[Bug c/26411] New: -Wstrict-aliasing does not enable analysis

[acahalan at gmail dot com]

I have some code which is unsafe without -fno-strict-aliasing. I'd like to
clean up the code while still having it work OK. Thus, I specify both
-fno-strict-aliasing and -Wstrict-aliasing=2. I'm not getting the warnings.

I think this is a general problem for warnings. The documentation for the
warning options does not specify what optimization is needed to make them work,
and the compiler does not reject option combinations that cause options to be
useless.

In any case, I simply can't enable the optimization and still get a working
app.


-- 
           Summary: -Wstrict-aliasing does not enable analysis
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: acahalan at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26411