[Bug tree-optimization/19196] New: Confusing identifiers in diagnostics

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

Variables fabricated by tree-ssa passes get used in diagnostics instead
of those written by users in their codes.  That can lead to really confusing
diagnostics.  I noticed this wen compiling my own applications that I cannot
reduce to manageabe size.  The snippet below reproduces the basic problem,
but is too simplistic.  I hope a bugmaster would make it more complicated,
still manageable.

Consider
% cat sra-name.C                                              
struct A {
   int i;
   A() { }
};

int main()
{
   A a;
   return a.i;
}


Compiling the above with current mainline gives

% g++ -O2 -Wall -c sra-name.C                             
sra-name.C: In function 'int main()':
sra-name.C:8: warning: 'a$i' is used uninitialized in this function

Notice the "a$i" which should have been "a.i".

In my application, I get weird names like 'SR.20649', which looks definitely
dubious and confusing.

-- 
           Summary: Confusing identifiers in diagnostics
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gdr at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: native, target-independent


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19196