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annotate m4/alloca.m4 @ 9209:5a0294ce5372

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Track CVS Autoconf on AC_USE_SYSTEM_EXTENSIONS. * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Update to CVS Autoconf definition. * modules/euidaccess (Depends-on): Add extensions, for AC_USE_SYSTEM_EXTENSIONS with autoconf <= 2.59. * modules/fnmatch (Depends-on): Likewise. * modules/getaddrinfo (Depends-on): Likewise. * modules/getdelim (Depends-on): Likewise. * modules/getline (Depends-on): Likewise. * modules/getsubopt (Depends-on): Likewise. * modules/gettext (Depends-on): Likewise. * modules/group-member (Depends-on): Likewise. * modules/mbchar (Depends-on): Likewise. * modules/memmem (Depends-on): Likewise. * modules/mempcpy (Depends-on): Likewise. * modules/memrchr (Depends-on): Likewise. * modules/pagealign_alloc (Depends-on): Likewise. * modules/readutmp (Depends-on): Likewise. * modules/stpcpy (Depends-on): Likewise. * modules/stpncpy (Depends-on): Likewise. * modules/strchrnul (Depends-on): Likewise. * modules/strndup (Depends-on): Likewise. * modules/strsep (Depends-on): Likewise. * modules/strverscmp (Depends-on): Likewise. * modules/vasprintf (Depends-on): Likewise. * modules/wcwidth (Depends-on): Likewise. * m4/euidaccess.m4 (gl_FUNC_EUIDACCESS): AC_GNU_SOURCE will be obsolete in Autoconf 2.62; use AC_USE_SYSTEM_EXTENSIONS instead. * m4/fnmatch.m4 (gl_FUNC_FNMATCH_GNU): Likewise. * m4/getaddrinfo.m4 (gl_PREREQ_GETADDR_INFO): Likewise. * m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise. * m4/getline.m4 (gl_FUNC_GETLINE): Likewise. * m4/getsubopt.m4 (gl_FUNC_GETSUBOPT): Likewise. * m4/glob.m4 (gl_PREREQ_GLOB): Likewise. * m4/group-member.m4 (gl_FUNC_GROUP_MEMBER): Likewise. * m4/mbchar.m4 (gl_MBCHAR): Likewise. * m4/memmem.m4 (gl_FUNC_MEMMEM): Likewise. * m4/mempcpy.m4 (gl_FUNC_MEMPCPY): Likewise. * m4/memrchr.m4 (gl_FUNC_MEMRCHR): Likewise. * m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Likewise. * m4/pagealign_alloc.m4 (gl_PAGEALIGN_ALLOC): Likewise. * m4/readutmp.m4 (gl_READUTMP): Likewise. * m4/regex.m4 (gl_PREREQ_REGEX): Likewise. * m4/stpcpy.m4 (gl_FUNC_STPCPY): Likewise. * m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise. * m4/strchrnul.m4 (gl_FUNC_STRCHRNUL): Likewise. * m4/strndup.m4 (gl_FUNC_STRNDUP): Likewise. * m4/strnlen.m4 (gl_FUNC_STRNLEN): Likewise. * m4/strsep.m4 (gl_FUNC_STRSEP): Likewise. * m4/strverscmp.m4 (gl_FUNC_STRVERSCMP): Likewise. * m4/vasprintf.m4 (gl_PREREQ_VASPRINTF_H): Likewise. * m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise. * m4/lock.m4 (gl_LOCK_EARLY_BODY): Likewise, but provide fallback, so that lock.m4 can be used in gettext without extensions module.
author Eric Blake <ebb9@byu.net>
date Wed, 12 Sep 2007 15:59:57 +0000
parents 8c905c6c16a0
children d309fd90fbf3
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e2febe678452 * m4/alloca.m4 (gl_FUNC_ALLOCA): Use AC_CACHE_CHECK to avoid a
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1 # alloca.m4 serial 7
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2 dnl Copyright (C) 2002-2004, 2006 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_ALLOCA],
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8 [
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9 dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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10 AC_REQUIRE([AC_PROG_CPP])
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11 AC_REQUIRE([AC_PROG_EGREP])
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12
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13 AC_REQUIRE([AC_FUNC_ALLOCA])
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14 if test $ac_cv_func_alloca_works = no; then
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15 gl_PREREQ_ALLOCA
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16 fi
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17
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18 # Define an additional variable used in the Makefile substitution.
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19 if test $ac_cv_working_alloca_h = yes; then
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20 AC_CACHE_CHECK([for alloca as a compiler built-in], [gl_cv_rpl_alloca], [
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21 AC_EGREP_CPP([Need own alloca], [
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22 #if defined __GNUC__ || defined _AIX || defined _MSC_VER
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23 Need own alloca
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24 #endif
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25 ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no])
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26 ])
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27 if test $gl_cv_rpl_alloca = yes; then
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28 dnl OK, alloca can be implemented through a compiler built-in.
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29 AC_DEFINE([HAVE_ALLOCA], 1,
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30 [Define to 1 if you have 'alloca' after including <alloca.h>,
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31 a header that may be supplied by this distribution.])
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32 ALLOCA_H=alloca.h
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33 else
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34 dnl alloca exists as a library function, i.e. it is slow and probably
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35 dnl a memory leak. Don't define HAVE_ALLOCA in this case.
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36 ALLOCA_H=
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37 fi
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38 else
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39 ALLOCA_H=alloca.h
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40 fi
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41 AC_SUBST([ALLOCA_H])
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42
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43 AC_DEFINE(HAVE_ALLOCA_H, 1,
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44 [Define HAVE_ALLOCA_H for backward compatibility with older code
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45 that includes <alloca.h> only if HAVE_ALLOCA_H is defined.])
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46 ])
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47
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48 # Prerequisites of lib/alloca.c.
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49 # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
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50 AC_DEFUN([gl_PREREQ_ALLOCA], [:])