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// Copyright 2019 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.
//go:build cgo
// +build cgo
package so_test
import (
"log"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"testing"
)
func requireTestSOSupported(t *testing.T) {
t.Helper()
switch runtime.GOARCH {
case "arm64":
if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
t.Skip("No exec facility on iOS.")
}
case "ppc64":
if runtime.GOOS == "linux" {
t.Skip("External linking not implemented on linux/ppc64 (issue #8912).")
}
}
if runtime.GOOS == "android" {
t.Skip("No exec facility on Android.")
}
}
func TestSO(t *testing.T) {
requireTestSOSupported(t)
GOPATH, err := os.MkdirTemp("", "cgosotest")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(GOPATH)
modRoot := filepath.Join(GOPATH, "src", "cgosotest")
if err := overlayDir(modRoot, "testdata"); err != nil {
log.Panic(err)
}
if err := os.WriteFile(filepath.Join(modRoot, "go.mod"), []byte("module cgosotest\n"), 0666); err != nil {
log.Panic(err)
}
cmd := exec.Command("go", "env", "CC", "GOGCCFLAGS")
cmd.Dir = modRoot
cmd.Stderr = new(strings.Builder)
cmd.Env = append(os.Environ(), "GOPATH="+GOPATH)
out, err := cmd.Output()
if err != nil {
t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
}
lines := strings.Split(string(out), "\n")
if len(lines) != 3 || lines[2] != "" {
t.Fatalf("Unexpected output from %s:\n%s", strings.Join(cmd.Args, " "), lines)
}
cc := lines[0]
if cc == "" {
t.Fatal("CC environment variable (go env CC) cannot be empty")
}
gogccflags := strings.Split(lines[1], " ")
// build shared object
ext := "so"
args := append(gogccflags, "-shared")
switch runtime.GOOS {
case "darwin", "ios":
ext = "dylib"
args = append(args, "-undefined", "suppress", "-flat_namespace")
case "windows":
ext = "dll"
args = append(args, "-DEXPORT_DLL")
// At least in mingw-clang it is not permitted to just name a .dll
// on the command line. You must name the corresponding import
// library instead, even though the dll is used when the executable is run.
args = append(args, "-Wl,-out-implib,libcgosotest.a")
case "aix":
ext = "so.1"
}
sofname := "libcgosotest." + ext
args = append(args, "-o", sofname, "cgoso_c.c")
cmd = exec.Command(cc, args...)
cmd.Dir = modRoot
cmd.Env = append(os.Environ(), "GOPATH="+GOPATH)
out, err = cmd.CombinedOutput()
if err != nil {
t.Fatalf("%s: %s\n%s", strings.Join(cmd.Args, " "), err, out)
}
t.Logf("%s:\n%s", strings.Join(cmd.Args, " "), out)
if runtime.GOOS == "aix" {
// Shared object must be wrapped by an archive
cmd = exec.Command("ar", "-X64", "-q", "libcgosotest.a", "libcgosotest.so.1")
cmd.Dir = modRoot
out, err = cmd.CombinedOutput()
if err != nil {
t.Fatalf("%s: %s\n%s", strings.Join(cmd.Args, " "), err, out)
}
}
cmd = exec.Command("go", "build", "-o", "main.exe", "main.go")
cmd.Dir = modRoot
cmd.Env = append(os.Environ(), "GOPATH="+GOPATH)
out, err = cmd.CombinedOutput()
if err != nil {
t.Fatalf("%s: %s\n%s", strings.Join(cmd.Args, " "), err, out)
}
t.Logf("%s:\n%s", strings.Join(cmd.Args, " "), out)
cmd = exec.Command("./main.exe")
cmd.Dir = modRoot
cmd.Env = append(os.Environ(), "GOPATH="+GOPATH)
if runtime.GOOS != "windows" {
s := "LD_LIBRARY_PATH"
if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
s = "DYLD_LIBRARY_PATH"
}
cmd.Env = append(os.Environ(), s+"=.")
// On FreeBSD 64-bit architectures, the 32-bit linker looks for
// different environment variables.
if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" {
cmd.Env = append(cmd.Env, "LD_32_LIBRARY_PATH=.")
}
}
out, err = cmd.CombinedOutput()
if err != nil {
t.Fatalf("%s: %s\n%s", strings.Join(cmd.Args, " "), err, out)
}
t.Logf("%s:\n%s", strings.Join(cmd.Args, " "), out)
}
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