[cfe-dev] Get full source of multiple macro definitions using libtooling

[Manuel Klimek via cfe-dev]

On Mon, May 9, 2016 at 4:13 PM John Bartelme <bartelme at gmail.com> wrote:

> Thanks for the response.  As I alluded to in the opening paragraph I have
> thousands of legacy header files that are a various mix of linkages and
> interdependencies.  I have a need to strip out various structures and
> typedefs and all structures/enums etc. they depend on from these files and
> make just one small cohesive header.  I looked around a lot to try and see
> what various technologies I could leverage for this end and ultimately
> decided that libtooling would give me the best shot at it.  I was able to
> get everything pulled out except for the statements that have multiple
> macros as described earlier.  I’m using Lexer::getSourceText to access the
> source for the given range.  Perhaps there is a way to print out the source
> after it has already been preprocessed and macros expanded?  I’m very open
> to switching gears if it is believed there is an easier way to do this.
> Thanks, john
>
Ok, yea, in that case just running it past -E first seems like that might
make things considerably easier; generally, clang tries to preserve all the
macro expansion history, but in your case, it sounds like you'd actually
prefer a completely flat view.
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