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authorJim Meyering <jim@meyering.net>2003-11-05 22:47:37 +0000
committerJim Meyering <jim@meyering.net>2003-11-05 22:47:37 +0000
commit2397cca268daadab9b69f9ffba42bbcc08264034 (patch)
tree88104b296580e136dd769418aca2ce910f52e2e8
parent77697dc7981e7eebd28ce09d8d386dd29f215d99 (diff)
downloadcoreutils-2397cca268daadab9b69f9ffba42bbcc08264034.tar.xz
*** empty log message ***
-rw-r--r--m4/ChangeLog5
-rw-r--r--m4/free.m446
2 files changed, 51 insertions, 0 deletions
diff --git a/m4/ChangeLog b/m4/ChangeLog
index 244d5269e..b7cdaf48d 100644
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,5 +1,10 @@
2003-11-05 Jim Meyering <jim@meyering.net>
+ * jm-macros.m4 (jm_MACROS): Require gl_FUNC_FREE.
+ * free.m4: New file, from gnulib.
+
+ * exitfail.m4, host-os.m4, strndup.m4: Update from gnulib.
+
* jm-macros.m4 (jm_MACROS): Require autoconf-2.58.
(AC_LANG_SOURCE): Remove definition, now that we require autoconf-2.58.
diff --git a/m4/free.m4 b/m4/free.m4
new file mode 100644
index 000000000..537fb893e
--- /dev/null
+++ b/m4/free.m4
@@ -0,0 +1,46 @@
+# Check whether free (NULL) is supposed to work.
+
+# Copyright (C) 2003 Free Software Foundation, Inc.
+
+# This file is free software, distributed under the terms of the GNU
+# General Public License. As a special exception to the GNU General
+# Public License, this file may be distributed as part of a program
+# that contains a configuration script generated by Autoconf, under
+# the same distribution terms as the rest of that program.
+
+# 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_CHECK_HEADERS_ONCE(unistd.h)
+ AC_CACHE_CHECK([whether free (NULL) is known to work],
+ [gl_cv_func_free],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[@%:@if HAVE_UNISTD_H
+ @%:@include <unistd.h>
+ @%:@endif]],
+ [[@%:@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])])
+
+ if test $gl_cv_func_free = yes; then
+ AC_LIBOBJ(free)
+ 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], [:])