What I did:

• have a project including cgo headers using ${SRCDIR}
• move that project to a new directory
• build

Result:

ld: warning: directory not found for option '-L/Users/josh/...redacted...

The redacted directory is the previous directory pointed to by the ${SRCDIR} directive in the cgo sources.

After a go clean -cache, the error disappeared.

I suspect that cmd/go's caching may be too effective here. It probably doesn't take into account the absolute path containing the project, but it may need to when the ${SRCDIR} cgo directive is present.

cc @bcmills @jayconrod