1# malloc.m4 serial 21 2dnl Copyright (C) 2007, 2009-2020 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 7# This is adapted with modifications from upstream Autoconf here: 8# https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c 9AC_DEFUN([_AC_FUNC_MALLOC_IF], 10[ 11 AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles 12 AC_CACHE_CHECK([for GNU libc compatible malloc], 13 [ac_cv_func_malloc_0_nonnull], 14 [AC_RUN_IFELSE( 15 [AC_LANG_PROGRAM( 16 [[#include <stdlib.h> 17 ]], 18 [[char *p = malloc (0); 19 int result = !p; 20 free (p); 21 return result;]]) 22 ], 23 [ac_cv_func_malloc_0_nonnull=yes], 24 [ac_cv_func_malloc_0_nonnull=no], 25 [case "$host_os" in 26 # Guess yes on platforms where we know the result. 27 *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \ 28 | hpux* | solaris* | cygwin* | mingw*) 29 ac_cv_func_malloc_0_nonnull="guessing yes" ;; 30 # If we don't know, obey --enable-cross-guesses. 31 *) ac_cv_func_malloc_0_nonnull="$gl_cross_guess_normal" ;; 32 esac 33 ]) 34 ]) 35 case "$ac_cv_func_malloc_0_nonnull" in 36 *yes) 37 $1 38 ;; 39 *) 40 $2 41 ;; 42 esac 43])# _AC_FUNC_MALLOC_IF 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. 49AC_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. 66AC_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. 80AC_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 __CYGWIN__ 92 choke me 93 #endif 94 ]])], 95 [gl_cv_func_malloc_posix=yes], 96 [gl_cv_func_malloc_posix=no]) 97 ]) 98]) 99