[Bug 228205] [PATH] lang/gcc6: fail to build with -mretpoline

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228205

            Bug ID: 228205
           Summary: [PATH] lang/gcc6: fail to build with -mretpoline
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: rozhuk.im at gmail.com
             Flags: maintainer-feedback?(gerald at FreeBSD.org)
          Assignee: gerald at FreeBSD.org

Created attachment 193342
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193342&action=edit
patch: strip -mretpoline option

/etc/make.conf:
# Retpoline speculative execution vulnerability mitigation (CVE-2017-5715)
CFLAGS+=-mretpoline
CXXFLAGS+=-mretpoline
COPTFLAGS+=-mretpoline


...
checking for x86_64-portbld-freebsd11.2-gcc...
/tmp/ports/usr/ports/lang/gcc6/work/.build/./gcc/xgcc
-B/tmp/ports/usr/ports/lang/gcc6/work/.build/./gcc/
-B/usr/local/x86_64-portbld-freebsd11.2/bin/
-B/usr/local/x86_64-portbld-freebsd11.2/lib/ -isystem
/usr/local/x86_64-portbld-freebsd11.2/include -isystem
/usr/local/x86_64-portbld-freebsd11.2/sys-include   
checking for suffix of object files... configure: error: in
`/tmp/ports/usr/ports/lang/gcc6/work/.build/x86_64-portbld-freebsd11.2/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
gmake[4]: *** [Makefile:14944: configure-stage1-target-libgcc] Error 1
gmake[4]: Leaving directory '/tmp/ports/usr/ports/lang/gcc6/work/.build'
gmake[3]: *** [Makefile:21516: stage1-bubble] Error 2
gmake[3]: Leaving directory '/tmp/ports/usr/ports/lang/gcc6/work/.build'
gmake[2]: *** [Makefile:21848: bootstrap-lean] Error 2
gmake[2]: Leaving directory '/tmp/ports/usr/ports/lang/gcc6/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/gcc6

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