[Bug macros/9748] macros containing __extension__ won't run

["pedro at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From pedro at codesourcery dot com  2009-01-15 21:30 -------
Subject: Re:  New: macros containing __extension__ won't run

On Thursday 15 January 2009 21:06:26, rearnsha at gcc dot gnu dot org wrote:
> Consider a macro, such as the following (from GCC):
> 
> #define TREE_CHECK(T, CODE) __extension__ ({ __typeof (T) const __t = (T); if
> (TREE_CODE (__t) != (CODE)) tree_check_failed (__t, __FILE__, __LINE__,
> __FUNCTION__, (CODE), 0); __t; })
> 
> if the object containing the macro is compiled with -g3, then the definition is
> available to GDB, but this doesn't help much...
> 
> (gdb) p TREE_CHECK (fntype, CALL_EXPR)
> No symbol "__extension__" in current context.
> 

I current gdb mainline, you could try defining __extension__ to empty:

 (gdb) macro define __extension__

("macro define" was stubbed in yearlier versions of gdb, it
has only recently been implemented)

I guess you'd need to do the same for __FILE__, __LINE__, etc, but I
think you'll trip on __typeof.



-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=9748

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