[PATCH 2/2] Change macro_source_fullname to return a std::string

[Joel Brobecker]

> While working on the previous patch, I noticed that if
> macro_source_fullname returned a std::string, then the callers would
> be simplified.  This patch implements this idea.

Indeed!

> gdb/ChangeLog
> 2019-02-13  Tom Tromey  <tom@tromey.com>
> 
> 	* macrotab.h (macro_source_fullname): Return a std::string.
> 	* macrotab.c (macro_include, check_for_redefinition)
> 	(macro_undef, macro_lookup_definition, foreach_macro)
> 	(foreach_macro_in_scope): Update.
> 	(macro_source_fullname): Return a std::string.
> 	* macrocmd.c (show_pp_source_pos): Update.

The patch looks good also.

-- 
Joel