[Bug exp/12941] New: Ignore __extension__ in the parser

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12941

           Summary: Ignore __extension__ in the parser
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: exp
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com


Actual:
(gdb) ptype ENUM_BITFIELD(address_class)
No symbol "__extension__" in current context.

Expected:
(gdb) ptype enum address_class
type = enum address_class {LOC_UNDEF, LOC_CONST, LOC_STATIC, LOC_REGISTER,
LOC_ARG, LOC_REF_ARG, LOC_REGPARM_ADDR, LOC_LOCAL, LOC_TYPEDEF, LOC_LABEL,
LOC_BLOCK, LOC_CONST_BYTES, LOC_UNRESOLVED, LOC_OPTIMIZED_OUT, LOC_COMPUTED}

This breaks usage of macros in -g3 builds.

(gdb) info macro ENUM_BITFIELD
[...]
#define ENUM_BITFIELD(TYPE) __extension__ enum TYPE


But for example ({...}) still cannot get be parsed.

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