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c7eb9bd99e
given in the prologue of acobsolete.m4. * acgeneral.m4 (Prologue): Enter the `autoconf' name space. (AU_DEFUN): New macro. * autoupdate.m4: New file. Disable the name spaces `autoconf', and `libm4'. Disable libm4. * Makefile.am: Tuned to support the changes above. * autoupdate.sh: Model after autoconf.sh. Can run on several files at once (for instance m4/*.m4). Don't touch files that are up to date. Run m4 on autoupdate.m4f instead of playing with sed. Use AU_DEFUN. * acgeneral.m4 (AC_LINK_FILES, AC_ENABLE, AC_WITH): Use AU_DEFUN, remove the call to AC_OBSOLETE. * acspecific.m4 (AC_CYGWIN32): Likewise. * acoldnames.m4: Replaced all the definitions via `define' or `AC_DEFUN' to use `AU_DEFUN'.
213 lines
8.3 KiB
Plaintext
213 lines
8.3 KiB
Plaintext
# This file is part of Autoconf. -*- Autoconf -*-
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# Support old macros, and provide automated updates.
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# Copyright (C) 1994, 1999 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# 02111-1307, USA.
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#
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# Originally written by David J. MacKenzie.
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## -------------- ##
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## Presentation. ##
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## -------------- ##
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# This file is in charge both of providing implementation of
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# obsoleted macros, and to give autoupdate a means to update old
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# files.
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# Formerly, updating was performed by running `sed', but it was
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# limited to just replacing the old names with newer names, nothing
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# was possible when real glue code was needed. One could think to
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# extend the `sed' snippet with specialized code for complex macros.
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# But this approach is of course full of flaws:
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# a. the Autoconf maintainers have to write these snippets, which we
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# just don't want to,
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# b. I really don't think you'll ever manage to handle the quoting of
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# m4 from sed.
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# To satisfy a., let's remark that the code which implements the old
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# features in term of the new feature is exactly the code which
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# should replace the old code.
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# To answer point b, as usual in the history of Autoconf, the answer,
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# at least on the paper, is simple: m4 is the best tool to parse m4,
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# so let's use m4.
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# Therefore the specification is as follow:
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# I want to be able to tell Autoconf, well, m4, that the macro I
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# am currently defining is an obsolete macro (so that the user is
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# warned), which code is the code to use when running autoconf,
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# but that the very same code has to be used when running
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# autoupdate. To summarize, the interface I want is
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# `AU_DEFUN(OLD-NAME, NEW-CODE)'.
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# Now for the technical details.
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# When running autoconf, except for the warning, AU_DEFUN is
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# basically AC_DEFUN.
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# When running autoupdate, we want *only* OLD-NAMEs to be expanded.
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# This obviously means that acgeneral.m4 and acspecific.m4 must not
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# be loaded. Nonetheless, because we want to use a rich set of m4
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# features, libm4.m4 is needed. Please note that the fact that
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# autoconf's macros are not loaded is positive on two points:
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# - we do get an updated `configure.in', not a `configure'!
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# - the old macros are replaced by *calls* to the new-macros, not the
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# body of the new macros, since their body is not defined!!!
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# (Whoa, that's really beautiful!).
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# This first draft is quite functional, but there is a big flaw:
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# obsolete macros that are quoted will not be updated (since m4 won't
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# even try to expand them). The solution is simple: we should just
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# disable the quotes. Well, not quite: libm4.m4 still needs to use
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# quotes for some macros. Well, in this case, when running in
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# autoupdate code, each macro first reestablishes the quotes, expands
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# itself, and disables the quotes.
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# Thinking a bit more, you realize that in fact, people may use `define'
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# `ifelse' etc. in their files, and you certainly don't want to process
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# them. Another example is `dnl': you don't want to remove the comments.
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# You then realize you don't want exactly to import libm4: you want
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# to specify when it is enabled (macros active), and disabled.
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# libm4 provides m4_disable/m4_enable to this end.
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# You're getting close to it. Now remains one task: how to handle
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# twofold definitions?
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# Remember that the same AU_DEFUN must be understand in two different
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# ways, the AC_ way, and the AU_ way.
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# One first solution is to check whether acgeneral.m4 was loaded.
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# But that's definitely not cute. Another is simply to install
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# `hooks', that is to say, to keep in some place m4 knows, late
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# `define' to be triggered *only* in AU_ mode.
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# You first think to design AU_DEFUN like this:
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# 1. AC_DEFUN(OLD-NAME,
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# [Warn the user OLD-NAME is obsolete.
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# NEW-CODE])
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# 2. Store for late AU_ binding([define(OLD_NAME,
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# [Reestablish the quotes.
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# NEW-CODE
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# Disable the quotes.])])
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# but this will not work: NEW-CODE has probably $1, $2 etc. and these
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# guys will be replaced with the argument of `Store for late AU_
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# binding' when you call it.
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# I don't think there is a means to avoid this using this technology
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# (remember that $1 etc. are *always* expanded in m4). You may also
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# try to replace them with $[1] to preserve them for a later
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# evaluation, but if `Store for late AU_ binding' is properly
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# written, it will remain quoted till the end...
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# You have to change technology. Since the problem is that `$1'
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# etc. should be `consumed' right away, one solution is to define now
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# a second macro, `AU_OLD-NAME', and to install a hook than binds
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# OLD-NAME to AU_OLD-NAME. Then, autoupdate.m4 just need to run the
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# hooks. By the way, the same method is used in autoheader.
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## ---------------------------- ##
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## General macros of autoconf. ##
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## ---------------------------- ##
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AU_DEFUN(AC_WARN, [AC_MSG_WARN($@)])
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AU_DEFUN(AC_ERROR, [AC_MSG_ERROR($@)])
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AU_DEFUN(AC_FUNC_CHECK, [AC_CHECK_FUNC($@)])
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AU_DEFUN(AC_HAVE_FUNCS, [AC_CHECK_FUNCS($@)])
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AU_DEFUN(AC_HAVE_HEADERS, [AC_CHECK_HEADERS($@)])
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AU_DEFUN(AC_HEADER_CHECK, [AC_CHECK_HEADER($@)])
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AU_DEFUN(AC_HEADER_EGREP, [AC_EGREP_HEADER($@)])
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AU_DEFUN(AC_PREFIX, [AC_PREFIX_PROGRAM($@)])
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AU_DEFUN(AC_PROGRAMS_CHECK, [AC_CHECK_PROGS($@)])
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AU_DEFUN(AC_PROGRAMS_PATH, [AC_PATH_PROGS($@)])
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AU_DEFUN(AC_PROGRAM_CHECK, [AC_CHECK_PROG($@)])
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AU_DEFUN(AC_PROGRAM_EGREP, [AC_EGREP_CPP($@)])
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AU_DEFUN(AC_PROGRAM_PATH, [AC_PATH_PROG($@)])
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AU_DEFUN(AC_SIZEOF_TYPE, [AC_CHECK_SIZEOF($@)])
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AU_DEFUN(AC_TEST_CPP, [AC_TRY_CPP($@)])
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AU_DEFUN(AC_TEST_PROGRAM, [AC_TRY_RUN($@)])
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## ----------------------------- ##
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## Specific macros of autoconf. ##
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## ----------------------------- ##
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AU_DEFUN(AC_ALLOCA, [AC_FUNC_ALLOCA])
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AU_DEFUN(AC_CHAR_UNSIGNED, [AC_C_CHAR_UNSIGNED])
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AU_DEFUN(AC_CONST, [AC_C_CONST])
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AU_DEFUN(AC_CROSS_CHECK, [AC_C_CROSS])
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AU_DEFUN(AC_FIND_X, [AC_PATH_X])
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AU_DEFUN(AC_FIND_XTRA, [AC_PATH_XTRA])
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AU_DEFUN(AC_GCC_TRADITIONAL, [AC_PROG_GCC_TRADITIONAL])
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AU_DEFUN(AC_GETGROUPS_T, [AC_TYPE_GETGROUPS])
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AU_DEFUN(AC_GETLOADAVG, [AC_FUNC_GETLOADAVG])
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AU_DEFUN(AC_INLINE, [AC_C_INLINE])
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AU_DEFUN(AC_LN_S, [AC_PROG_LN_S])
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AU_DEFUN(AC_LONG_DOUBLE, [AC_C_LONG_DOUBLE])
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AU_DEFUN(AC_LONG_FILE_NAMES, [AC_SYS_LONG_FILE_NAMES])
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AU_DEFUN(AC_MAJOR_HEADER, [AC_HEADER_MAJOR])
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AU_DEFUN(AC_MINUS_C_MINUS_O, [AC_PROG_CC_C_O])
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AU_DEFUN(AC_MMAP, [AC_FUNC_MMAP])
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AU_DEFUN(AC_MODE_T, [AC_TYPE_MODE_T])
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AU_DEFUN(AC_OFF_T, [AC_TYPE_OFF_T])
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AU_DEFUN(AC_PID_T, [AC_TYPE_PID_T])
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AU_DEFUN(AC_RESTARTABLE_SYSCALLS, [AC_SYS_RESTARTABLE_SYSCALLS])
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AU_DEFUN(AC_RETSIGTYPE, [AC_TYPE_SIGNAL])
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AU_DEFUN(AC_SETVBUF_REVERSED, [AC_FUNC_SETVBUF_REVERSED])
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AU_DEFUN(AC_SET_MAKE, [AC_PROG_MAKE_SET])
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AU_DEFUN(AC_SIZE_T, [AC_TYPE_SIZE_T])
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AU_DEFUN(AC_STAT_MACROS_BROKEN, [AC_HEADER_STAT])
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AU_DEFUN(AC_STDC_HEADERS, [AC_HEADER_STDC])
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AU_DEFUN(AC_STRCOLL, [AC_FUNC_STRCOLL])
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AU_DEFUN(AC_ST_BLKSIZE, [AC_STRUCT_ST_BLKSIZE])
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AU_DEFUN(AC_ST_BLOCKS, [AC_STRUCT_ST_BLOCKS])
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AU_DEFUN(AC_ST_RDEV, [AC_STRUCT_ST_RDEV])
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AU_DEFUN(AC_SYS_SIGLIST_DECLARED, [AC_DECL_SYS_SIGLIST])
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AU_DEFUN(AC_TIMEZONE, [AC_STRUCT_TIMEZONE])
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AU_DEFUN(AC_TIME_WITH_SYS_TIME, [AC_HEADER_TIME])
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AU_DEFUN(AC_UID_T, [AC_TYPE_UID_T])
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AU_DEFUN(AC_UTIME_NULL, [AC_FUNC_UTIME_NULL])
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AU_DEFUN(AC_VFORK, [AC_FUNC_VFORK])
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AU_DEFUN(AC_VPRINTF, [AC_FUNC_VPRINTF])
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AU_DEFUN(AC_WAIT3, [AC_FUNC_WAIT3])
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AU_DEFUN(AC_WORDS_BIGENDIAN, [AC_C_BIGENDIAN])
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AU_DEFUN(AC_YYTEXT_POINTER, [AC_DECL_YYTEXT])
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AU_DEFUN(AM_CYGWIN32, [AC_CYGWIN32])
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AU_DEFUN(AM_EXEEXT, [AC_EXEEXT])
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AU_DEFUN(AM_FUNC_FNMATCH, [AC_FUNC_FNMATCH])
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AU_DEFUN(AM_FUNC_MKTIME, [AC_FUNC_MKTIME])
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# We cannot do this, because in libtool.m4 yet they provide
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# this update. Some solution is needed.
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# AU_DEFUN(AM_PROG_LIBTOOL, [AC_PROG_LIBTOOL])
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AU_DEFUN(AM_MINGW32, [AC_MINGW32])
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AU_DEFUN(AM_PROG_INSTALL, [AC_PROG_INSTALL])
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AU_DEFUN(fp_FUNC_FNMATCH, [AC_FUNC_FNMATCH])
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