What steps will reproduce the problem?

Note that you have to run the build repeatedly to be guaranteed to see the problem.

$ go build .
# foo
inconsistent definitions for C.A
$ go build .
# foo
inconsistent definitions for C.A
$ go build .
# foo
inconsistent definitions for C.A
$ go build .
# foo
inconsistent definitions for C.A
$ go build .
# foo
inconsistent definitions for C.A
$ go build .
# foo
inconsistent definitions for C.A
$ go build .
$ go build .
$ go build .
# foo
inconsistent definitions for C.A

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')

e4b20018f797

Please provide any additional information below.

gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)

GNU ld version 2.21.53.0.1-6.fc16 20110716

Attachments:

1. a.go (81 bytes)
2. b.go (88 bytes)
3. foo.h (91 bytes)