[Bug other/36901] New: pedwarn() + -pedantic-errors + -w (inhibit_warnings) should not emit errors

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

>From PR35637 but this is a general issue of the diagnostic machinery.

The problem is: -pedantic no warning, -pedantic-errors gives an
error. 

Explanation: The pedantic warning is in a system header, so it doesn't get
emitted. When using -pedantic-errors, it is an error, and errors are always
emitted.

Longer explanation: The problem is in
diagnostics.c (diagnostic_report_diagnostic) which checks only for DK_WARNING
if 
they should be inhibited (either because of -w or because location is within
system headers. However, pedwarn() is passing a DK_ERROR when -pedantic-errors
is enabled. 

One possible fix is that pedwarn() always passes a DK_WARNING type, while
-pedantic-errors reclassifies -pedantic warnings to emit errors. In other
words, -pedantic-errors would behave internally like -Werror=pedantic.


-- 
           Summary: pedwarn() + -pedantic-errors + -w (inhibit_warnings)
                    should not emit errors
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: manu at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36901