[Bug sanitizer/82825] New: [8 regression] Many libsanitizer tests FAIL: dyld: Symbol not found: ___lsan_default_options

["ro at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82825

            Bug ID: 82825
           Summary: [8 regression] Many libsanitizer tests FAIL: dyld:
                    Symbol not found: ___lsan_default_options
           Product: gcc
           Version: 8.0
            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
  Target Milestone: ---
              Host: x86_64-apple-darwin11.4.2
            Target: x86_64-apple-darwin11.4.2
             Build: x86_64-apple-darwin11.4.2

Since the import of libsanitizer from upstream r315899, many tests FAIL on 
Mac OS X 10.7/Darwin 11 like this:

FAIL: c-c++-common/asan/alloca_big_alignment.c   -O0  output pattern test, is
dyld: Symbol not found: ___lsan_default_options
  Referenced from:
/private/var/gcc/regression/trunk/10.7-gcc-32/build/i386-apple-darwin11.4.2/./libsanitizer/asan/.libs/libasan.5.dylib
  Expected in: flat namespace
 in
/private/var/gcc/regression/trunk/10.7-gcc-32/build/i386-apple-darwin11.4.2/./libsanitizer/asan/.libs/libasan.5.dylib
, should match WRITE of size 1 at 0x[0-9a-f]+ thread T0[^
[...]

This is obviously due to this change:

-#if (SANITIZER_LINUX || SANITIZER_WINDOWS) && !SANITIZER_GO
[...]
+// SANITIZER_SUPPORTS_WEAK_HOOKS means that we support real weak functions
that
+// will evaluate to a null pointer when not defined.
+#ifndef SANITIZER_SUPPORTS_WEAK_HOOKS
+#if (SANITIZER_LINUX || SANITIZER_MAC) && !SANITIZER_GO
 # define SANITIZER_SUPPORTS_WEAK_HOOKS 1
 #else
 # define SANITIZER_SUPPORTS_WEAK_HOOKS 0
 #endif
+#endif // SANITIZER_SUPPORTS_WEAK_HOOKS

The tests work e.g. on macOS 10.13/Darwin 17.

  Rainer