1 # malloc.m4 serial 14 2 dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 m4_version_prereq([2.70], [] ,[ 8 9 # This is taken from the following Autoconf patch: 10 # http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9 11 AC_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 [[return ! malloc (0);]]) 27 ], 28 [ac_cv_func_malloc_0_nonnull=yes], 29 [ac_cv_func_malloc_0_nonnull=no], 30 [case "$host_os" in 31 # Guess yes on platforms where we know the result. 32 *-gnu* | freebsd* | netbsd* | openbsd* \ 33 | hpux* | solaris* | cygwin* | mingw*) 34 ac_cv_func_malloc_0_nonnull=yes ;; 35 # If we don't know, assume the worst. 36 *) ac_cv_func_malloc_0_nonnull=no ;; 37 esac 38 ]) 39 ]) 40 AS_IF([test $ac_cv_func_malloc_0_nonnull = yes], [$1], [$2]) 41 ])# _AC_FUNC_MALLOC_IF 42 43 ]) 44 45 # gl_FUNC_MALLOC_GNU 46 # ------------------ 47 # Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if 48 # it is not. 49 AC_DEFUN([gl_FUNC_MALLOC_GNU], 50 [ 51 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 52 dnl _AC_FUNC_MALLOC_IF is defined in Autoconf. 53 _AC_FUNC_MALLOC_IF( 54 [AC_DEFINE([HAVE_MALLOC_GNU], [1], 55 [Define to 1 if your system has a GNU libc compatible 'malloc' 56 function, and to 0 otherwise.])], 57 [AC_DEFINE([HAVE_MALLOC_GNU], [0]) 58 REPLACE_MALLOC=1 59 ]) 60 ]) 61 62 # gl_FUNC_MALLOC_POSIX 63 # -------------------- 64 # Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it 65 # fails), and replace malloc if it is not. 66 AC_DEFUN([gl_FUNC_MALLOC_POSIX], 67 [ 68 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 69 AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) 70 if test $gl_cv_func_malloc_posix = yes; then 71 AC_DEFINE([HAVE_MALLOC_POSIX], [1], 72 [Define if the 'malloc' function is POSIX compliant.]) 73 else 74 REPLACE_MALLOC=1 75 fi 76 ]) 77 78 # Test whether malloc, realloc, calloc are POSIX compliant, 79 # Set gl_cv_func_malloc_posix to yes or no accordingly. 80 AC_DEFUN([gl_CHECK_MALLOC_POSIX], 81 [ 82 AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant], 83 [gl_cv_func_malloc_posix], 84 [ 85 dnl It is too dangerous to try to allocate a large amount of memory: 86 dnl some systems go to their knees when you do that. So assume that 87 dnl all Unix implementations of the function are POSIX compliant. 88 AC_COMPILE_IFELSE( 89 [AC_LANG_PROGRAM( 90 [[]], 91 [[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ 92 choke me 93 #endif 94 ]])], 95 [gl_cv_func_malloc_posix=yes], 96 [gl_cv_func_malloc_posix=no]) 97 ]) 98 ]) 99
