[Bug 218330] [exp-run] Use the lang/gccX port(s) instead of lang/gcc for USE_GCC=yes

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218330

--- Comment #1 from Jan Beich <jbeich at FreeBSD.org> ---
Oh, nice! I've disliked gcc/g++ symlinks as GNU configure (i.e. from autoconf)
picks them up by default for out-of-ports builds. g++ implies libstdc++ which
either breaks build or runtime where libc++ is default. One of such projects is
Firefox. With this change using packages that depend on gccX and contributing
upstream is going to be easier.

Hopefully, not many ports have regressed to ignore CC/CXX/CPP since those
symlinks got introduced.

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