[Bug sanitizer/94328] New: Logging of defects to file does not work with Asan and Ubsan combined

[gmc at synopsys dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94328

            Bug ID: 94328
           Summary: Logging of defects to file does not work with Asan and
                    Ubsan combined
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gmc at synopsys dot com
                CC: dodji at gcc dot gnu.org, dvyukov 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: ---

Created attachment 48114
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48114&action=edit
Source code for testcase

Compile only with the Address Sanitizer, and the resulting exe can log its
defects to file via the log_path setting in ASAN_OPTIONS

Ditto for only the Undefined Sanitizer, and using the log_path in UBSAN_OPTIONS

Combine the 2 though (the only 2 sanitizers that do seem to be allowed to
coexist) and the logging does not seem to work correctly : ASAN_OPTIONS seems
to be ignored altogether - and when I set UBSAN_OPTIONS the designated log_path
is used ONLY for the Address Sanitizer (incl LeakSanitizer) defects - the
Undefined Behavior defects go only to stderr, not to the log file.

See attached files : "test.cx" is the source, "make all" builds 3 exes, "run"
runs each, with log_path being set via the *_OPTIONS settings

Thanks for any help in addressing this.

   Gordon