From: Bastien Roucariès <ro...@debian.org>
According to https://bugs.llvm.org/show_bug.cgi?id=15495#c11
llvm need g type constraint
Signed-off-by: Bastien Roucariès <ro...@debian.org>
---
lib/explicit_bzero.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/lib/explicit_bzero.c b/lib/explicit_bzero.c
index 87fadba81a..71a1cca3b0 100644
--- a/lib/explicit_bzero.c
+++ b/lib/explicit_bzero.c
@@ -56,9 +56,19 @@ explicit_bzero (void *s, size_t len)
(void) memset_s (s, len, '\0', len);
#else
memset (s, '\0', len);
-# if defined __GNUC__ && !defined __clang__
- /* Compiler barrier. */
+# if defined __GNUC__
+/* Compiler barrier. */
+# if !defined __clang__
asm volatile ("" ::: "memory");
+# else
+ /* See https://bugs.llvm.org/show_bug.cgi?id=15495#c11
+ with asm("" ::: "memory") LLVM analyzes uses of 's'
+ and finds that the whole thing is dead and eliminates it.
+
+ Using g workarround this problem
+ */
+ __asm__ volatile("" : : "g"(s) : "memory");
+# endif
# endif
#endif
}
--
2.29.2
