[Bug middle-end/47595] New: c-c++-common/uninit-17.c fails test for warnings when -fgraphite-identity enabled at -O2

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47595

           Summary: c-c++-common/uninit-17.c fails test for warnings when
                    -fgraphite-identity enabled at -O2
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: howarth@nitro.med.uc.edu


When -fgraphite-identity is enabled in gcc trunk at -O2 like the graphite
branch...

Index: gcc/opts.c
===================================================================
--- gcc/opts.c    (revision 169512)
+++ gcc/opts.c    (working copy)
@@ -459,6 +459,9 @@ static const struct default_options defa
     { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },

     /* -O2 optimizations.  */
+#ifdef HAVE_cloog
+    { OPT_LEVELS_2_PLUS, OPT_fgraphite_identity, NULL, 1 },
+#endif
     { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
     { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
     { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },

The failures...

FAIL: c-c++-common/uninit-17.c  (test for warnings, line 12)
FAIL: c-c++-common/uninit-17.c  (test for warnings, line 16)
FAIL: c-c++-common/uninit-17.c (test for excess errors)

occur. These are of the form...

Executing on host:
/sw/src/fink.build/gcc46-4.6.0-1000/darwin_objdir/gcc/testsuite/g++/../../g++
-B/sw/src/fink.build/gcc46-4.6.0-1000/darwin_objdir/gcc/testsuite/g++/../../
/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/gcc/testsuite/c-c++-common/uninit-17.c
 -nostdinc++
-I/sw/src/fink.build/gcc46-4.6.0-1000/darwin_objdir/x86_64-apple-darwin10.7.0/i386/libstdc++-v3/include/x86_64-apple-darwin10.7.0
-I/sw/src/fink.build/gcc46-4.6.0-1000/darwin_objdir/x86_64-apple-darwin10.7.0/i386/libstdc++-v3/include
-I/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/libstdc++-v3/libsupc++
-I/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/libstdc++-v3/include/backward
-I/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/libstdc++-v3/testsuite/util
-fmessage-length=0  -O2 -Wuninitialized -fno-ivopts  -S  -m32 -o uninit-17.s   
(timeout = 300)
/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/gcc/testsuite/c-c++-common/uninit-17.c:
In function 'void foobar(int, int*)':^M
/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/gcc/testsuite/c-c++-common/uninit-17.c:21:6:
warning: 'b' is used uninitialized in this function [-Wuninitialized]^M
output is:
/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/gcc/testsuite/c-c++-common/uninit-17.c:
In function 'void foobar(int, int*)':^M
/sw/src/fink.build/gcc46-4.6.0-1000/gcc-4.6-20110202/gcc/testsuite/c-c++-common/uninit-17.c:21:6:
warning: 'b' is used uninitialized in this function [-Wuninitialized]^M

FAIL: c-c++-common/uninit-17.c  (test for warnings, line 12)
FAIL: c-c++-common/uninit-17.c  (test for warnings, line 16)
FAIL: c-c++-common/uninit-17.c (test for excess errors)

and look similar to those in the fixed PR44738.