[ANNOUNCE]: clang compiling ports

[Pan Tsu]

Roman Divacky <rdivacky at freebsd.org> writes:

> Flz@ just run an exp-build with CC=clang and CXX=clang++. The results can be
> seen here:
>
>         http://pointyhat.freebsd.org/errorlogs/amd64-9-exp-latest/
>
> A lot of these failures are trivial to fix (ie. not respecting CC setting, etc.)
> and prevent a lot of other ports from building.

Any extra libtool patches? I'm curious how did you work around ports/155157

  foo.o: relocation R_X86_64_PC32 against symbol `bar' can not be used when
  making a shared object; recompile with -fPIC

due to failing lt_cv_prog_compiler_pic_works check on clang warnings.