Packages in GOROOT that don't use cgo will not be installed in
GOROOT/pkg, and will instead be cached as usual like other Go
packages.
- add a internal/buildinternal package to hold the identities of the
five packages that use cgo
- update dist's test code to do a go build std cmd before checking
staleness on builders. Because most of those packages no longer have
install locations, and have dependencies that don't either, the
packages need to be cached to not be stale.
- fix index_test to import packages with the path "." when preparing
the "want" values to compare the indexed data to. (the module index
matches the behavior of build.ImportDir, which always passes in "."
as the path.
- In both the index and go/build Importers, don't set
PkgObj for GOROOT packages which will no longer have install
targets. PkgTargetRoot will still be set to compute target paths,
which will still be needed in buildmode=shared.
- "downgrade" all install actions that don't have a target to build
actions. (The target should already not be set for packages that
shouldn't be installed).
For #47257
Change-Id: Ia5aee6b3b20b58e028119cf0352a4c4a2f10f6b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/432535
Run-TryBot: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Matloob <matloob@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com>