[Bug 1429872] [NEW] golang is not aware of architectures supported by gccgo

[Matthias Klose]

Public bug reported:

docker.io is now built on arm64 (see the ~doko/toolchain PPA). However
it now fails to build on the architectures where it is built by golang
(any version up to 1.4.2, as found in the same PPA).

In golang-pty, a file ztypes_arm64.go is added for the new architecture,
however this doesn't seem to be recognized as architecture specific
file.

then trying to build docker on i386, amd64 and armhf, you see:

---> Making bundle: dynbinary (in bundles/1.3.3/dynbinary)
# github.com/kr/pty
obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_arm64.go:8: _C_int redeclared in this block
        previous declaration at obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_386.go:7
obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_arm64.go:9: _C_uint redeclared in this block
        previous declaration at obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_386.go:8
obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_ppc.go:8: _C_int redeclared in this block
        previous declaration at obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_arm64.go:8
obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_ppc.go:9: _C_uint redeclared in this block
        previous declaration at obj-i686-linux-gnu/src/github.com/kr/pty/ztypes_arm64.go:9

marking the ztypes_arm64.go file with

// + build !amd64 !amd64p32 !386 !arm

doesn't help.

** Affects: docker.io (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: golang (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: golang-pty (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: golang (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: golang-pty (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1429872

Title:
  golang is not aware of architectures supported by gccgo

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