[MacPorts] #51795: libgcc @6.1.0: build fails with nm error

[MacPorts]

#51795: libgcc @6.1.0: build fails with nm error
-----------------------------+--------------------------------
 Reporter:  md14-macports@…  |      Owner:  macports-tickets@…
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.3.4
 Keywords:                   |       Port:  libgcc
-----------------------------+--------------------------------
 Building the libgcc port fails with the following error. The problem might
 be related to the recent upgrades to cctools 886, ld64-latest @264.3.102,
 or libmacho-headers 886.

 {{{
 $ sudo port -vs install libgcc
 ...
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc6/libgcc/work/build/./gcc/xgcc
 -B/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc6/libgcc/work/build/./gcc/
 -B/opt/local/x86_64-apple-darwin15/bin/ -B/opt/local/x86_64-apple-
 darwin15/lib/ -isystem /opt/local/x86_64-apple-darwin15/include -isystem
 /opt/local/x86_64-apple-darwin15/sys-include    -O2  -g -O2 -pipe -Os
 -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-
 format -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
 -isystem ./include   -pipe -fno-common -g -DIN_LIBGCC2 -fbuilding-libgcc
 -fno-stack-protector  -dynamiclib -nodefaultlibs -install_name
 /opt/local/lib/libgcc/libgcc_s.1.dylib -single_module -o ./libgcc_s.dylib
 -Wl,-exported_symbols_list,libgcc.map -compatibility_version 1
 -current_version 1.0 -g -O2 -pipe -Os -B./ _muldi3_s.o _negdi2_s.o
 _lshrdi3_s.o _ashldi3_s.o _ashrdi3_s.o _cmpdi2_s.o _ucmpdi2_s.o
 _clear_cache_s.o _trampoline_s.o __main_s.o _absvsi2_s.o _absvdi2_s.o
 _addvsi3_s.o _addvdi3_s.o _subvsi3_s.o _subvdi3_s.o _mulvsi3_s.o
 _mulvdi3_s.o _negvsi2_s.o _negvdi2_s.o _ctors_s.o _ffssi2_s.o _ffsdi2_s.o
 _clz_s.o _clzsi2_s.o _clzdi2_s.o _ctzsi2_s.o _ctzdi2_s.o _popcount_tab_s.o
 _popcountsi2_s.o _popcountdi2_s.o _paritysi2_s.o _paritydi2_s.o
 _powisf2_s.o _powidf2_s.o _powixf2_s.o _powitf2_s.o _mulsc3_s.o
 _muldc3_s.o _mulxc3_s.o _multc3_s.o _divsc3_s.o _divdc3_s.o _divxc3_s.o
 _divtc3_s.o _bswapsi2_s.o _bswapdi2_s.o _clrsbsi2_s.o _clrsbdi2_s.o
 _fixunssfsi_s.o _fixunsdfsi_s.o _fixunsxfsi_s.o _fixsfdi_s.o _fixdfdi_s.o
 _fixxfdi_s.o _fixunssfdi_s.o _fixunsdfdi_s.o _fixunsxfdi_s.o
 _floatdisf_s.o _floatdidf_s.o _floatdixf_s.o _floatundisf_s.o
 _floatundidf_s.o _floatundixf_s.o _fixsfti_s.o _fixdfti_s.o _fixxfti_s.o
 _fixtfti_s.o _fixunssfti_s.o _fixunsdfti_s.o _fixunsxfti_s.o
 _fixunstfti_s.o _floattisf_s.o _floattidf_s.o _floattixf_s.o
 _floattitf_s.o _floatuntisf_s.o _floatuntidf_s.o _floatuntixf_s.o
 _floatuntitf_s.o _divdi3_s.o _moddi3_s.o _udivdi3_s.o _umoddi3_s.o
 _udiv_w_sdiv_s.o _udivmoddi4_s.o darwin-64_s.o cpuinfo_s.o sfp-
 exceptions_s.o addtf3_s.o divtf3_s.o eqtf2_s.o getf2_s.o letf2_s.o
 multf3_s.o negtf2_s.o subtf3_s.o unordtf2_s.o fixtfsi_s.o fixunstfsi_s.o
 floatsitf_s.o floatunsitf_s.o fixtfdi_s.o fixunstfdi_s.o floatditf_s.o
 floatunditf_s.o fixtfti_s.o fixunstfti_s.o floattitf_s.o floatuntitf_s.o
 extendsftf2_s.o extenddftf2_s.o extendxftf2_s.o trunctfsf2_s.o
 trunctfdf2_s.o trunctfxf2_s.o enable-execute-stack_s.o unwind-dw2_s.o
 unwind-dw2-fde-darwin_s.o unwind-sjlj_s.o unwind-c_s.o emutls_s.o libgcc.a
 -lc
 ld: warning: could not create compact unwind for __Unwind_RaiseException:
 non-standard register 0 being saved in prolog
 ld: warning: could not create compact unwind for __Unwind_ForcedUnwind:
 non-standard register 0 being saved in prolog
 ld: warning: could not create compact unwind for __Unwind_Resume: does not
 use RBP or RSP based frame
 ld: warning: could not create compact unwind for
 __Unwind_Resume_or_Rethrow: non
 -standard register 0 being saved in prolog
 collect2: fatal error:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc6/libgcc/work/build/./gcc/nm
 returned 2 exit status
 compilation terminated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/51795>
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