libgcc-devel @6-20160421_0 build fails on OS X 10.10.5

[mopihopi]

Upgrading libgcc-devel to @6-20160421_0 on OS X 10.10.5 results in a build failure, using Xcode 7.2.1 Build version 7C1002.

--->  Computing dependencies for libgcc-devel
--->  Fetching archive for libgcc-devel
--->  Attempting to fetch libgcc-devel-6-20160421_0.darwin_14.x86_64.tbz2 from https://packages.macports.org/libgcc-devel
--->  Attempting to fetch libgcc-devel-6-20160421_0.darwin_14.x86_64.tbz2 from http://sea.us.packages.macports.org/macports/packages/libgcc-devel
--->  Attempting to fetch libgcc-devel-6-20160421_0.darwin_14.x86_64.tbz2 from http://lil.fr.packages.macports.org/libgcc-devel
--->  Fetching distfiles for libgcc-devel
--->  Attempting to fetch gcc-6-20160421.tar.bz2 from https://distfiles.macports.org/gcc6
--->  Attempting to fetch gcc-6-20160421.tar.bz2 from ftp://gcc.gnu.org/pub/gcc/snapshots/6-20160421/
--->  Verifying checksums for libgcc-devel                                           
--->  Extracting libgcc-devel
--->  Configuring libgcc-devel
--->  Building libgcc-devel
Error: org.macports.build for port libgcc-devel returned: command execution failed
Please see the log file for port libgcc-devel for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc6/libgcc-devel/main.log
Error: Unable to upgrade port: 1
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets

The same issue occurs on both the buildbot and locally.
​https://build.macports.org/builders/buildports-yosemite-x86_64/builds/9209/steps/compile/logs/stdio

...
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/auto-profile.o differs
gcc/bb-reorder.o differs
gcc/build/genconfig.o differs
gcc/build/genflags.o differs
gcc/build/genpeep.o differs
gcc/build/genrecog.o differs
gcc/build/vec.o differs
gcc/c/c-parser.o differs
gcc/c/c-typeck.o differs
gcc/cfganal.o differs
gcc/combine.o differs
gcc/cp/constexpr.o differs
gcc/dwarf2out.o differs
gcc/expmed.o differs
gcc/fixed-value.o differs
gcc/fortran/arith.o differs
gcc/fortran/resolve.o differs
gcc/fortran/trans-common.o differs
gcc/fwprop.o differs
gcc/graphite-scop-detection.o differs
gcc/ipa-cp.o differs
gcc/ipa-devirt.o differs
gcc/ipa-icf.o differs
gcc/ipa.o differs
gcc/lto-cgraph.o differs
gcc/postreload.o differs
gcc/recog.o differs
gcc/reload1.o differs
gcc/rtlanal.o differs
gcc/timevar.o differs
gcc/tree-cfg.o differs
gcc/tree-chkp-opt.o differs
gcc/tree-data-ref.o differs
gcc/tree-eh.o differs
gcc/tree-into-ssa.o differs
gcc/tree-parloops.o differs
gcc/tree-sra.o differs
gcc/tree-ssa-loop-ivopts.o differs
gcc/tree-ssa-pre.o differs
gcc/tree-ssa-structalias.o differs
gcc/tree-vect-loop-manip.o differs
gcc/tree.o differs
gcc/varasm.o differs
gcc/vec.o differs
libcpp/expr.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc6/libgcc-devel/work/build'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc6/libgcc-devel/work/build'
make: *** [bootstrap] Error 2
make: Leaving directory `/opt/local/var/macports/build/_opt_mports_dports_lang_gcc6/libgcc-devel/work/build'
Command failed:  cd "/opt/local/var/macports/build/_opt_mports_dports_lang_gcc6/libgcc-devel/work/build" && /usr/bin/make -j5 -w bootstrap 
Exit code: 2
Error: org.macports.build for port libgcc-devel returned: command execution failed

[dstrubbe (David Strubbe)]

Cc Me!