1# realloc.m4 serial 14 2dnl Copyright (C) 2007, 2009-2017 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_REALLOC_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 realloc], 17 [ac_cv_func_realloc_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 *realloc (); 24 #endif 25 ]], 26 [[char *p = realloc (0, 0); 27 int result = !p; 28 free (p); 29 return result;]]) 30 ], 31 [ac_cv_func_realloc_0_nonnull=yes], 32 [ac_cv_func_realloc_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_realloc_0_nonnull=yes ;; 38 # If we don't know, assume the worst. 39 *) ac_cv_func_realloc_0_nonnull=no ;; 40 esac 41 ]) 42 ]) 43 AS_IF([test $ac_cv_func_realloc_0_nonnull = yes], [$1], [$2]) 44])# AC_FUNC_REALLOC 45 46]) 47 48# gl_FUNC_REALLOC_GNU 49# ------------------- 50# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace 51# realloc if it is not. 52AC_DEFUN([gl_FUNC_REALLOC_GNU], 53[ 54 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 55 dnl _AC_FUNC_REALLOC_IF is defined in Autoconf. 56 _AC_FUNC_REALLOC_IF( 57 [AC_DEFINE([HAVE_REALLOC_GNU], [1], 58 [Define to 1 if your system has a GNU libc compatible 'realloc' 59 function, and to 0 otherwise.])], 60 [AC_DEFINE([HAVE_REALLOC_GNU], [0]) 61 REPLACE_REALLOC=1 62 ]) 63])# gl_FUNC_REALLOC_GNU 64 65# gl_FUNC_REALLOC_POSIX 66# --------------------- 67# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it 68# fails), and replace realloc if it is not. 69AC_DEFUN([gl_FUNC_REALLOC_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_REALLOC_POSIX], [1], 75 [Define if the 'realloc' function is POSIX compliant.]) 76 else 77 REPLACE_REALLOC=1 78 fi 79]) 80