https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99179
Bug ID: 99179
Summary: asan failures with -Os on x86_64-apple-darwin20
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: dominiq at lps dot ens.fr
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
iains at gcc dot gnu.org, jakub at gcc dot gnu.org, kcc at
gcc dot gnu.org,
marxin at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-apple-darwin20
Target: x86_64-apple-darwin20
Build: x86_64-apple-darwin20
The following asan tests fail with -Os on x86_64-apple-darwin20
FAIL: c-c++-common/asan/alloca_big_alignment.c -Os output pattern test
FAIL: c-c++-common/asan/alloca_detect_custom_size.c -Os output pattern test
FAIL: c-c++-common/asan/alloca_overflow_partial.c -Os output pattern test
FAIL: c-c++-common/asan/alloca_overflow_right.c -Os output pattern test
FAIL: c-c++-common/asan/alloca_underflow_left.c -Os output pattern test
With -Os the output is
WRITE of size 1 at 0x7ffee72a5f8a thread T0
#0 0x108959dfc in foo(int, int) alloca_big_alignment.c:10
#1 0x108959e3b in main alloca_big_alignment.c:15
while it is
WRITE of size 1 at 0x7ffeedd4ef8a thread T0
#0 0x101eb0def in foo(int, int) alloca_big_alignment.c:11
#1 0x101eb0e04 in main alloca_big_alignment.c:15
with the other options: alloca_big_alignment.c:10 versus
alloca_big_alignment.c:11
