[MacPorts] #54416: gcc8 draft port

[MacPorts]

#54416: gcc8 draft port
--------------------------+-----------------
  Reporter:  michaelld    |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gcc8         |
--------------------------+-----------------

Comment (by michaelld):

 Build error is:
 {{{
 :info:build make[3]: Entering directory
 `/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build/gcc'
 :info:build
 /opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /./prev-gcc/xg++
 -B/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /./prev-gcc/ -B/opt/local/x86_64-apple-darwin16/bin/ -nostdinc++
 -B/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/src/.libs
 -B/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/libsupc++/.libs  -isystem
 /opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/include/x86_64-apple-darwin16
 -isystem
 /opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/include  -isystem
 /opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/gcc-8-20170625/libstdc++-v3/libsupc++
 -L/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/src/.libs
 -L/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build
 /prev-x86_64-apple-darwin16/libstdc++-v3/libsupc++/.libs   -g -O2
 -gtoggle -DIN_GCC     -fno-exceptions -fno-rtti -fasynchronous-unwind-
 tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-
 format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-
 variadic-macros -Wno-overlength-strings -Werror -fno-common
 -DHAVE_CONFIG_H -DGENERATOR_FILE -fno-PIE -static-libstdc++ -static-libgcc
 -Wl,-no_pie  -o build/genmddeps \
 :info:build         build/genmddeps.o build/read-md.o build/errors.o
 .././libiberty/libiberty.a
 :info:build 0  0x1027692a0  __assert_rtn + 144
 :info:build 1  0x1027fcf33
 mach_o::relocatable::Parser<x86_64>::parse(mach_o::relocatable::ParserOptions
 const&) + 3195
 :info:build 2  0x1027f4a96
 mach_o::relocatable::Parser<x86_64>::parse(unsigned char const*, unsigned
 long long, char const*, long, ld::File::Ordinal,
 mach_o::relocatable::ParserOptions const&) + 342
 :info:build 3  0x10276bfb2
 ld::tool::InputFiles::makeFile(Options::FileInfo const&, bool) + 818
 :info:build 4  0x10276e907  ld::tool::InputFiles::parseWorkerThread() +
 495
 :info:build 5  0x7fffdc87593b  _pthread_body + 180
 :info:build 6  0x7fffdc875887  _pthread_body + 0
 :info:build A linker snapshot was created at:
 :info:build     /tmp/genmddeps-2017-06-02-190128.ld-snapshot
 :info:build ld: Assertion failed: (cfiStartsArray[i] !=
 cfiStartsArray[i-1]), function parse, file
 src/ld/parsers/macho_relocatable_file.cpp, line 1851.
 :info:build collect2: error: ld returned 1 exit status
 :info:build make[3]: *** [build/genmddeps] Error 1
 :info:build make[3]: Leaving directory
 `/opt/local/var/macports/build/_opt_sources_MacPorts_ports_github_macports_lang_gcc8/libgcc8/work/build/gcc'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54416#comment:1>
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