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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/63939] [5 Regression] Massive asan failures (356) on darwin
Date: Wed, 19 Nov 2014 17:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63939

--- Comment #14 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> (1) I don't understand what has changed to explain the failures.

I still don't know what change between r217514 and r217602 caused it but the
reason is that there is now two spaces instead of one in the outputs of the
kind:

#0 0x66d09  ( ...

Thus the failures are gone if the original pattern '\[(\])' is replaced with '
\[(\])'. In order to keep some backward compatibility I have replaced '\[(\])'
with ' ?\[(\])' and the failures are gone (I'll attach a new patch ASAP).

> I got the latest LLVM here: http://llvm.org/releases/download.html#3.5
> (Clang for Darwin 10.9) and put llvm-symbolizer in my PATH.

Thanks for the pointer.

> With that, and with my patch under review
> (https://gcc.gnu.org/ml/gcc-patches/2014-11/msg02465.html),
> I am down to one failure: strncpy-overflow-1.c

Try

--- ../_clean/gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c   
2014-05-10 23:12:04.000000000 +0200
+++ gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c    2014-11-19
16:38:31.000000000 +0100
@@ -1,5 +1,6 @@
 /* { dg-do run } */
 /* { dg-options "-fno-builtin-malloc -fno-builtin-strncpy" } */
+/* { dg-additional-options "-D_FORTIFY_SOURCE=0" { target *-*-darwin* } } */
 /* { dg-shouldfail "asan" } */

 #include <string.h>