFIG_SUBDIRS.])]) AC_CONFIG_IF_MEMBER(AC_Dest, [AC_LIST_COMMANDS], [AC_FATAL(`AC_Dest' [is already registered with AC_CONFIG_COMMANDS.])]) AC_CONFIG_IF_MEMBER(AC_Dest, [AC_LIST_FILES], [AC_FATAL(`AC_Dest' [is already registered with AC_CONFIG_FILES or AC_OUTPUT.])]) popdef([AC_Dest])]) AC_DIVERT_POP()dnl ]) # _AC_CONFIG_COMMANDS_INIT([INIT-COMMANDS]) # ----------------------------------------- # # Register INIT-COMMANDS as command pasted *unquoted* in # `config.status'. This is typically used to pass variables from # `configure' to `config.status'. Note that $[1] is not over quoted as # was the case in AC_OUTPUT_COMMANDS. define([_AC_CONFIG_COMMANDS_INIT], [ifval([$1], [m4_append([_AC_OUTPUT_COMMANDS_INIT], [$1 ])])]) # Initialize. define([_AC_OUTPUT_COMMANDS_INIT]) # AC_CONFIG_COMMANDS(NAME...,[COMMANDS], [INIT-CMDS]) # --------------------------------------------------- # # Specify additional commands to be run by config.status. This # commands must be associated with a NAME, which should be thought # as the name of a file the COMMANDS create. AC_DEFUN([AC_CONFIG_COMMANDS], [AC_DIVERT_PUSH([KILL]) _AC_CONFIG_UNIQUE([$1]) m4_append([AC_LIST_COMMANDS], [ $1]) ifelse([$2],,, [AC_FOREACH([AC_Name], [$1], [m4_append([AC_LIST_COMMANDS_COMMANDS], [ ]patsubst(AC_Name, [:.*])[ ) $2 ;; ])])]) _AC_CONFIG_COMMANDS_INIT([$3]) AC_DIVERT_POP()dnl ac_config_commands="$ac_config_commands $1" ])dnl # Initialize the lists. define([AC_LIST_COMMANDS]) define([AC_LIST_COMMANDS_COMMANDS]) # AC_OUTPUT_COMMANDS(EXTRA-CMDS, INIT-CMDS) # ----------------------------------------- # # Add additional commands for AC_OUTPUT to put into config.status. # # This macro is an obsolete version of AC_CONFIG_COMMANDS. The only # difficulty in mapping AC_OUTPUT_COMMANDS to AC_CONFIG_COMMANDS is # to give a unique key. The scheme we have chosen is `default-1', # `default-2' etc. for each call. # # Unfortunately this scheme is fragile: bad things might happen # if you update an included file and configure.in: you might have # clashes :( On the other hand, I'd like to avoid weird keys (e.g., # depending upon __file__ or the pid). AU_DEFUN([AC_OUTPUT_COMMANDS], [define([_AC_OUTPUT_COMMANDS_CNT], incr(_AC_OUTPUT_COMMANDS_CNT))dnl dnl Double quoted since that was the case in the original macro. AC_CONFIG_COMMANDS([default-]_AC_OUTPUT_COMMANDS_CNT, [[$1]], [[$2]])dnl ]) # Initialize. AU_DEFUN([_AC_OUTPUT_COMMANDS_CNT], 0) # AC_CONFIG_COMMANDS_PRE(CMDS) # ---------------------------- # Commands to run right before config.status is created. Accumulates. AC_DEFUN([AC_CONFIG_COMMANDS_PRE], [m4_append([AC_OUTPUT_COMMANDS_PRE], [$1 ])]) # Initialize. define([AC_OUTPUT_COMMANDS_PRE]) # AC_CONFIG_COMMANDS_POST(CMDS) # ----------------------------- # Commands to run after config.status was created. Accumulates. AC_DEFUN([AC_CONFIG_COMMANDS_POST], [m4_append([AC_OUTPUT_COMMANDS_POST], [$1 ])]) # Initialize. define([AC_OUTPUT_COMMANDS_POST]) # AC_CONFIG_HEADERS(HEADERS..., [COMMANDS], [INIT-CMDS]) # ------------------------------------------------------ # Specify that the HEADERS are to be created by instantiation of the # AC_DEFINEs. Associate the COMMANDS to the HEADERS. This macro # accumulates if called several times. # # The commands are stored in a growing string AC_LIST_HEADERS_COMMANDS # which should be used like this: # # case $ac_file in # AC_LIST_HEADERS_COMMANDS # esac AC_DEFUN([AC_CONFIG_HEADERS], [AC_DIVERT_PUSH([KILL]) _AC_CONFIG_UNIQUE([$1]) _AC_CONFIG_DEPENDENCIES([$1]) m4_append([AC_LIST_HEADERS], [ $1]) dnl Register the commands ifelse([$2],,, [AC_FOREACH([AC_File], [$1], [m4_append([AC_LIST_HEADERS_COMMANDS], [ ]patsubst(AC_File, [:.*])[ ) $2 ;; ])])]) _AC_CONFIG_COMMANDS_INIT([$3]) AC_DIVERT_POP()dnl ac_config_headers="$ac_config_headers $1" ])dnl # Initialize to empty. It is much easier and uniform to have a config # list expand to empty when undefined, instead of special casing when # not defined (since in this case, AC_CONFIG_FOO expands to AC_CONFIG_FOO). define([AC_LIST_HEADERS]) define([AC_LIST_HEADERS_COMMANDS]) # AC_CONFIG_HEADER(HEADER-TO-CREATE ...) # -------------------------------------- # FIXME: Make it obsolete? AC_DEFUN([AC_CONFIG_HEADER], [AC_CONFIG_HEADERS([$1])]) # AC_CONFIG_LINKS(DEST:SOURCE..., [COMMANDS], [INIT-CMDS]) # -------------------------------------------------------- # Specify that config.status should establish a (symbolic if possible) # link from TOP_SRCDIR/SOURCE to TOP_SRCDIR/DEST. # Reject DEST=., because it is makes it hard for ./config.status # to guess the links to establish (`./config.status .'). AC_DEFUN([AC_CONFIG_LINKS], [AC_DIVERT_PUSH([KILL]) _AC_CONFIG_UNIQUE([$1]) _AC_CONFIG_DEPENDENCIES([$1]) ifelse(regexp([$1], [^\.:\| \.:]), -1,, [AC_FATAL([$0: invalid destination: `.'])]) m4_append([AC_LIST_LINKS], [ $1]) dnl Register the commands ifelse([$2],,, [AC_FOREACH([AC_File], [$1], [m4_append([AC_LIST_LINKS_COMMANDS], [ ]patsubst(AC_File, [:.*])[ ) $2 ;; ])])]) _AC_CONFIG_COMMANDS_INIT([$3]) AC_DIVERT_POP()dnl ac_config_links="$ac_config_links $1" ])dnl # Initialize the list. define([AC_LIST_LINKS]) define([AC_LIST_LINKS_COMMANDS]) # AC_LINK_FILES(SOURCE..., DEST...) # --------------------------------- # Link each of the existing files SOURCE... to the corresponding # link name in DEST... # # Unfortunately we can't provide a very good autoupdate service here, # since in `AC_LINK_FILES($from, $to)' it is possible that `$from' # and `$to' are actually lists. It would then be completely wrong to # replace it with `AC_CONFIG_LINKS($to:$from). It is possible in the # case of literal values though, but because I don't think there is any # interest in creating config links with literal values, no special # mechanism is implemented to handle them. # # _AC_LINK_CNT is used to be robust to multiple calls. AU_DEFUN([AC_LINK_FILES], [ifelse($#, 2, , [m4_fatal([$0: incorrect number of arguments])])dnl define([_AC_LINK_FILES_CNT], incr(_AC_LINK_FILES_CNT))dnl ac_sources="$1" ac_dests="$2" while test -n "$ac_sources"; do set $ac_dests; ac_dest=$[1]; shift; ac_dests=$[*] set $ac_sources; ac_source=$[1]; shift; ac_sources=$[*] [ac_config_links_]_AC_LINK_FILES_CNT="$[ac_config_links_]_AC_LINK_FILES_CNT $ac_dest:$ac_source" done AC_CONFIG_LINKS($[ac_config_links_]_AC_LINK_FILES_CNT)dnl ], [ It is technically impossible to `autoupdate' cleanly from AC_LINK_FILES to AC_CONFIG_FILES. `autoupdate' provides a functional but inelegant update, you should probably tune the result yourself.])# AC_LINK_FILES # Initialize. AU_DEFUN([_AC_LINK_FILES_CNT], 0) # AC_CONFIG_FILES(FILE..., [COMMANDS], [INIT-CMDS]) # ------------------------------------------------- # Specify output files, as with AC_OUTPUT, i.e., files that are # configured with AC_SUBST. Associate the COMMANDS to each FILE, # i.e., when config.status creates FILE, run COMMANDS afterwards. # # The commands are stored in a growing string AC_LIST_FILES_COMMANDS # which should be used like this: # # case $ac_file in # AC_LIST_FILES_COMMANDS # esac AC_DEFUN([AC_CONFIG_FILES], [AC_DIVERT_PUSH([KILL]) _AC_CONFIG_UNIQUE([$1]) _AC_CONFIG_DEPENDENCIES([$1]) m4_append([AC_LIST_FILES], [ $1]) dnl Register the commands. ifelse([$2],,, [AC_FOREACH([AC_File], [$1], [m4_append([AC_LIST_FILES_COMMANDS], [ ]patsubst(AC_File, [:.*])[ ) $2 ;; ])])]) _AC_CONFIG_COMMANDS_INIT([$3]) AC_DIVERT_POP()dnl ac_config_files="$ac_config_files $1" ])dnl # Initialize the lists. define([AC_LIST_FILES]) define([AC_LIST_FILES_COMMANDS]) # AC_CONFIG_SUBDIRS(DIR ...) # -------------------------- # We define two variables: # - ac_subdirs_all # is built in the `default' section, and should contain *all* # the arguments of AC_CONFIG_SUBDIRS. It is used for --help=recursive. # It makes no sense for arguments which are sh variables. # - subdirs # which is built at runtime, so some of these dirs might not be # included, if for instance the user refused a part of the tree. # This is used in _AC_OUTPUT_SUBDIRS. # _AC_LIST_SUBDIRS is used only for _AC_CONFIG_UNIQUE. AC_DEFUN([AC_CONFIG_SUBDIRS], [_AC_CONFIG_UNIQUE([$1])dnl AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl m4_append([_AC_LIST_SUBDIRS], [ $1])dnl AC_VAR_IF_INDIR([$1], [AC_DIAGNOSE(syntax, [$0: you should use literals])]) AC_DIVERT([DEFAULTS], [ac_subdirs_all="$ac_subdirs_all $1"]) AC_SUBST(subdirs, "$subdirs $1")dnl ]) # Initialize the list. define([_AC_LIST_SUBDIRS]) # autoupdate::AC_OUTPUT([CONFIG_FILES...], [EXTRA-CMDS], [INIT-CMDS]) # ------------------------------------------------------------------- # # If there are arguments given to AC_OUTPUT, dispatch them to the # proper modern macros. AU_DEFUN([AC_OUTPUT], [ifval([$1], [AC_CONFIG_FILES([$1]) ])dnl ifval([$2$3], [AC_CONFIG_COMMANDS(default, [[$2]], [[$3]]) ])dnl [AC_OUTPUT]], [`AC_OUTPUT' should be used without arguments.]) # AC_OUTPUT([CONFIG_FILES...], [EXTRA-CMDS], [INIT-CMDS]) # ------------------------------------------------------- # The big finish. # Produce config.status, config.h, and links; and configure subdirs. # The CONFIG_HEADERS are defined in the m4 variable AC_LIST_HEADERS. # Pay special attention not to have too long here docs: some old # shells die. Unfortunately the limit is not known precisely... define([AC_OUTPUT], [dnl Dispatch the extra arguments to their native macros. ifval([$1], [AC_CONFIG_FILES([$1])])dnl ifval([$2$3], [AC_CONFIG_COMMANDS(default, [$2], [$3])])dnl trap '' 1 2 15 AC_CACHE_SAVE trap 'rm -fr conftest* confdefs* core core.* *.core $ac_clean_files; exit 1' 1 2 15 test "x$prefix" = xNONE && prefix=$ac_default_prefix # Let make expand exec_prefix. test "x$exec_prefix" = xNONE && exec_prefix='${prefix}' # Any assignment to VPATH causes Sun make to only execute # the first set of double-colon rules, so remove it if not needed. # If there is a colon in the path, we need to keep it. if test "x$srcdir" = x.; then ac_vpsub=['/^[ ]*VPATH[ ]*=[^:]*$/d'] fi ifset([AC_LIST_HEADERS], [DEFS=-DHAVE_CONFIG_H], [AC_OUTPUT_MAKE_DEFS()]) dnl Commands to run before creating config.status. AC_OUTPUT_COMMANDS_PRE()dnl # Save into config.log some information that might help in debugging. echo >&AC_FD_LOG echo "Cache variables:" >&AC_FD_LOG _AC_CACHE_DUMP | sed 's/^/| /' >&AC_FD_LOG echo >&AC_FD_LOG echo "confdefs.h:" >&AC_FD_LOG cat confdefs.h | sed 's/^/| /' >&AC_FD_LOG : ${CONFIG_STATUS=./config.status} trap 'rm -f $CONFIG_STATUS conftest*; exit 1' 1 2 15 _AC_OUTPUT_CONFIG_STATUS()dnl rm -fr confdefs* $ac_clean_files trap 'exit 1' 1 2 15 dnl Commands to run after config.status was created AC_OUTPUT_COMMANDS_POST()dnl test "$no_create" = yes || $SHELL $CONFIG_STATUS || exit 1 dnl config.status should not do recursion. AC_PROVIDE_IFELSE([AC_CONFIG_SUBDIRS], [_AC_OUTPUT_SUBDIRS()])dnl ])# AC_OUTPUT # _AC_OUTPUT_CONFIG_STATUS # ------------------------ # Produce config.status. Called by AC_OUTPUT. # Pay special attention not to have too long here docs: some old # shells die. Unfortunately the limit is not known precisely... define([_AC_OUTPUT_CONFIG_STATUS], [echo creating $CONFIG_STATUS cat >$CONFIG_STATUS <<\EOF #! /bin/sh # Generated automatically by configure. # Run this file to recreate the current configuration. # Compiler output produced by configure, useful for debugging # configure, is in ./config.log if it exists. debug=false me=`echo "$[0]" | sed 's,.*/,,'` SHELL=${CONFIG_SHELL-/bin/sh} EOF # Files that config.status was made for. if test -n "$ac_config_files"; then echo "config_files=\"$ac_config_files\"" >>$CONFIG_STATUS fi if test -n "$ac_config_headers"; then echo "config_headers=\"$ac_config_headers\"" >>$CONFIG_STATUS fi if test -n "$ac_config_links"; then echo "config_links=\"$ac_config_links\"" >>$CONFIG_STATUS fi if test -n "$ac_config_commands"; then echo "config_commands=\"$ac_config_commands\"" >>$CONFIG_STATUS fi cat >>$CONFIG_STATUS <<\EOF ac_cs_usage="\ \`$me' instantiates files from templates according to the current configuration. Usage: $[0] [[OPTIONS]] FILE... -h, --help print this help, then exit -V, --version print version number, then exit -d, --debug don't remove temporary files --recheck update $me by reconfiguring in the same conditions ifset([AC_LIST_FILES], [[ --file=FILE[:TEMPLATE] instantiate the configuration file FILE ]])dnl ifset([AC_LIST_HEADERS], [[ --header=FILE[:TEMPLATE] instantiate the configuration header FILE ]])dnl ifset([AC_LIST_FILES], [Configuration files: $config_files ])dnl ifset([AC_LIST_HEADERS], [Configuration headers: $config_headers ])dnl ifset([AC_LIST_LINKS], [Configuration links: $config_links ])dnl ifset([AC_LIST_COMMANDS], [Configuration commands: $config_commands ])dnl Report bugs to ." EOF dnl hostname on some systems (SVR3.2, Linux) returns a bogus exit status, dnl so uname gets run too. Use two double quotes for font-lock. cat >>$CONFIG_STATUS <>$CONFIG_STATUS <<\EOF # If no file are specified by the user, then we need to provide default # value. By we need to know if files were specified by the user. ac_need_defaults=: while test $[#] != 0 do case $[1] in --*=*) ac_option=`expr "x$[1]" : 'x\([[^=]]*\)='` ac_optarg=`expr "x$[1]" : 'x[[^=]]*=\(.*\)'` shift set dummy "$ac_option" "$ac_optarg" ${1+"$[@]"} shift ;; -*);; *) # This is not an option, so the user has probably given explicit # arguments. ac_need_defaults=false;; esac case $[1] in # Handling of the options. EOF cat >>$CONFIG_STATUS <>$CONFIG_STATUS <<\EOF --version | --vers* | -V ) echo "$ac_cs_version"; exit 0 ;; --he | --h) # Conflict between --help and --header echo "$me: ambiguous option: $ac_option Try \`$me --help' for more information."; exit 1 ;; --help | --hel | -h ) echo "$ac_cs_usage"; exit 0 ;; --debug | --d* | -d ) debug=: ;; --file | --fil | --fi | --f ) shift CONFIG_FILES="$CONFIG_FILES $[1]" ac_need_defaults=false;; --header | --heade | --head | --hea ) shift CONFIG_HEADERS="$CONFIG_HEADERS $[1]" ac_need_defaults=false;; # Handling of arguments. AC_FOREACH([AC_File], AC_LIST_FILES, [ 'patsubst(AC_File, [:.*])' )dnl CONFIG_FILES="$CONFIG_FILES AC_File" ;; ])dnl AC_FOREACH([AC_File], AC_LIST_LINKS, [ 'patsubst(AC_File, [:.*])' )dnl CONFIG_LINKS="$CONFIG_LINKS AC_File" ;; ])dnl AC_FOREACH([AC_File], AC_LIST_COMMANDS, [ 'patsubst(AC_File, [:.*])' )dnl CONFIG_COMMANDS="$CONFIG_COMMANDS AC_File" ;; ])dnl AC_FOREACH([AC_File], AC_LIST_HEADERS, [ 'patsubst(AC_File, [:.*])' )dnl CONFIG_HEADERS="$CONFIG_HEADERS AC_File" ;; ])dnl # This is an error. -*) echo "$me: unrecognized option: $[1] Try \`$me --help' for more information."; exit 1 ;; *) echo "$me: invalid argument: $[1]"; exit 1 ;; esac shift done EOF dnl Issue this section only if there were actually config files. dnl This checks if one of AC_LIST_HEADERS, AC_LIST_FILES, AC_LIST_COMMANDS, dnl or AC_LIST_LINKS is set. ifval(AC_LIST_HEADERS()AC_LIST_LINKS()AC_LIST_FILES()AC_LIST_COMMANDS(), [cat >>$CONFIG_STATUS <<\EOF # If the user did not use the arguments to specify the items to instantiate, # then the envvar interface is used. Set only those that are not. if $ac_need_defaults; then ifset([AC_LIST_FILES], [ : ${CONFIG_FILES=$config_files} ])dnl ifset([AC_LIST_HEADERS], [ : ${CONFIG_HEADERS=$config_headers} ])dnl ifset([AC_LIST_LINKS], [ : ${CONFIG_LINKS=$config_links} ])dnl ifset([AC_LIST_COMMANDS], [ : ${CONFIG_COMMANDS=$config_commands} ])dnl fi _AC_SHELL_TMPDIR(cs) EOF ])[]dnl ifval dnl We output the INIT-CMDS first for obvious reasons :) ifset([_AC_OUTPUT_COMMANDS_INIT], [cat >>$CONFIG_STATUS <>$CONFIG_STATUS <<\EOF exit 0 EOF chmod +x $CONFIG_STATUS ])# _AC_OUTPUT_CONFIG_STATUS # AC_OUTPUT_MAKE_DEFS # ------------------- # Set the DEFS variable to the -D options determined earlier. # This is a subroutine of AC_OUTPUT. # It is called inside configure, outside of config.status. # Using a here document instead of a string reduces the quoting nightmare. define([AC_OUTPUT_MAKE_DEFS], [[# Transform confdefs.h into DEFS. # Protect against shell expansion while executing Makefile rules. # Protect against Makefile macro expansion. # # If the first sed substitution is executed (which looks for macros that # take arguments), then we branch to the cleanup section. Otherwise, # look for a macro that doesn't take arguments. cat >confdef2opt.sed <<\EOF t clear : clear s,^[ ]*#[ ]*define[ ][ ]*\([^ (][^ (]*([^)]*)\)[ ]*\(.*\),-D\1=\2,g t cleanup s,^[ ]*#[ ]*define[ ][ ]*\([^ ][^ ]*\)[ ]*\(.*\),-D\1=\2,g : cleanup s,[ `~#$^&*(){}\\|;'"<>?],\\&,g s,\[,\\&,g s,\],\\&,g s,\$,$$,g EOF # We use echo to avoid assuming a particular line-breaking character. # The extra dot is to prevent the shell from consuming trailing # line-breaks from the sub-command output. A line-break within # single-quotes doesn't work because, if this script is created in a # platform that uses two characters for line-breaks (e.g., DOS), tr # would break. ac_LF_and_DOT=`echo; echo .` DEFS=`sed -f confdef2opt.sed confdefs.h | tr "$ac_LF_and_DOT" ' .'` rm -f confdef2opt.sed ]])# AC_OUTPUT_MAKE_DEFS # _AC_OUTPUT_FILES # ---------------- # Do the variable substitutions to create the Makefiles or whatever. # This is a subroutine of AC_OUTPUT. # # It has to send itself into $CONFIG_STATUS (eg, via here documents). # Upon exit, no here document shall be opened. define([_AC_OUTPUT_FILES], [cat >>$CONFIG_STATUS <\$tmp/subs.sed <<\\CEOF] dnl These here document variables are unquoted when configure runs dnl but quoted when config.status runs, so variables are expanded once. dnl Insert the sed substitutions of variables. _AC_SUBST_SED_PROGRAM()dnl CEOF EOF cat >>$CONFIG_STATUS <<\EOF # Split the substitutions into bite-sized pieces for seds with # small command number limits, like on Digital OSF/1 and HP-UX. dnl One cannot portably go further than 100 commands because of HP-UX. dnl Here, there are 2 cmd per line, and two cmd are added later. ac_max_sed_lines=48 ac_sed_frag=1 # Number of current file. ac_beg=1 # First line for current file. ac_end=$ac_max_sed_lines # Line after last line for current file. ac_more_lines=: ac_sed_cmds= while $ac_more_lines; do if test $ac_beg -gt 1; then sed "1,${ac_beg}d; ${ac_end}q" $tmp/subs.sed >$tmp/subs.frag else sed "${ac_end}q" $tmp/subs.sed >$tmp/subs.frag fi if test ! -s $tmp/subs.frag; then ac_more_lines=false else # The purpose of the label and of the branching condition is to # speed up the sed processing (if there are no `@' at all, there # is no need to browse any of the substitutions). # These are the two extra sed commands mentioned above. 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