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101 lines
3.3 KiB
101 lines
3.3 KiB
# malloc.m4 serial 15 |
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dnl Copyright (C) 2007, 2009-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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m4_version_prereq([2.70], [] ,[ |
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# This is adapted with modifications from upstream Autoconf here: |
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# http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c |
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AC_DEFUN([_AC_FUNC_MALLOC_IF], |
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[ |
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AC_REQUIRE([AC_HEADER_STDC])dnl |
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AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles |
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AC_CHECK_HEADERS([stdlib.h]) |
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AC_CACHE_CHECK([for GNU libc compatible malloc], |
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[ac_cv_func_malloc_0_nonnull], |
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[AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#if defined STDC_HEADERS || defined HAVE_STDLIB_H |
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# include <stdlib.h> |
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#else |
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char *malloc (); |
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#endif |
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]], |
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[[char *p = malloc (0); |
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int result = !p; |
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free (p); |
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return result;]]) |
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], |
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[ac_cv_func_malloc_0_nonnull=yes], |
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[ac_cv_func_malloc_0_nonnull=no], |
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[case "$host_os" in |
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# Guess yes on platforms where we know the result. |
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*-gnu* | freebsd* | netbsd* | openbsd* \ |
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| hpux* | solaris* | cygwin* | mingw*) |
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ac_cv_func_malloc_0_nonnull=yes ;; |
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# If we don't know, assume the worst. |
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*) ac_cv_func_malloc_0_nonnull=no ;; |
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esac |
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]) |
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]) |
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AS_IF([test $ac_cv_func_malloc_0_nonnull = yes], [$1], [$2]) |
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])# _AC_FUNC_MALLOC_IF |
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]) |
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# gl_FUNC_MALLOC_GNU |
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# ------------------ |
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# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if |
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# it is not. |
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AC_DEFUN([gl_FUNC_MALLOC_GNU], |
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[ |
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
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dnl _AC_FUNC_MALLOC_IF is defined in Autoconf. |
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_AC_FUNC_MALLOC_IF( |
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[AC_DEFINE([HAVE_MALLOC_GNU], [1], |
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[Define to 1 if your system has a GNU libc compatible 'malloc' |
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function, and to 0 otherwise.])], |
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[AC_DEFINE([HAVE_MALLOC_GNU], [0]) |
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REPLACE_MALLOC=1 |
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]) |
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]) |
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# gl_FUNC_MALLOC_POSIX |
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# -------------------- |
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# Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it |
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# fails), and replace malloc if it is not. |
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AC_DEFUN([gl_FUNC_MALLOC_POSIX], |
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[ |
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
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AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) |
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if test $gl_cv_func_malloc_posix = yes; then |
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AC_DEFINE([HAVE_MALLOC_POSIX], [1], |
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[Define if the 'malloc' function is POSIX compliant.]) |
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else |
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REPLACE_MALLOC=1 |
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fi |
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]) |
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# Test whether malloc, realloc, calloc are POSIX compliant, |
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# Set gl_cv_func_malloc_posix to yes or no accordingly. |
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AC_DEFUN([gl_CHECK_MALLOC_POSIX], |
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[ |
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AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant], |
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[gl_cv_func_malloc_posix], |
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[ |
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dnl It is too dangerous to try to allocate a large amount of memory: |
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dnl some systems go to their knees when you do that. So assume that |
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dnl all Unix implementations of the function are POSIX compliant. |
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AC_COMPILE_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[]], |
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[[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
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choke me |
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#endif |
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]])], |
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[gl_cv_func_malloc_posix=yes], |
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[gl_cv_func_malloc_posix=no]) |
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]) |
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])
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