cmd/compile: un-hide closure func in init function

Same as CL 492135, but for init function.

Fixes #62277

Change-Id: If5ff9bc2ce2a73193b1f7ee5f7f14045d1354f56
Reviewed-on: https://go-review.googlesource.com/c/go/+/522956
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>

src/cmd/cgo/internal/testshared/shared_test.go

@@ -1159,6 +1159,12 @@ func TestIssue47873(t *testing.T) {
 	goCmd(t, "run", "-linkshared", "./issue47837/main")
 }
 
+func TestIssue62277(t *testing.T) {
+	globalSkip(t)
+	goCmd(t, "install", "-buildmode=shared", "-linkshared", "./issue62277/p")
+	goCmd(t, "test", "-linkshared", "./issue62277")
+}
+
 // Test that we can build std in shared mode.
 func TestStd(t *testing.T) {
 	if testing.Short() {

src/cmd/cgo/internal/testshared/testdata/issue62277/issue62277_test.go

@@ -0,0 +1,16 @@
+// Copyright 2023 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.
+
+package issue62277_test
+
+import (
+	"testing"
+
+	"testshared/issue62277/p"
+)
+
+func TestIssue62277(t *testing.T) {
+	t.Log(p.S)
+	t.Log(p.T)
+}

src/cmd/cgo/internal/testshared/testdata/issue62277/p/p.go

@@ -0,0 +1,17 @@
+// Copyright 2023 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.
+
+package p
+
+var S = func() []string {
+	return []string{"LD_LIBRARY_PATH"}
+}()
+
+var T []string
+
+func init() {
+	T = func() []string {
+		return []string{"LD_LIBRARY_PATH"}
+	}()
+}

src/cmd/compile/internal/noder/reader.go

@@ -3109,6 +3109,11 @@ func (r *reader) funcLit() ir.Node {
 
 	r.addBody(fn, nil)
 
+	// un-hide closures belong to init function.
+	if (r.curfn.IsPackageInit() || strings.HasPrefix(r.curfn.Sym().Name, "init.")) && ir.IsTrivialClosure(fn.OClosure) {
+		fn.SetIsHiddenClosure(false)
+	}
+
 	return fn.OClosure
 }