cmd/go, cmd/link, runtime: enable PIE build mode, cgo race tests on FreeBSD

Fixes #24546

Change-Id: I99ebd5bc18e5c5e42eee4689644a7a8b02405f31
Reviewed-on: https://go-review.googlesource.com/102616
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/go/go_test.go

@@ -4821,7 +4821,8 @@ func TestBuildmodePIE(t *testing.T) {
 	platform := fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH)
 	switch platform {
 	case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x",
-		"android/amd64", "android/arm", "android/arm64", "android/386":
+		"android/amd64", "android/arm", "android/arm64", "android/386",
+		"freebsd/amd64":
 	case "darwin/amd64":
 	default:
 		t.Skipf("skipping test because buildmode=pie is not supported on %s", platform)
@@ -4836,7 +4837,7 @@ func TestBuildmodePIE(t *testing.T) {
 	tg.run("build", "-buildmode=pie", "-o", obj, src)
 
 	switch runtime.GOOS {
-	case "linux", "android":
+	case "linux", "android", "freebsd":
 		f, err := elf.Open(obj)
 		if err != nil {
 			t.Fatal(err)

src/cmd/go/internal/work/init.go

@@ -139,7 +139,8 @@ func buildModeInit() {
 		} else {
 			switch platform {
 			case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x",
-				"android/amd64", "android/arm", "android/arm64", "android/386":
+				"android/amd64", "android/arm", "android/arm64", "android/386",
+				"freebsd/amd64":
 				codegenArg = "-shared"
 			case "darwin/amd64":
 				codegenArg = "-shared"

src/cmd/link/internal/ld/config.go

@@ -39,7 +39,7 @@ func (mode *BuildMode) Set(s string) error {
 	case "pie":
 		switch objabi.GOOS {
 		case "android", "linux":
-		case "darwin":
+		case "darwin", "freebsd":
 			switch objabi.GOARCH {
 			case "amd64":
 			default:

src/runtime/crash_cgo_test.go

@@ -343,7 +343,7 @@ func TestCgoPprofThreadNoTraceback(t *testing.T) {
 }
 
 func TestRaceProf(t *testing.T) {
-	if runtime.GOOS != "linux" || runtime.GOARCH != "amd64" {
+	if (runtime.GOOS != "linux" && runtime.GOOS != "freebsd") || runtime.GOARCH != "amd64" {
 		t.Skipf("not yet supported on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 
@@ -372,7 +372,7 @@ func TestRaceProf(t *testing.T) {
 
 func TestRaceSignal(t *testing.T) {
 	t.Parallel()
-	if runtime.GOOS != "linux" || runtime.GOARCH != "amd64" {
+	if (runtime.GOOS != "linux" && runtime.GOOS != "freebsd") || runtime.GOARCH != "amd64" {
 		t.Skipf("not yet supported on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 

src/runtime/testdata/testprogcgo/raceprof.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,amd64
+// +build linux,amd64 freebsd,amd64
 
 package main
 

src/runtime/testdata/testprogcgo/racesig.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,amd64
+// +build linux,amd64 freebsd,amd64
 
 package main