1 files changed, 163 insertions, 0 deletions
diff --git a/test/linkobj.go b/test/linkobj.go
new file mode 100644
index 0000000..fcf3f88
--- /dev/null
+++ b/test/linkobj.go
@@ -0,0 +1,163 @@
+// +build !nacl,!js,gc,!wasip1
+// run
+
+// Copyright 2016 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.
+
+// Test the compiler -linkobj flag.
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+var pwd, tmpdir string
+
+func main() {
+	dir, err := ioutil.TempDir("", "go-test-linkobj-")
+	if err != nil {
+		log.Fatal(err)
+	}
+	pwd, err = os.Getwd()
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		os.RemoveAll(dir)
+		log.Fatal(err)
+	}
+	tmpdir = dir
+
+	writeFile("p1.go", `
+		package p1
+
+		func F() {
+			println("hello from p1")
+		}
+	`)
+	writeFile("p2.go", `
+		package p2
+
+		import "./p1"
+
+		func F() {
+			p1.F()
+			println("hello from p2")
+		}
+
+		func main() {}
+	`)
+	writeFile("p3.go", `
+		package main
+
+		import "./p2"
+
+		func main() {
+			p2.F()
+			println("hello from main")
+		}
+	`)
+
+	stdlibimportcfg, err := os.ReadFile(os.Getenv("STDLIB_IMPORTCFG"))
+	if err != nil {
+		fatalf("listing stdlib export files: %v", err)
+	}
+
+	// two rounds: once using normal objects, again using .a files (compile -pack).
+	for round := 0; round < 2; round++ {
+		pkg := "-pack=" + fmt.Sprint(round)
+
+		// The compiler expects the files being read to have the right suffix.
+		o := "o"
+		if round == 1 {
+			o = "a"
+		}
+
+		importcfg := string(stdlibimportcfg) + "\npackagefile p1=p1." + o + "\npackagefile p2=p2." + o
+		os.WriteFile("importcfg", []byte(importcfg), 0644)
+
+		// inlining is disabled to make sure that the link objects contain needed code.
+		run("go", "tool", "compile", "-p=p1", pkg, "-D", ".", "-importcfg=importcfg", "-l", "-o", "p1."+o, "-linkobj", "p1.lo", "p1.go")
+		run("go", "tool", "compile", "-p=p2", pkg, "-D", ".", "-importcfg=importcfg", "-l", "-o", "p2."+o, "-linkobj", "p2.lo", "p2.go")
+		run("go", "tool", "compile", "-p=main", pkg, "-D", ".", "-importcfg=importcfg", "-l", "-o", "p3."+o, "-linkobj", "p3.lo", "p3.go")
+
+		cp("p1."+o, "p1.oo")
+		cp("p2."+o, "p2.oo")
+		cp("p3."+o, "p3.oo")
+		cp("p1.lo", "p1."+o)
+		cp("p2.lo", "p2."+o)
+		cp("p3.lo", "p3."+o)
+		out := runFail("go", "tool", "link", "p2."+o)
+		if !strings.Contains(out, "not package main") {
+			fatalf("link p2.o failed but not for package main:\n%s", out)
+		}
+
+		run("go", "tool", "link", "-importcfg=importcfg", "-o", "a.out.exe", "p3."+o)
+		out = run("./a.out.exe")
+		if !strings.Contains(out, "hello from p1\nhello from p2\nhello from main\n") {
+			fatalf("running main, incorrect output:\n%s", out)
+		}
+
+		// ensure that mistaken future round can't use these
+		os.Remove("p1.o")
+		os.Remove("a.out.exe")
+	}
+
+	cleanup()
+}
+
+func run(args ...string) string {
+	out, err := exec.Command(args[0], args[1:]...).CombinedOutput()
+	if err != nil {
+		fatalf("run %v: %s\n%s", args, err, out)
+	}
+	return string(out)
+}
+
+func runFail(args ...string) string {
+	out, err := exec.Command(args[0], args[1:]...).CombinedOutput()
+	if err == nil {
+		fatalf("runFail %v: unexpected success!\n%s", args, err, out)
+	}
+	return string(out)
+}
+
+func cp(src, dst string) {
+	data, err := ioutil.ReadFile(src)
+	if err != nil {
+		fatalf("%v", err)
+	}
+	err = ioutil.WriteFile(dst, data, 0666)
+	if err != nil {
+		fatalf("%v", err)
+	}
+}
+
+func writeFile(name, data string) {
+	err := ioutil.WriteFile(name, []byte(data), 0666)
+	if err != nil {
+		fatalf("%v", err)
+	}
+}
+
+func cleanup() {
+	const debug = false
+	if debug {
+		println("TMPDIR:", tmpdir)
+		return
+	}
+	os.Chdir(pwd) // get out of tmpdir before removing it
+	os.RemoveAll(tmpdir)
+}
+
+func fatalf(format string, args ...interface{}) {
+	cleanup()
+	log.Fatalf(format, args...)
+}