[Bug regression/53203] New: [4.8 Regression]: gcc.dg/setjmp-1.c

[hp at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53203

             Bug #: 53203
           Summary: [4.8 Regression]: gcc.dg/setjmp-1.c
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: regression
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: h...@gcc.gnu.org
                CC: ber...@gcc.gnu.org
              Host: x86_64-unknown-linux-gnu
            Target: cris-axis-elf


Created attachment 27292
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27292
repeat with "cc1 -fpreprocessed setjmp-1.i -quiet -O -Wclobbered -Wextra -Wall
-fno-diagnostics-show-caret"

This test previously passed, now it fails.
A patch in the revision range (last_known_working:first_known_failing)
187015:187022
exposed or caused this regression.  Since then it fails as follows:

Running /tmp/hpautotest-gcc0/gcc/gcc/testsuite/gcc.dg/dg.exp ...
...
FAIL: gcc.dg/setjmp-1.c spurious clobbered warning (test for bogus messages,
line 16)

Lines in gcc.log:
/tmp/hpautotest-gcc0/gcc/gcc/testsuite/gcc.dg/setjmp-1.c: In function
'compare_float':
/tmp/hpautotest-gcc0/gcc/gcc/testsuite/gcc.dg/setjmp-1.c:16:23: warning:
argument 'a' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]
/tmp/hpautotest-gcc0/gcc/gcc/testsuite/gcc.dg/setjmp-1.c:16:33: warning:
argument 'b' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]

Author of suspect patch in revision range CC:ed.

Preprocessed setjmp-1.i attached; the regression might be related to the actual
target-specific setjmp implementation (though simple and non-surprising,
non-inline).