go/packages: handle ad-hoc overlays with sources outside modules

If a user runs a file= query for a source that doesn't exist,
and they are outside of a module, fill in the GoSources for the
empty package that go list returns, so the overlay can be applied.

Also add a hack for the case where go list can't determine the compiler
(gc or gccgo) a user is using because
    go list -f "{{context.Compiler}}" -- unsafe
doesn't work. If go list complains that a user is outside a module,
we'll give ourselves flexibility to guess things because there's
no right answer. So we'll guess that the compiler is gc.

Fixes golang/go#33482

Change-Id: I6a8aa0c617c4d803558389fb4272854245f59c5a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/189322
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
5 files changed
tree: 647304708e559ee6dd01c5cf9c3ef2250504b211
  1. benchmark/
  2. blog/
  3. cmd/
  4. container/
  5. cover/
  6. go/
  7. godoc/
  8. gopls/
  9. imports/
  10. internal/
  11. playground/
  12. present/
  13. refactor/
  14. .gitattributes
  15. .gitignore
  16. AUTHORS
  17. codereview.cfg
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. go.mod
  21. go.sum
  22. LICENSE
  23. PATENTS
  24. README.md
README.md

Go Tools

This subrepository holds the source for various packages and tools that support the Go programming language.

Some of the tools, godoc and vet for example, are included in binary Go distributions.

Others, including the Go guru and the test coverage tool, can be fetched with go get.

Packages include a type-checker for Go and an implementation of the Static Single Assignment form (SSA) representation for Go programs.

Download/Install

The easiest way to install is to run go get -u golang.org/x/tools/.... You can also manually git clone the repository to $GOPATH/src/golang.org/x/tools.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the tools repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/tools/(your subdir):” in the subject line, so it is easy to find.