1# malloc.m4 serial 15 2dnl Copyright (C) 2007, 2009-2016 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7m4_version_prereq([2.70], [] ,[ 8 9# This is adapted with modifications from upstream Autoconf here: 10# http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c 11AC_DEFUN([_AC_FUNC_MALLOC_IF], 12[ 13 AC_REQUIRE([AC_HEADER_STDC])dnl 14 AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles 15 AC_CHECK_HEADERS([stdlib.h]) 16 AC_CACHE_CHECK([for GNU libc compatible malloc], 17 [ac_cv_func_malloc_0_nonnull], 18 [AC_RUN_IFELSE( 19 [AC_LANG_PROGRAM( 20 [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H 21 # include <stdlib.h> 22 #else 23 char *malloc (); 24 #endif 25 ]], 26 [[char *p = malloc (0); 27 int result = !p; 28 free (p); 29 return result;]]) 30 ], 31 [ac_cv_func_malloc_0_nonnull=yes], 32 [ac_cv_func_malloc_0_nonnull=no], 33 [case "$host_os" in 34 # Guess yes on platforms where we know the result. 35 *-gnu* | freebsd* | netbsd* | openbsd* \ 36 | hpux* | solaris* | cygwin* | mingw*) 37 ac_cv_func_malloc_0_nonnull=yes ;; 38 # If we don't know, assume the worst. 39 *) ac_cv_func_malloc_0_nonnull=no ;; 40 esac 41 ]) 42 ]) 43 AS_IF([test $ac_cv_func_malloc_0_nonnull = yes], [$1], [$2]) 44])# _AC_FUNC_MALLOC_IF 45 46]) 47 48# gl_FUNC_MALLOC_GNU 49# ------------------ 50# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if 51# it is not. 52AC_DEFUN([gl_FUNC_MALLOC_GNU], 53[ 54 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 55 dnl _AC_FUNC_MALLOC_IF is defined in Autoconf. 56 _AC_FUNC_MALLOC_IF( 57 [AC_DEFINE([HAVE_MALLOC_GNU], [1], 58 [Define to 1 if your system has a GNU libc compatible 'malloc' 59 function, and to 0 otherwise.])], 60 [AC_DEFINE([HAVE_MALLOC_GNU], [0]) 61 REPLACE_MALLOC=1 62 ]) 63]) 64 65# gl_FUNC_MALLOC_POSIX 66# -------------------- 67# Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it 68# fails), and replace malloc if it is not. 69AC_DEFUN([gl_FUNC_MALLOC_POSIX], 70[ 71 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 72 AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) 73 if test $gl_cv_func_malloc_posix = yes; then 74 AC_DEFINE([HAVE_MALLOC_POSIX], [1], 75 [Define if the 'malloc' function is POSIX compliant.]) 76 else 77 REPLACE_MALLOC=1 78 fi 79]) 80 81# Test whether malloc, realloc, calloc are POSIX compliant, 82# Set gl_cv_func_malloc_posix to yes or no accordingly. 83AC_DEFUN([gl_CHECK_MALLOC_POSIX], 84[ 85 AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant], 86 [gl_cv_func_malloc_posix], 87 [ 88 dnl It is too dangerous to try to allocate a large amount of memory: 89 dnl some systems go to their knees when you do that. So assume that 90 dnl all Unix implementations of the function are POSIX compliant. 91 AC_COMPILE_IFELSE( 92 [AC_LANG_PROGRAM( 93 [[]], 94 [[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ 95 choke me 96 #endif 97 ]])], 98 [gl_cv_func_malloc_posix=yes], 99 [gl_cv_func_malloc_posix=no]) 100 ]) 101]) 102