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cmd/go: fix link error for -coverpkg in GOPATH mode
If a generated test main package transitively depends on a main package, the main package will now always be rebuilt as a library and will not be compiled with '-p main'. This expands the fix for #30907, which only applied to packages with the BuildInfo set (main packages built in module mode). Linking multiple packages with BuildInfo caused link errors, but it appears these errors apply to some symbols in GOPATH mode. Fixes #34114 Change-Id: Ic1e53437942269a950dd7e45d163707922c92edd Reviewed-on: https://go-review.googlesource.com/c/go/+/195279 Run-TryBot: Jay Conrod <jayconrod@google.com> Reviewed-by: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -399,10 +399,13 @@ func recompileForTest(pmain, preal, ptest, pxtest *Package) {
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}
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}
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// Don't compile build info from a main package. This can happen
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// if -coverpkg patterns include main packages, since those packages
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// are imported by pmain. See golang.org/issue/30907.
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if p.Internal.BuildInfo != "" && p != pmain {
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// Force main packages the test imports to be built as libraries.
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// Normal imports of main packages are forbidden by the package loader,
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// but this can still happen if -coverpkg patterns include main packages:
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// covered packages are imported by pmain. Linking multiple packages
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// compiled with '-p main' causes duplicate symbol errors.
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// See golang.org/issue/30907, golang.org/issue/34114.
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if p.Name == "main" && p != pmain {
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split()
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}
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}
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@ -1,29 +1,32 @@
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# This test checks that multiple main packages can be tested
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# with -coverpkg=all without duplicate symbol errors.
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# Verifies golang.org/issue/30374.
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env GO111MODULE=on
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# Verifies golang.org/issue/30374, golang.org/issue/34114.
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[short] skip
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cd $GOPATH/src/example.com/cov
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env GO111MODULE=on
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go test -coverpkg=all ./...
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-- go.mod --
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env GO111MODULE=off
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go test -coverpkg=all ./...
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-- $GOPATH/src/example.com/cov/go.mod --
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module example.com/cov
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-- mainonly/mainonly.go --
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-- $GOPATH/src/example.com/cov/mainonly/mainonly.go --
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package main
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func main() {}
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-- mainwithtest/mainwithtest.go --
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-- $GOPATH/src/example.com/cov/mainwithtest/mainwithtest.go --
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package main
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func main() {}
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func Foo() {}
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-- mainwithtest/mainwithtest_test.go --
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-- $GOPATH/src/example.com/cov/mainwithtest/mainwithtest_test.go --
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package main
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import "testing"
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@ -32,10 +35,10 @@ func TestFoo(t *testing.T) {
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Foo()
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}
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-- xtest/x.go --
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-- $GOPATH/src/example.com/cov/xtest/x.go --
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package x
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-- xtest/x_test.go --
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-- $GOPATH/src/example.com/cov/xtest/x_test.go --
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package x_test
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import "testing"
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