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List:       gcc
Subject:    Re: infrastructure to detect whether code originates from macro expansion
From:       Dodji Seketeli <dodji () seketeli ! org>
Date:       2013-11-29 15:46:22
Message-ID: 87zjonky7l.fsf () seketeli ! org
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Hello Robert,

Robert Schiele <rschiele@gmail.com> a écrit:

> in http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48778 Manuel
> López-Ibáñez mentioned that starting with gcc 4.7 there is supposed to
> be infrastructure to figure out for diagnostics whether the location
> of an error was created by macro expansion and that this can be used
> to disable a warning in that case.

Indeed.

> Can anyone point me to the name of a function/macro I should use to
> check that or another example in the code that already does this?

I think you want to use the function
linemap_location_from_macro_expansion_p() from libcpp/line-map.c.  The
pointer to struct line_maps set you pass is usually the global variable named
'line_table'.

> I mean I can see how maybe_unwind_expanded_macro_loc figures out
> whether it needs to unwind macro expansions but I am not sure whether
> this linemap_lookup/linemap_macro_expansion_map_p stuff is what I am
> supposed to use in the place where I check for the diagnostics to emit
> or whether there is a higher level abstraction of this functionality.

You are right, linemap_macro_expansion_map_p is a tad lower level than
what you want.

I hope this helps.

Cheers.

-- 
		Dodji
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