diff options
Diffstat (limited to 'gnulib/import/free.c')
-rw-r--r-- | gnulib/import/free.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/gnulib/import/free.c b/gnulib/import/free.c new file mode 100644 index 0000000..5c89787 --- /dev/null +++ b/gnulib/import/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 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 General Public License for more details. + + You should have received a copy of the GNU 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 +} |