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564 lines
19 KiB
Plaintext
564 lines
19 KiB
Plaintext
# This file is part of Autoconf. -*- Autoconf -*-
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# Type related macros: existence, sizeof, and structure members.
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# Copyright 2000
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# 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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# As a special exception, the Free Software Foundation gives unlimited
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# permission to copy, distribute and modify the configure scripts that
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# are the output of Autoconf. You need not follow the terms of the GNU
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# General Public License when using or distributing such scripts, even
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# though portions of the text of Autoconf appear in them. The GNU
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# General Public License (GPL) does govern all other use of the material
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# that constitutes the Autoconf program.
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#
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# Certain portions of the Autoconf source text are designed to be copied
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# (in certain cases, depending on the input) into the output of
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# Autoconf. We call these the "data" portions. The rest of the Autoconf
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# source text consists of comments plus executable code that decides which
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# of the data portions to output in any given case. We call these
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# comments and executable code the "non-data" portions. Autoconf never
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# copies any of the non-data portions into its output.
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#
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# This special exception to the GPL applies to versions of Autoconf
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# released by the Free Software Foundation. When you make and
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# distribute a modified version of Autoconf, you may extend this special
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# exception to the GPL to apply to your modified version as well, *unless*
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# your modified version has the potential to copy into its output some
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# of the text that was the non-data portion of the version that you started
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# with. (In other words, unless your change moves or copies text from
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# the non-data portions to the data portions.) If your modification has
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# such potential, you must delete any notice of this special exception
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# to the GPL from your modified version.
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#
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# Written by David MacKenzie, with help from
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# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
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# Roland McGrath, Noah Friedman, david d zuhn, and many others.
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## ---------------- ##
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## Type existence. ##
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## ---------------- ##
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# ---------------- #
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# General checks. #
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# ---------------- #
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# Up to 2.13 included, Autoconf used to provide the macro
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#
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# AC_CHECK_TYPE(TYPE, DEFAULT)
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#
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# Since, it provides another version which fits better with the other
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# AC_CHECK_ families:
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#
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# AC_CHECK_TYPE(TYPE,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
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# [INCLUDES])
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#
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# In order to provide backward compatibility, the new scheme is
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# implemented as _AC_CHECK_TYPE_NEW, the old scheme as _AC_CHECK_TYPE_OLD,
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# and AC_CHECK_TYPE branches to one or the other, depending upon its
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# arguments.
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# _AC_CHECK_TYPE_NEW(TYPE,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
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# [INCLUDES])
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# ------------------------------------------------------------
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# Check whether the type TYPE is supported by the system, maybe via the
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# the provided includes. This macro implements the former task of
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# AC_CHECK_TYPE, with one big difference though: AC_CHECK_TYPE was
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# grepping in the headers, which, BTW, led to many problems until
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# the egrep expression was correct and did not given false positives.
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# It turned out there are even portability issues with egrep...
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#
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# The most obvious way to check for a TYPE is just to compile a variable
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# definition:
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#
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# TYPE my_var;
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#
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# Unfortunately this does not work for const qualified types in C++,
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# where you need an initializer. So you think of
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#
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# TYPE my_var = (TYPE) 0;
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#
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# Unfortunately, again, this is not valid for some C++ classes.
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#
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# Then you look for another scheme. For instance you think of declaring
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# a function which uses a parameter of type TYPE:
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#
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# int foo (TYPE param);
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#
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# but of course you soon realize this does not make it with K&R
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# compilers. And by no ways you want to
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#
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# int foo (param)
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# TYPE param
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# { ; }
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#
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# since this time it's C++ who is not happy.
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#
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# Don't even think of the return type of a function, since K&R cries
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# there too. So you start thinking of declaring a *pointer* to this TYPE:
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#
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# TYPE *p;
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#
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# but you know fairly well that this is legal in C for aggregates which
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# are unknown (TYPE = struct does-not-exist).
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#
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# Then you think of using sizeof to make sure the TYPE is really
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# defined:
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#
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# sizeof (TYPE);
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#
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# But this succeeds if TYPE is a variable: you get the size of the
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# variable's type!!!
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#
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# This time you tell yourself the last two options *together* will make
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# it. And indeed this is the solution invented by Alexandre Oliva.
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#
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# Also note that we use
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#
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# if (sizeof (TYPE))
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#
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# to `read' sizeof (to avoid warnings), while not depending on its type
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# (not necessarily size_t etc.). Equally, instead of defining an unused
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# variable, we just use a cast to avoid warnings from the compiler.
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# Suggested by Paul Eggert.
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m4_define([_AC_CHECK_TYPE_NEW],
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[AC_VAR_PUSHDEF([ac_Type], [ac_cv_type_$1])dnl
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AC_CACHE_CHECK([for $1], ac_Type,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])],
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[if (($1 *) 0)
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return 0;
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if (sizeof ($1))
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return 0;])],
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[AC_VAR_SET(ac_Type, yes)],
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[AC_VAR_SET(ac_Type, no)])])
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AS_IF([test AC_VAR_GET(ac_Type) = yes], [$2], [$3])[]dnl
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AC_VAR_POPDEF([ac_Type])dnl
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])# _AC_CHECK_TYPE_NEW
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# AC_CHECK_TYPES(TYPES,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
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# [INCLUDES])
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# --------------------------------------------------------
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# TYPES is an m4 list. There are no ambiguities here, we mean the newer
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# AC_CHECK_TYPE.
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AC_DEFUN([AC_CHECK_TYPES],
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[m4_foreach([AC_Type], [$1],
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[_AC_CHECK_TYPE_NEW(AC_Type,
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[AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_[]AC_Type), 1,
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[Define if the system has the type
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`]AC_Type['.])
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$2],
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[$3],
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[$4])])])
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# _AC_CHECK_TYPE_OLD(TYPE, DEFAULT)
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# ---------------------------------
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# FIXME: This is an extremely badly chosen name, since this
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# macro actually performs an AC_REPLACE_TYPE. Some day we
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# have to clean this up.
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m4_define([_AC_CHECK_TYPE_OLD],
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[_AC_CHECK_TYPE_NEW([$1],,
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[AC_DEFINE_UNQUOTED([$1], [$2],
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[Define to `$2' if <sys/types.h> does not define.])])dnl
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])# _AC_CHECK_TYPE_OLD
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# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P(STRING)
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# -----------------------------------------
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# Return `1' if STRING seems to be a builtin C/C++ type, i.e., if it
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# starts with `_Bool', `bool', `char', `double', `float', `int',
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# `long', `short', `signed', or `unsigned' followed by characters
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# that are defining types.
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# Because many people have used `off_t' and `size_t' too, they are added
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# for better common-useward backward compatibility.
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m4_define([_AC_CHECK_TYPE_REPLACEMENT_TYPE_P],
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[m4_if(m4_regexp([$1],
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[^\(_Bool\|bool\|char\|double\|float\|int\|long\|short\|\(un\)?signed\|size_t\|off_t\)\([_a-zA-Z0-9() *]\|\[\|\]\)*$]),
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0, 1, 0)dnl
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])# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P
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# _AC_CHECK_TYPE_MAYBE_TYPE_P(STRING)
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# -----------------------------------
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# Return `1' if STRING looks like a C/C++ type.
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m4_define([_AC_CHECK_TYPE_MAYBE_TYPE_P],
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[m4_if(m4_regexp([$1], [^[_a-zA-Z0-9 ]+\([_a-zA-Z0-9() *]\|\[\|\]\)*$]),
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0, 1, 0)dnl
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])# _AC_CHECK_TYPE_MAYBE_TYPE_P
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# AC_CHECK_TYPE(TYPE, DEFAULT)
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# or
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# AC_CHECK_TYPE(TYPE,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
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# [INCLUDES])
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# -------------------------------------------------------
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#
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# Dispatch respectively to _AC_CHECK_TYPE_OLD or _AC_CHECK_TYPE_NEW.
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# 1. More than two arguments => NEW
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# 2. $2 seems to be replacement type => OLD
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# See _AC_CHECK_TYPE_REPLACEMENT_TYPE_P for `replacement type'.
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# 3. $2 seems to be a type => NEW plus a warning
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# 4. default => NEW
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AC_DEFUN([AC_CHECK_TYPE],
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[m4_if($#, 3,
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[_AC_CHECK_TYPE_NEW($@)],
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$#, 4,
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[_AC_CHECK_TYPE_NEW($@)],
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_AC_CHECK_TYPE_REPLACEMENT_TYPE_P([$2]), 1,
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[_AC_CHECK_TYPE_OLD($@)],
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_AC_CHECK_TYPE_MAYBE_TYPE_P([$2]), 1,
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[AC_DIAGNOSE([syntax],
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[$0: assuming `$2' is not a type])_AC_CHECK_TYPE_NEW($@)],
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[_AC_CHECK_TYPE_NEW($@)])[]dnl
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])# AC_CHECK_TYPE
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# ----------------- #
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# Specific checks. #
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# ----------------- #
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# AC_TYPE_GETGROUPS
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# -----------------
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AC_DEFUN([AC_TYPE_GETGROUPS],
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[AC_REQUIRE([AC_TYPE_UID_T])dnl
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AC_CACHE_CHECK(type of array argument to getgroups, ac_cv_type_getgroups,
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[AC_RUN_IFELSE([AC_LANG_SOURCE(
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[[/* Thanks to Mike Rendell for this test. */
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#include <sys/types.h>
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#define NGID 256
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#undef MAX
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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int
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main ()
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{
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gid_t gidset[NGID];
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int i, n;
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union { gid_t gval; long lval; } val;
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val.lval = -1;
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for (i = 0; i < NGID; i++)
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gidset[i] = val.gval;
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n = getgroups (sizeof (gidset) / MAX (sizeof (int), sizeof (gid_t)) - 1,
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gidset);
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/* Exit non-zero if getgroups seems to require an array of ints. This
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happens when gid_t is short but getgroups modifies an array of ints. */
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exit ((n > 0 && gidset[n] != val.gval) ? 1 : 0);
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}]])],
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[ac_cv_type_getgroups=gid_t],
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[ac_cv_type_getgroups=int],
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[ac_cv_type_getgroups=cross])
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if test $ac_cv_type_getgroups = cross; then
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dnl When we can't run the test program (we are cross compiling), presume
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dnl that <unistd.h> has either an accurate prototype for getgroups or none.
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dnl Old systems without prototypes probably use int.
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AC_EGREP_HEADER([getgroups.*int.*gid_t], unistd.h,
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ac_cv_type_getgroups=gid_t, ac_cv_type_getgroups=int)
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fi])
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AC_DEFINE_UNQUOTED(GETGROUPS_T, $ac_cv_type_getgroups,
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[Define to the type of elements in the array set by
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`getgroups'. Usually this is either `int' or `gid_t'.])
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])# AC_TYPE_GETGROUPS
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# AU::AM_TYPE_PTRDIFF_T
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AU_DEFUN([AM_TYPE_PTRDIFF_T],
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[AC_CHECK_TYPES(ptrdiff_t)])
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# AC_TYPE_UID_T
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# -------------
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# FIXME: Rewrite using AC_CHECK_TYPE.
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AC_DEFUN([AC_TYPE_UID_T],
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[AC_CACHE_CHECK(for uid_t in sys/types.h, ac_cv_type_uid_t,
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[AC_EGREP_HEADER(uid_t, sys/types.h,
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ac_cv_type_uid_t=yes, ac_cv_type_uid_t=no)])
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if test $ac_cv_type_uid_t = no; then
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AC_DEFINE(uid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
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AC_DEFINE(gid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
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fi
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])
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AC_DEFUN([AC_TYPE_SIZE_T], [AC_CHECK_TYPE(size_t, unsigned)])
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AC_DEFUN([AC_TYPE_PID_T], [AC_CHECK_TYPE(pid_t, int)])
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AC_DEFUN([AC_TYPE_OFF_T], [AC_CHECK_TYPE(off_t, long)])
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AC_DEFUN([AC_TYPE_MODE_T], [AC_CHECK_TYPE(mode_t, int)])
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# AC_TYPE_SIGNAL
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# --------------
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# Note that identifiers starting with SIG are reserved by ANSI C.
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AC_DEFUN([AC_TYPE_SIGNAL],
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[AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal,
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([#include <sys/types.h>
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#include <signal.h>
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#ifdef signal
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# undef signal
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#endif
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#ifdef __cplusplus
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extern "C" void (*signal (int, void (*)(int)))(int);
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#else
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void (*signal ()) ();
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#endif
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],
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[int i;])],
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[ac_cv_type_signal=void],
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[ac_cv_type_signal=int])])
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AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal,
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[Define as the return type of signal handlers
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(`int' or `void').])
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])
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## ------------------------ ##
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## Checking size of types. ##
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## ------------------------ ##
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# ---------------- #
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# Generic checks. #
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# ---------------- #
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# AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES])
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# --------------------------------------------
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AC_DEFUN([AC_CHECK_SIZEOF],
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[AS_LITERAL_IF([$1], [],
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[AC_FATAL([$0: requires literal arguments])])dnl
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AC_CHECK_TYPE([$1], [], [], [$3])
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AC_CACHE_CHECK([size of $1], AC_TR_SH([ac_cv_sizeof_$1]),
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[if test "$AC_TR_SH([ac_cv_type_$1])" = yes; then
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_AC_COMPUTE_INT([sizeof ($1)],
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[AC_TR_SH([ac_cv_sizeof_$1])],
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[AC_INCLUDES_DEFAULT([$3])])
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else
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AC_TR_SH([ac_cv_sizeof_$1])=0
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fi])dnl
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AC_DEFINE_UNQUOTED(AC_TR_CPP(sizeof_$1), $AC_TR_SH([ac_cv_sizeof_$1]),
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[The size of a `$1', as computed by sizeof.])
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])# AC_CHECK_SIZEOF
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# ---------------- #
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# Generic checks. #
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# ---------------- #
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# AU::AC_INT_16_BITS
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# ------------------
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# What a great name :)
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AU_DEFUN([AC_INT_16_BITS],
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[AC_CHECK_SIZEOF([int])
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AC_DIAGNOSE([obsolete], [$0:
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your code should no longer depend upon `INT_16_BITS', but upon
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`SIZEOF_INT'. Remove this warning and the `AC_DEFINE' when you
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adjust the code.])dnl
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test $ac_cv_sizeof_int = 2 &&
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AC_DEFINE(INT_16_BITS, 1,
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[Define if `sizeof (int)' = 2. Obsolete, use `SIZEOF_INT'.])
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])
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# AU::AC_LONG_64_BITS
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# -------------------
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AU_DEFUN([AC_LONG_64_BITS],
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[AC_CHECK_SIZEOF([long int])
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AC_DIAGNOSE([obsolete], [$0:
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your code should no longer depend upon `LONG_64_BITS', but upon
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`SIZEOF_LONG_INT'. Remove this warning and the `AC_DEFINE' when
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you adjust the code.])dnl
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test $ac_cv_sizeof_long_int = 8 &&
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AC_DEFINE(LONG_64_BITS, 1,
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[Define if `sizeof (long int)' = 8. Obsolete, use
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`SIZEOF_LONG_INT'.])
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])
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## -------------------------- ##
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## Generic structure checks. ##
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## -------------------------- ##
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# ---------------- #
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# Generic checks. #
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# ---------------- #
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# AC_CHECK_MEMBER(AGGREGATE.MEMBER,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
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# [INCLUDES])
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# ---------------------------------------------------------
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# AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell
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# variables are not a valid argument.
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AC_DEFUN([AC_CHECK_MEMBER],
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[AS_LITERAL_IF([$1], [],
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[AC_FATAL([$0: requires literal arguments])])dnl
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m4_if(m4_regexp([$1], [\.]), -1,
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[AC_FATAL([$0: Did not see any dot in `$1'])])dnl
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AC_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])dnl
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dnl Extract the aggregate name, and the member name
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AC_CACHE_CHECK([for $1], ac_Member,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])],
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[dnl AGGREGATE foo;
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m4_patsubst([$1], [\..*]) foo;
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dnl foo.MEMBER;
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foo.m4_patsubst([$1], [^[^.]*\.]);])],
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[AC_VAR_SET(ac_Member, yes)],
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[AC_VAR_SET(ac_Member, no)])])
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AS_IF([test AC_VAR_GET(ac_Member) = yes], [$2], [$3])dnl
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AC_VAR_POPDEF([ac_Member])dnl
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])# AC_CHECK_MEMBER
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# AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
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# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]
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# [INCLUDES])
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# ---------------------------------------------------------
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# The first argument is an m4 list.
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AC_DEFUN([AC_CHECK_MEMBERS],
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[m4_foreach([AC_Member], [$1],
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[AC_CHECK_MEMBER(AC_Member,
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[AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_[]AC_Member), 1,
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[Define if `]m4_patsubst(AC_Member,
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[^[^.]*\.])[' is
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member of `]m4_patsubst(AC_Member, [\..*])['.])
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$2],
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[$3],
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[$4])])])
|
|
|
|
|
|
# ----------------- #
|
|
# Specific checks. #
|
|
# ----------------- #
|
|
|
|
# Alphabetic order, please.
|
|
|
|
# AC_STRUCT_ST_BLKSIZE
|
|
# --------------------
|
|
AU_DEFUN([AC_STRUCT_ST_BLKSIZE],
|
|
[AC_DIAGNOSE([obsolete], [$0:
|
|
your code should no longer depend upon `HAVE_ST_BLKSIZE', but
|
|
`HAVE_STRUCT_STAT_ST_BLKSIZE'. Remove this warning and
|
|
the `AC_DEFINE' when you adjust the code.])
|
|
AC_CHECK_MEMBERS([struct stat.st_blksize],
|
|
[AC_DEFINE(HAVE_ST_BLKSIZE, 1,
|
|
[Define if your `struct stat' has
|
|
`st_blksize'. Deprecated, use
|
|
`HAVE_STRUCT_STAT_ST_BLKSIZE' instead.])])
|
|
])# AC_STRUCT_ST_BLKSIZE
|
|
|
|
|
|
# AC_STRUCT_ST_BLOCKS
|
|
# -------------------
|
|
# If `struct stat' contains an `st_blocks' member, define
|
|
# HAVE_STRUCT_STAT_ST_BLOCKS. Otherwise, add `fileblocks.o' to the
|
|
# output variable LIBOBJS. We still define HAVE_ST_BLOCKS for backward
|
|
# compatibility. In the future, we will activate specializations for
|
|
# this macro, so don't obsolete it right now.
|
|
#
|
|
# AC_OBSOLETE([$0], [; replace it with
|
|
# AC_CHECK_MEMBERS([struct stat.st_blocks],
|
|
# [AC_LIBOBJ([fileblocks])])
|
|
# Please note that it will define `HAVE_STRUCT_STAT_ST_BLOCKS',
|
|
# and not `HAVE_ST_BLOCKS'.])dnl
|
|
#
|
|
AC_DEFUN([AC_STRUCT_ST_BLOCKS],
|
|
[AC_CHECK_MEMBERS([struct stat.st_blocks],
|
|
[AC_DEFINE(HAVE_ST_BLOCKS, 1,
|
|
[Define if your `struct stat' has
|
|
`st_blocks'. Deprecated, use
|
|
`HAVE_STRUCT_STAT_ST_BLOCKS' instead.])],
|
|
[AC_LIBOBJ([fileblocks])])
|
|
])# AC_STRUCT_ST_BLOCKS
|
|
|
|
|
|
# AC_STRUCT_ST_RDEV
|
|
# -----------------
|
|
AU_DEFUN([AC_STRUCT_ST_RDEV],
|
|
[AC_DIAGNOSE([obsolete], [$0:
|
|
your code should no longer depend upon `HAVE_ST_RDEV', but
|
|
`HAVE_STRUCT_STAT_ST_RDEV'. Remove this warning and
|
|
the `AC_DEFINE' when you adjust the code.])
|
|
AC_CHECK_MEMBERS([struct stat.st_rdev],
|
|
[AC_DEFINE(HAVE_ST_RDEV, 1,
|
|
[Define if your `struct stat' has `st_rdev'.
|
|
Deprecated, use `HAVE_STRUCT_STAT_ST_RDEV'
|
|
instead.])])
|
|
])# AC_STRUCT_ST_RDEV
|
|
|
|
|
|
# AC_STRUCT_TM
|
|
# ------------
|
|
# FIXME: This macro is badly named, it should be AC_CHECK_TYPE_STRUCT_TM.
|
|
# Or something else, but what? AC_CHECK_TYPE_STRUCT_TM_IN_SYS_TIME?
|
|
AC_DEFUN([AC_STRUCT_TM],
|
|
[AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h],
|
|
ac_cv_struct_tm,
|
|
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
|
|
#include <time.h>
|
|
],
|
|
[struct tm *tp; tp->tm_sec;])],
|
|
[ac_cv_struct_tm=time.h],
|
|
[ac_cv_struct_tm=sys/time.h])])
|
|
if test $ac_cv_struct_tm = sys/time.h; then
|
|
AC_DEFINE(TM_IN_SYS_TIME, 1,
|
|
[Define if your <sys/time.h> declares `struct tm'.])
|
|
fi
|
|
])# AC_STRUCT_TM
|
|
|
|
|
|
# AC_STRUCT_TIMEZONE
|
|
# ------------------
|
|
# Figure out how to get the current timezone. If `struct tm' has a
|
|
# `tm_zone' member, define `HAVE_TM_ZONE'. Otherwise, if the
|
|
# external array `tzname' is found, define `HAVE_TZNAME'.
|
|
AC_DEFUN([AC_STRUCT_TIMEZONE],
|
|
[AC_REQUIRE([AC_STRUCT_TM])dnl
|
|
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
|
|
#include <$ac_cv_struct_tm>
|
|
])
|
|
if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
|
|
AC_DEFINE(HAVE_TM_ZONE, 1,
|
|
[Define if your `struct tm' has `tm_zone'. Deprecated, use
|
|
`HAVE_STRUCT_TM_TM_ZONE' instead.])
|
|
else
|
|
AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
|
|
[AC_TRY_LINK(
|
|
[#include <time.h>
|
|
#ifndef tzname /* For SGI. */
|
|
extern char *tzname[]; /* RS6000 and others reject char **tzname. */
|
|
#endif
|
|
],
|
|
[atoi(*tzname);], ac_cv_var_tzname=yes, ac_cv_var_tzname=no)])
|
|
if test $ac_cv_var_tzname = yes; then
|
|
AC_DEFINE(HAVE_TZNAME, 1,
|
|
[Define if you don't have `tm_zone' but do have the external
|
|
array `tzname'.])
|
|
fi
|
|
fi
|
|
])# AC_STRUCT_TIMEZONE
|