1 files changed, 116 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/gc/global_test.go b/src/cmd/compile/internal/gc/global_test.go
new file mode 100644
index 0000000..edad6d0
--- /dev/null
+++ b/src/cmd/compile/internal/gc/global_test.go
@@ -0,0 +1,116 @@
+// Copyright 2015 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 gc
+
+import (
+	"bytes"
+	"internal/testenv"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+// Make sure "hello world" does not link in all the
+// fmt.scanf routines. See issue 6853.
+func TestScanfRemoval(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	t.Parallel()
+
+	// Make a directory to work in.
+	dir, err := ioutil.TempDir("", "issue6853a-")
+	if err != nil {
+		t.Fatalf("could not create directory: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	// Create source.
+	src := filepath.Join(dir, "test.go")
+	f, err := os.Create(src)
+	if err != nil {
+		t.Fatalf("could not create source file: %v", err)
+	}
+	f.Write([]byte(`
+package main
+import "fmt"
+func main() {
+	fmt.Println("hello world")
+}
+`))
+	f.Close()
+
+	// Name of destination.
+	dst := filepath.Join(dir, "test")
+
+	// Compile source.
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", dst, src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("could not build target: %v", err)
+	}
+
+	// Check destination to see if scanf code was included.
+	cmd = exec.Command(testenv.GoToolPath(t), "tool", "nm", dst)
+	out, err = cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("could not read target: %v", err)
+	}
+	if bytes.Contains(out, []byte("scanInt")) {
+		t.Fatalf("scanf code not removed from helloworld")
+	}
+}
+
+// Make sure -S prints assembly code. See issue 14515.
+func TestDashS(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	t.Parallel()
+
+	// Make a directory to work in.
+	dir, err := ioutil.TempDir("", "issue14515-")
+	if err != nil {
+		t.Fatalf("could not create directory: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	// Create source.
+	src := filepath.Join(dir, "test.go")
+	f, err := os.Create(src)
+	if err != nil {
+		t.Fatalf("could not create source file: %v", err)
+	}
+	f.Write([]byte(`
+package main
+import "fmt"
+func main() {
+	fmt.Println("hello world")
+}
+`))
+	f.Close()
+
+	// Compile source.
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags", "-S", "-o", filepath.Join(dir, "test"), src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("could not build target: %v", err)
+	}
+
+	patterns := []string{
+		// It is hard to look for actual instructions in an
+		// arch-independent way. So we'll just look for
+		// pseudo-ops that are arch-independent.
+		"\tTEXT\t",
+		"\tFUNCDATA\t",
+		"\tPCDATA\t",
+	}
+	outstr := string(out)
+	for _, p := range patterns {
+		if !strings.Contains(outstr, p) {
+			println(outstr)
+			panic("can't find pattern " + p)
+		}
+	}
+}