[Bug 216707] exp-run: Update lang/gcc from GCC 4.9 to GCC 5

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216707

--- Comment #24 from Jan Beich (mail not working) <jbeich at FreeBSD.org> ---
(In reply to Gerald Pfeifer from comment #22)
> Usually I would have expected this to be fixed with a _lower_ optimization level (so -O1),

Both -O1 and -O3 fix the hang but -O2 even manages to crash lang/gcc6 on i386.

gplc -c -C '-O2 -pipe  -fstack-protector -Wl,-rpath=/usr/local/lib/gcc6
-fno-strict-aliasing' machine.c
machine.c: In function 'Pl_M_Absolute_Path_Name':
machine.c:763:1: internal compiler error: Segmentation fault
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
compilation failed

(In reply to Gerald Pfeifer from comment #23)
> If you are open to help again, I'd prepare an update to GCC 6 relatively
> soon after the update to GCC 5 has gone in.

Yep, CC me. I'd like to drop bug 193528 workarounds and USE_GCC=yes ports
unblocked on aarch64 once 6.3.1 is out.

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