--- /dev/null
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !compiler_bootstrap
+
+package base
+
+// CompilerBootstrap reports whether the current compiler binary was
+// built with -tags=compiler_bootstrap.
+const CompilerBootstrap = false
--- /dev/null
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build compiler_bootstrap
+
+package base
+
+// CompilerBootstrap reports whether the current compiler binary was
+// built with -tags=compiler_bootstrap.
+const CompilerBootstrap = true
// freePackage ensures the given package is garbage collected.
func freePackage(pkg *types2.Package) {
+ // The GC test below relies on a precise GC that runs finalizers as
+ // soon as objects are unreachable. Our implementation provides
+ // this, but other/older implementations may not (e.g., Go 1.4 does
+ // not because of #22350). To avoid imposing unnecessary
+ // restrictions on the GOROOT_BOOTSTRAP toolchain, we skip the test
+ // during bootstrapping.
+ if base.CompilerBootstrap {
+ return
+ }
+
// Set a finalizer on pkg so we can detect if/when it's collected.
done := make(chan struct{})
runtime.SetFinalizer(pkg, func(*types2.Package) { close(done) })