Before filing a bug, please check whether it has been fixed since the
latest release. Search the issue tracker and check that you're running the
latest version of Go:

Run "go version" and compare against
http://golang.org/doc/devel/release.html  If a newer version of Go exists,
install it and retry what you did to reproduce the problem.

Thanks.

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.

Attempt to compile the following:
http://play.golang.org/p/VOH5glwcTB


What is the expected output?
Executable program

What do you see instead?
# command-line-arguments
panic: runtime error: integer divide by zero
[signal 0x8 code=0x1 addr=0x41d114 pc=0x41d114]

goroutine 1 [running]:
main.(*Package).structType(0xf84007e000, 0xf84008c180, 0xf8400d9190, 0xc, 0xf840062201,
...)
    /usr/local/go/src/cmd/cgo/out.go:201 +0xda9
main.(*Package).writeOutputFunc(0xf84007e000, 0xf8400d32c8, 0xf84008c180,
0xa732500000005, 0xf84008c180, ...)
    /usr/local/go/src/cmd/cgo/out.go:403 +0x218
main.(*Package).writeOutput(0xf84007e000, 0xf84006ac60, 0x7fff47f93a39,
0x6570797400000006, 0x2fffffffff, ...)
    /usr/local/go/src/cmd/cgo/out.go:381 +0x866
main.main()
    /usr/local/go/src/cmd/cgo/main.go:261 +0xe40

goroutine 2 [syscall]:
created by runtime.main
    /usr/local/go/src/pkg/runtime/proc.c:221


Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
Linux

Which version are you using?  (run 'go version')
go version go1.0.3 (but confirmed crash on recent tip by minux)

Please provide any additional information below.
It seems that the alignment guessed by CGO for the struct with only bit fields in it is
0.  This is a problem if ever you are using a third party library that has types with
bit fields in it (even if you don't want to access those fields from your go code).