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[Bug sanitizer/60649] New: [ASAN] Bogus "'y' may be used uninitialized" warning (affects bootstrap-asan)


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60649

            Bug ID: 60649
           Summary: [ASAN] Bogus "'y' may be used uninitialized" warning
                    (affects bootstrap-asan)
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: build, diagnostic
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus 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

Created attachment 32446
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32446&action=edit
C++ Test case (test.ii); compile as: g++ -O2 -fsanitize=address
-Werror=maybe-uninitialized test.ii

The following issue prevents bootstrapping GCC with
--with-build-config=bootstrap-asan: gcc/explow.c:83:7: error: y may be used
uninitialized in this function


The reduced test case compiles warning free without ASAN, but with ASAN one
gets:


$ g++ -O2 -fsanitize=address -Werror=maybe-uninitialized test12.ii
test12.ii: In function ârtx_def* plus_constant(machine_mode, rtx, long int)â:
test12.ii:22:7: error: âyâ may be used uninitialized in this function
[-Werror=maybe-uninitialized]
   rtx y;
       ^
cc1plus: some warnings being treated as errors

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