1 # realloc.m4 serial 13 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_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 [[return ! realloc (0, 0);]]) 27 ], 28 [ac_cv_func_realloc_0_nonnull=yes], 29 [ac_cv_func_realloc_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_realloc_0_nonnull=yes ;; 35 # If we don't know, assume the worst. 36 *) ac_cv_func_realloc_0_nonnull=no ;; 37 esac 38 ]) 39 ]) 40 AS_IF([test $ac_cv_func_realloc_0_nonnull = yes], [$1], [$2]) 41 ])# AC_FUNC_REALLOC 42 43 ]) 44 45 # gl_FUNC_REALLOC_GNU 46 # ------------------- 47 # Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace 48 # realloc if it is not. 49 AC_DEFUN([gl_FUNC_REALLOC_GNU], 50 [ 51 AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 52 dnl _AC_FUNC_REALLOC_IF is defined in Autoconf. 53 _AC_FUNC_REALLOC_IF( 54 [AC_DEFINE([HAVE_REALLOC_GNU], [1], 55 [Define to 1 if your system has a GNU libc compatible 'realloc' 56 function, and to 0 otherwise.])], 57 [AC_DEFINE([HAVE_REALLOC_GNU], [0]) 58 REPLACE_REALLOC=1 59 ]) 60 ])# gl_FUNC_REALLOC_GNU 61 62 # gl_FUNC_REALLOC_POSIX 63 # --------------------- 64 # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it 65 # fails), and replace realloc if it is not. 66 AC_DEFUN([gl_FUNC_REALLOC_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_REALLOC_POSIX], [1], 72 [Define if the 'realloc' function is POSIX compliant.]) 73 else 74 REPLACE_REALLOC=1 75 fi 76 ]) 77
