[Bug sanitizer/59148] FAIL: c-c++-common/asan/strncpy-overflow-1.c -O0 execution test on darwin13

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59148

--- Comment #6 from Jack Howarth <howarth at nitro dot med.uc.edu> ---
(In reply to Alexander Potapenko from comment #3)
> GCC emits calls to __strcpy_chk and __strncpy_chk in this test, which
> happens because of source fortification being on by default on Darwin.
> In Clang we're passing -D_FORTIFY_SOURCE=0 when compiling with
> -fsanitize=address.
> 
> I've checked that manually adding -D_FORTIFY_SOURCE=0 fixes
> strncpy-overflow-1.c
> 
> Jack, can you please make the changes in the GCC driver?

Yes, I can confirm that...

Index: gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c
===================================================================
--- gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c    (revision 205290)
+++ gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c    (working copy)
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-fno-builtin-malloc -fno-builtin-strncpy" } */
+/* { dg-options "-D_FORTIFY_SOURCE=0 -fno-builtin-malloc -fno-builtin-strncpy"
} */
 /* { dg-shouldfail "asan" } */

 #include <string.h>

suppresses the problem. I can also confirm with current llvm/compiler-rt/clang
3.4 branch that...

/sw/opt/llvm-3.4/bin/clang -fsanitize=address -g -fdiagnostics-color=never -O0
-fno-builtin-malloc -fno-builtin-strncpy -lm -m64 -D_FORTIFY_SOURCE=2 -o
./strncpy-overflow-1.exe strncpy-overflow-1.c 

also produces a binary that 'fails' by 'passing'.