[Bug c++/56100] New: spurious -Wshadow warning with local variable in template class

["f dot heckenbach at fh-soft dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56100

             Bug #: 56100
           Summary: spurious -Wshadow warning with local variable in
                    template class
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: f.heckenbach@fh-soft.de


Created attachment 29268
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29268
Test case

Compiling the test case with "-Wshadow" gives:

shadow.cpp: In instantiation of 'void bar<T>::baz() [with T = int]':
shadow.cpp:4:17:   required from 'void bar<T>::qux() [with T = int]'
shadow.cpp:13:21:   required from here
shadow.cpp:6:21: warning: declaration of 'foo' shadows a global declaration
[-Wshadow]
shadow.cpp:9:5: warning: shadowed declaration is here [-Wshadow]

Observed with 4.4.6, 4.6.1 and 4.7.2.

Note: "private" is not necessary to trigger the warning, it's just there to
show it occurs even with "private".

The warning seems strange because the supposedly shadowed variable is declared
after the shadowing one. (I assume that's because of the processing done during
instantiation.) It's annoying because it means that an identifier used in a
template defined in some header, even in a local scope in a private method is
"poisoned" when used anywhere else with -Wshadow.