Code by Bernhard Voelker <mail@bernhard-voelker.de>.
* lib/free.c (rpl_free): Add alternative complicated code for GCC.
+2021-01-03 Bruno Haible <bruno@clisp.org>
+
+ free-posix: Work around GCC mis-optimization bug.
+ Code by Bernhard Voelker <mail@bernhard-voelker.de>.
+ * lib/free.c (rpl_free): Add alternative complicated code for GCC.
+
2021-01-02 Bruno Haible <bruno@clisp.org>
valgrind-tests: Disable valgrind if it would cause all tests to fail.
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
}