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cmd/go: avoid indexing GOROOT packages when the compiler is 'gccgo'

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The gccgo compiler does not load standard-library packages from
GOROOT/src, so we cannot load those packages from the GOROOT/src
index when using that compiler.

This fixes TestScript/gccgo_link_c (and perhaps other gccgo tests)
when a 'gccgo' executable is present. Unfortunately, only a few
builders caught the broken test because 'gccgo' is not installed
on most Go project builders (see #35786).

For #53577.
Fixes #53815.

Change-Id: I11a5cf6dbf4ac9893c4d02bd6ab7ef60f67b1e87
Reviewed-on: https://go-review.googlesource.com/c/go/+/417094
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Bryan C. Mills 2022-07-12 10:48:47 -04:00 committed by Bryan Mills
parent c2edb2c841
commit 5f5cae7200
2 changed files with 6 additions and 0 deletions
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3
src/cmd/go/internal/modindex/read.go
View File

@ -139,6 +139,9 @@ func GetPackage(modroot, pkgdir string) (*IndexPackage, error) {
if !errors.Is(err, errNotFromModuleCache) {
return nil, err
}
if cfg.BuildContext.Compiler == "gccgo" && str.HasPathPrefix(modroot, cfg.GOROOTsrc) {
return nil, err // gccgo has no sources for GOROOT packages.
}
return openIndexPackage(modroot, pkgdir)
}

3
src/go/build/build.go
View File

@ -715,6 +715,9 @@ func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Packa
tried.goroot = dir
}
if ctxt.Compiler == "gccgo" && goroot.IsStandardPackage(ctxt.GOROOT, ctxt.Compiler, path) {
// TODO(bcmills): Setting p.Dir here is misleading, because gccgo
// doesn't actually load its standard-library packages from this
// directory. See if we can leave it unset.
p.Dir = ctxt.joinPath(ctxt.GOROOT, "src", path)
p.Goroot = true
p.Root = ctxt.GOROOT