| # realloc.m4 serial 19 |
| dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| # This is adapted with modifications from upstream Autoconf here: |
| # https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c |
| AC_DEFUN([_AC_FUNC_REALLOC_IF], |
| [ |
| AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles |
| AC_CACHE_CHECK([for GNU libc compatible realloc], |
| [ac_cv_func_realloc_0_nonnull], |
| [AC_RUN_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#include <stdlib.h> |
| ]], |
| [[char *p = realloc (0, 0); |
| int result = !p; |
| free (p); |
| return result;]]) |
| ], |
| [ac_cv_func_realloc_0_nonnull=yes], |
| [ac_cv_func_realloc_0_nonnull=no], |
| [case "$host_os" in |
| # Guess yes on platforms where we know the result. |
| *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \ |
| | hpux* | solaris* | cygwin* | mingw*) |
| ac_cv_func_realloc_0_nonnull="guessing yes" ;; |
| # If we don't know, obey --enable-cross-guesses. |
| *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;; |
| esac |
| ]) |
| ]) |
| case "$ac_cv_func_realloc_0_nonnull" in |
| *yes) |
| $1 |
| ;; |
| *) |
| $2 |
| ;; |
| esac |
| ])# AC_FUNC_REALLOC |
| |
| # gl_FUNC_REALLOC_GNU |
| # ------------------- |
| # Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace |
| # realloc if it is not. |
| AC_DEFUN([gl_FUNC_REALLOC_GNU], |
| [ |
| AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| dnl _AC_FUNC_REALLOC_IF is defined in Autoconf. |
| _AC_FUNC_REALLOC_IF( |
| [AC_DEFINE([HAVE_REALLOC_GNU], [1], |
| [Define to 1 if your system has a GNU libc compatible 'realloc' |
| function, and to 0 otherwise.])], |
| [AC_DEFINE([HAVE_REALLOC_GNU], [0]) |
| REPLACE_REALLOC=1 |
| ]) |
| ])# gl_FUNC_REALLOC_GNU |
| |
| # gl_FUNC_REALLOC_POSIX |
| # --------------------- |
| # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it |
| # fails), and replace realloc if it is not. |
| AC_DEFUN([gl_FUNC_REALLOC_POSIX], |
| [ |
| AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| AC_REQUIRE([gl_CHECK_MALLOC_POSIX]) |
| if test $gl_cv_func_malloc_posix = yes; then |
| AC_DEFINE([HAVE_REALLOC_POSIX], [1], |
| [Define if the 'realloc' function is POSIX compliant.]) |
| else |
| REPLACE_REALLOC=1 |
| fi |
| ]) |