| # Check whether free (NULL) is supposed to work. |
| |
| # Copyright (C) 2003-2005, 2009-2020 Free Software Foundation, Inc. |
| # This file is free software; the Free Software Foundation |
| # gives unlimited permission to copy and/or distribute it, |
| # with or without modifications, as long as this notice is preserved. |
| |
| # Written by Paul Eggert. |
| |
| # We can't test for free (NULL) even at runtime, since it might |
| # happen to "work" for our test program, but not in general. So, be |
| # conservative and use feature tests for relatively modern hosts, |
| # where free (NULL) is known to work. This costs a bit of |
| # performance on some older hosts, but we can fix that later if |
| # needed. |
| |
| AC_DEFUN([gl_FUNC_FREE], |
| [ |
| AC_REQUIRE([AC_CANONICAL_HOST]) |
| AC_CACHE_CHECK([whether free (NULL) is known to work], |
| [gl_cv_func_free], |
| [case "$host_os" in |
| mingw*) gl_cv_func_free=yes ;; |
| *) |
| AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[@%:@include <unistd.h>]], |
| [[@%:@if _POSIX_VERSION < 199009L && \ |
| (defined unix || defined _unix || defined _unix_ \ |
| || defined __unix || defined __unix__) |
| @%:@error "'free (NULL)' is not known to work" |
| @%:@endif]])], |
| [gl_cv_func_free=yes], |
| [gl_cv_func_free=no]) |
| esac |
| ]) |
| |
| if test $gl_cv_func_free = no; then |
| AC_DEFINE([free], [rpl_free], |
| [Define to rpl_free if the replacement function should be used.]) |
| fi |
| ]) |
| |
| # Prerequisites of lib/free.c. |
| AC_DEFUN([gl_PREREQ_FREE], [:]) |
