1*56bb7041Schristos# malloc.m4 serial 20 2*56bb7041Schristosdnl Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc. 3*56bb7041Schristosdnl This file is free software; the Free Software Foundation 4*56bb7041Schristosdnl gives unlimited permission to copy and/or distribute it, 5*56bb7041Schristosdnl with or without modifications, as long as this notice is preserved. 6*56bb7041Schristos 7*56bb7041Schristos# This is adapted with modifications from upstream Autoconf here: 8*56bb7041Schristos# https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c 9*56bb7041SchristosAC_DEFUN([_AC_FUNC_MALLOC_IF], 10*56bb7041Schristos[ 11*56bb7041Schristos AC_REQUIRE([AC_HEADER_STDC])dnl 12*56bb7041Schristos AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles 13*56bb7041Schristos AC_CHECK_HEADERS([stdlib.h]) 14*56bb7041Schristos AC_CACHE_CHECK([for GNU libc compatible malloc], 15*56bb7041Schristos [ac_cv_func_malloc_0_nonnull], 16*56bb7041Schristos [AC_RUN_IFELSE( 17*56bb7041Schristos [AC_LANG_PROGRAM( 18*56bb7041Schristos [[#if defined STDC_HEADERS || defined HAVE_STDLIB_H 19*56bb7041Schristos # include <stdlib.h> 20*56bb7041Schristos #else 21*56bb7041Schristos char *malloc (); 22*56bb7041Schristos #endif 23*56bb7041Schristos ]], 24*56bb7041Schristos [[char *p = malloc (0); 25*56bb7041Schristos int result = !p; 26*56bb7041Schristos free (p); 27*56bb7041Schristos return result;]]) 28*56bb7041Schristos ], 29*56bb7041Schristos [ac_cv_func_malloc_0_nonnull=yes], 30*56bb7041Schristos [ac_cv_func_malloc_0_nonnull=no], 31*56bb7041Schristos [case "$host_os" in 32*56bb7041Schristos # Guess yes on platforms where we know the result. 33*56bb7041Schristos *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \ 34*56bb7041Schristos | hpux* | solaris* | cygwin* | mingw*) 35*56bb7041Schristos ac_cv_func_malloc_0_nonnull="guessing yes" ;; 36*56bb7041Schristos # If we don't know, obey --enable-cross-guesses. 37*56bb7041Schristos *) ac_cv_func_malloc_0_nonnull="$gl_cross_guess_normal" ;; 38*56bb7041Schristos esac 39*56bb7041Schristos ]) 40*56bb7041Schristos ]) 41*56bb7041Schristos case "$ac_cv_func_malloc_0_nonnull" in 42*56bb7041Schristos *yes) 43*56bb7041Schristos $1 44*56bb7041Schristos ;; 45*56bb7041Schristos *) 46*56bb7041Schristos $2 47*56bb7041Schristos ;; 48*56bb7041Schristos esac 49*56bb7041Schristos])# _AC_FUNC_MALLOC_IF 50*56bb7041Schristos 51*56bb7041Schristos# gl_FUNC_MALLOC_GNU 52*56bb7041Schristos# ------------------ 53*56bb7041Schristos# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if 54*56bb7041Schristos# it is not. 55*56bb7041SchristosAC_DEFUN([gl_FUNC_MALLOC_GNU], 56*56bb7041Schristos[ 57*56bb7041Schristos AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 58*56bb7041Schristos dnl _AC_FUNC_MALLOC_IF is defined in Autoconf. 59*56bb7041Schristos _AC_FUNC_MALLOC_IF( 60*56bb7041Schristos [AC_DEFINE([HAVE_MALLOC_GNU], [1], 61*56bb7041Schristos [Define to 1 if your system has a GNU libc compatible 'malloc' 62*56bb7041Schristos function, and to 0 otherwise.])], 63*56bb7041Schristos [AC_DEFINE([HAVE_MALLOC_GNU], [0]) 64*56bb7041Schristos REPLACE_MALLOC=1 65*56bb7041Schristos ]) 66*56bb7041Schristos]) 67*56bb7041Schristos 68*56bb7041Schristos# gl_FUNC_MALLOC_POSIX 69*56bb7041Schristos# -------------------- 70*56bb7041Schristos# Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it 71*56bb7041Schristos# fails), and replace malloc if it is not. 72*56bb7041SchristosAC_DEFUN([gl_FUNC_MALLOC_POSIX], 73*56bb7041Schristos[ 74*56bb7041Schristos AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 75*56bb7041Schristos AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) 76*56bb7041Schristos if test $gl_cv_func_malloc_posix = yes; then 77*56bb7041Schristos AC_DEFINE([HAVE_MALLOC_POSIX], [1], 78*56bb7041Schristos [Define if the 'malloc' function is POSIX compliant.]) 79*56bb7041Schristos else 80*56bb7041Schristos REPLACE_MALLOC=1 81*56bb7041Schristos fi 82*56bb7041Schristos]) 83*56bb7041Schristos 84*56bb7041Schristos# Test whether malloc, realloc, calloc are POSIX compliant, 85*56bb7041Schristos# Set gl_cv_func_malloc_posix to yes or no accordingly. 86*56bb7041SchristosAC_DEFUN([gl_CHECK_MALLOC_POSIX], 87*56bb7041Schristos[ 88*56bb7041Schristos AC_CACHE_CHECK([whether malloc, realloc, calloc are POSIX compliant], 89*56bb7041Schristos [gl_cv_func_malloc_posix], 90*56bb7041Schristos [ 91*56bb7041Schristos dnl It is too dangerous to try to allocate a large amount of memory: 92*56bb7041Schristos dnl some systems go to their knees when you do that. So assume that 93*56bb7041Schristos dnl all Unix implementations of the function are POSIX compliant. 94*56bb7041Schristos AC_COMPILE_IFELSE( 95*56bb7041Schristos [AC_LANG_PROGRAM( 96*56bb7041Schristos [[]], 97*56bb7041Schristos [[#if defined _WIN32 && ! defined __CYGWIN__ 98*56bb7041Schristos choke me 99*56bb7041Schristos #endif 100*56bb7041Schristos ]])], 101*56bb7041Schristos [gl_cv_func_malloc_posix=yes], 102*56bb7041Schristos [gl_cv_func_malloc_posix=no]) 103*56bb7041Schristos ]) 104*56bb7041Schristos]) 105