[Bug build/15476] New: utils.h "enum errors" forward declaration

["brobecker at gnat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15476

             Bug #: 15476
           Summary: utils.h "enum errors" forward declaration
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: brobecker@gnat.com
    Classification: Unclassified


gdb/utils.h contains a forward declaration of type "enum errors", and this
causes a build failure with old GCC compilers. I suspect the same is true of
non-GNU compiler, as enum forward declarations are a GNU extension.

Ref: http://www.sourceware.org/ml/gdb-patches/2013-04/msg00829.html

A fix was checked it at:
http://www.sourceware.org/ml/gdb-patches/2013-05/msg00522.html

This PR is to backport the patch to the GDB 7.6 branch.

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