[Bug sanitizer/64013] New: [5 Regression] libsanitizer fails to build

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64013

            Bug ID: 64013
           Summary: [5 Regression] libsanitizer fails to build
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                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

[35101s] I: Program returns random data in a function
[35101s] E: gcc5 no-return-in-nonvoid-function
../../../../libsanitizer/sanitizer_common/sanitizer_linux.cc:295

bool FileExists(const char *filename) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
  struct stat st;
  if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
    return false;
#else
  struct stat st;
  if (internal_stat(filename, &st))
    return false;
  // Sanity check: filename is a regular file.
  return S_ISREG(st.st_mode);
#endif
}

the SANITIZER_USES_CANONICAL_LINUX_SYSCALLS misses a return.