The change https://go-review.googlesource.com/14204 (revision 67faca7) from 2/11/2015 broke a few tests in all.bash when running with the binary export format enabled (which is disabled by default). Found using git bisect.

Specifically, it appears that tests that use relative import paths (as in test/fixedbugs/bug437.dir) fail:

$ cd $GOROOT/test/fixedbugs/bug437.dir
$ go tool compile -newexport one.go && go tool compile -newexport two.go && go tool compile x.go && go tool link x.o

leads to:

type./Users/gri/go/test/fixedbugs/bug437.dir/two.S2: go.importpath./Users/gri/go/test/fixedbugs/bug437.dir/two.: not defined
type./Users/gri/go/test/fixedbugs/bug437.dir/two.S2: undefined: go.importpath./Users/gri/go/test/fixedbugs/bug437.dir/two.

Removing the following change:

https://go-review.googlesource.com/#/c/14204/54/src/cmd/compile/internal/gc/go.y

and rebuild the compiler only and then run above test, it works.

However, removing the change won't build the system from scratch.

@michaelmatloob pointed me at https://go-review.googlesource.com/#/c/14204/49..51/src/cmd/compile/internal/gc/go.y which gives some context about the offending change.