golang is not aware of architectures supported by gccgo

[Matthias Klose]

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.

[Matthias Klose (doko)]

the "build" lines are whitespace sensitive, no space between the plus and build, and these lines must be followed by an empty line ...

[Matthias Klose (doko)]

now fixed in gccgo's library, and upstream in golang