Buildability status of lang/gcc5-aux and lang/gcc6-aux in FreeBSD-current?

What is the status of lang/gcc6-aux and lang/gcc5-aux regarding buildability in FreeBSD-current?

I read about these packages not building on current subsequent to ino64, but there was no BROKEN notice in the Makefiles.

I tried and failed on both: gcc5-aux directly and gcc6-aux as a dependency of ports-mgmt/synth.

I get error message (gcc6-aux):

mkdir -p ada/bldtools/sinfo
rm -f ada/bldtools/sinfo/sinfo.ads ada/bldtools/sinfo/sinfo.adb ada/bldtools/sinfo/xsinfo.adb ada/bldtools/sinfo/csinfo.adb
cp -p /BETA1/usr/ports/lang/gcc6-aux/work12/gcc-6-20170202/gcc/ada/sinfo.ads /BETA1/usr/ports/lang/gcc6-aux/work12/gcc-6-20170202/gcc/ada/sinfo.adb /BETA1/usr/ports/lang/gcc6-aux/work12/gcc-6-20170202/gcc/ada/xsinfo.adb /BETA1/usr/ports/lang/gcc6-aux/work12/gcc-6-20170202/gcc/ada/csinfo.adb ada/bldtools/sinfo
(cd ada/bldtools/sinfo; gnatmake -q xsinfo ; ./xsinfo sinfo.h )

raised STORAGE_ERROR : stack overflow or erroneous memory access
gmake[4]: *** [/BETA1/usr/ports/lang/gcc6-aux/work12/gcc-6-20170202/gcc/ada/Make-generated.in:45: ada/sinfo.h] Error 1
gmake[4]: Leaving directory '/BETA1/usr/ports/lang/gcc6-aux/work12/build/gcc'
gmake[3]: *** [Makefile:4128: all-gcc] Error 2
gmake[3]: Leaving directory '/BETA1/usr/ports/lang/gcc6-aux/work12/build'
gmake[2]: *** [Makefile:876: all] Error 2
gmake[2]: Leaving directory '/BETA1/usr/ports/lang/gcc6-aux/work12/build'
*** Error code 2

and similar error on gcc5-aux.

This means not only no support for Ada in FreeBSD-current, but also synth won't build.  Back to portmaster.

This message could have been posted to freebsd-ports, but the problem is specifc to freebsd-current as far as I know.

I succeeded building synth and gcc6-aux on stable/11, but synth proved unworkable, crashing the system most of the time.  That would merit a separate thread on freebsd-ports, not to be off-topic on freebsd-current.

Tom