Be more defensive: only enable the *CALL macros when using GCC on Linux, since we know the current definitions work there and have a positive effect. This closes SF bug #692878.
Be more defensive: only enable the *CALL macros when using GCC on
Linux, since we know the current definitions work there and have a
positive effect.
This closes SF bug #692878.

cgwalters/expat-git-mirror,cgwalters/expat-git-mirror,cgwalters/expat-git-mirror