[Bug sanitizer/87880] New: [9 regression] All macOS asan execution tests FAIL

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87880

            Bug ID: 87880
           Summary: [9 regression] All macOS asan execution tests FAIL
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                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, mikestump at comcast dot net
  Target Milestone: ---
            Target: *-*-apple-darwin*

Since the recent merge of libsanitizer from upstream, all asan execution tests
FAIL on Darwin (seen on Mac OS X 10.7, but the same issue is still present on
macOS 10.14):

FAIL: c-c++-common/asan/alloca_big_alignment.c   -O0  output pattern test
Output was:
dyld: Symbol not found: ___cxa_rethrow_primary_exception
  Referenced from:
/private/var/gcc/regression/trunk/10.7-gcc/build/x86_64-apple-darwin11.4.2/./libsanitizer/asan/.libs/libasan.5.dylib
  Expected in: flat namespace
 in
/private/var/gcc/regression/trunk/10.7-gcc/build/x86_64-apple-darwin11.4.2/./libsanitizer/asan/.libs/libasan.5.dylib

The merge introduced a new interceptor in asan/asan_interceptors.cc:

#if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION
INTERCEPTOR(void, __cxa_rethrow_primary_exception, void *a) {
  CHECK(REAL(__cxa_rethrow_primary_exception));
  __asan_handle_no_return();
  REAL(__cxa_rethrow_primary_exception)(a);
}
#endif

with ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION defined in
asan/asan_interceptors.h.  However, that function is only defined in libc++abi,
which is linked on macOS in LLVM compiler-rt, but not present in gcc.

I've hacked around this by disabling the interception inside my tree, but don't
know how to properly handle this.