[Bug 1586872] [NEW] gccgo: -buildmode=shared and cgo don't work together

[Michael Hudson-Doyle]

Public bug reported:

As seen at
https://launchpad.net/~mwhudson/+archive/ubuntu/devirt/+build/9828197,
this combination fails to build:

/usr/bin/gccgo-6 -o $WORK/libgithub.com-gosexy-gettext.so -shared -nostdlib -zdefs -Wl,--whole-archive /«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a -Wl,--no-whole-archive -shared -nostdlib -lgo -lgcc_s -lgcc -lc -Wl,-soname=libgolang-github-gosexy-gettext.so.1 -Wl,-znow -fPIC
# /tmp/go-build671164651/libgithub.com-gosexy-gettext.so
/«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a: member /«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a(_cgo_flags) in archive is not an object
collect2: error: ld returned 1 exit status

I've reported this upstream (https://github.com/golang/go/issues/15885)
and hacked up a fix while I'll attach in a moment.

** Affects: gcc-6 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1586872

Title:
  gccgo: -buildmode=shared and cgo don't work together

Status in gcc-6 package in Ubuntu:
  New

Bug description:
  As seen at
  https://launchpad.net/~mwhudson/+archive/ubuntu/devirt/+build/9828197,
  this combination fails to build:

  /usr/bin/gccgo-6 -o $WORK/libgithub.com-gosexy-gettext.so -shared -nostdlib -zdefs -Wl,--whole-archive /«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a -Wl,--no-whole-archive -shared -nostdlib -lgo -lgcc_s -lgcc -lc -Wl,-soname=libgolang-github-gosexy-gettext.so.1 -Wl,-znow -fPIC
  # /tmp/go-build671164651/libgithub.com-gosexy-gettext.so
  /«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a: member /«PKGBUILDDIR»/obj-powerpc-linux-gnu/pkg/gccgo_linux_ppc_fPIC/github.com/gosexy/libgettext.a(_cgo_flags) in archive is not an object
  collect2: error: ld returned 1 exit status

  I've reported this upstream
  (https://github.com/golang/go/issues/15885) and hacked up a fix while
  I'll attach in a moment.

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