[Bug 218164] lang/gcc5: Bootstrap comparison failure

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218164

            Bug ID: 218164
           Summary: lang/gcc5: Bootstrap comparison failure
           Product: Ports & Packages
           Version: Latest
          Hardware: sparc64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: phoe at openmailbox.org
                CC: freebsd-sparc64 at FreeBSD.org
                CC: freebsd-sparc64 at FreeBSD.org
          Assignee: gerald at FreeBSD.org
             Flags: maintainer-feedback?(gerald at FreeBSD.org)

I am attempting to compile gcc5 on FreeBSD 11.0-RELEASE-p2 on sparc64. 
The compilation fails during bootstrap comparison.

I attempted to compile gcc5 with the default system compiler (gcc 4.2.1) as
well as with gcc47 (which built normally); both give the same error.

...
...
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/fortran/simplify.o differs
gcc/cfgexpand.o differs
gcc/haifa-sched.o differs
gcc/sched-rgn.o differs
gcc/tree-ssa-dce.o differs
gcc/tree-ssa-loop-niter.o differs
gcc/tree-ssa-sccvn.o differs
libcpp/macro.o differs
libdecnumber/decimal128.o differs
libiberty/pic/sha1.o differs
sparc64-portbld-freebsd11.0/libgcc/_divdi3.o differs
sparc64-portbld-freebsd11.0/libstdc++-v3/src/c++11/sstream-inst.o differs
gmake[4]: *** [Makefile:19638: compare] Error 1
gmake[4]: Leaving directory '/usr/ports/lang/gcc5/work/.build'
gmake[3]: *** [Makefile:19618: stage3-bubble] Error 2
gmake[3]: Leaving directory '/usr/ports/lang/gcc5/work/.build'
gmake[2]: *** [Makefile:19692: bootstrap-lean] Error 2
gmake[2]: Leaving directory '/usr/ports/lang/gcc5/work/.build'
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/lang/gcc5
*** Error code 1

Stop.
make: stopped in /usr/ports/lang/gcc5

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