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authorAndy Wingo <wingo@pobox.com>2021-01-20 21:52:54 +0100
committerAndy Wingo <wingo@pobox.com>2021-01-20 23:03:56 +0100
commita91b95cca2d397c84f8b9bbd602d40209a7092ce (patch)
tree2c286a291f5a2b812d6e216be10936f2709d59cf /lib/free.c
parent758b31994cff582c7e8785b4cc2240dbf3573837 (diff)
downloadguile-a91b95cca2d397c84f8b9bbd602d40209a7092ce.tar.gz
Update Gnulib to v0.1-4379-g2ef5a9b4b
Also bump required autoconf version to 2.64, as required by Gnulib.
Diffstat (limited to 'lib/free.c')
-rw-r--r--lib/free.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/free.c b/lib/free.c
new file mode 100644
index 000000000..35872c848
--- /dev/null
+++ b/lib/free.c
@@ -0,0 +1,47 @@
+/* Make free() preserve errno.
+
+ Copyright (C) 2003, 2006, 2009-2021 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* written by Paul Eggert */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include <errno.h>
+
+void
+rpl_free (void *p)
+#undef free
+{
+#if defined __GNUC__ && !defined __clang__
+ /* An invalid GCC optimization
+ <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396>
+ would optimize away the assignments in the code below, when link-time
+ optimization (LTO) is enabled. Make the code more complicated, so that
+ GCC does not grok how to optimize it. */
+ int err[2];
+ err[0] = errno;
+ err[1] = errno;
+ errno = 0;
+ free (p);
+ errno = err[errno == 0];
+#else
+ int err = errno;
+ free (p);
+ errno = err;
+#endif
+}