blob: c9e9e5fe63e4a53222b442c3db6f846a853d3b0d [file] [log] [blame]
// Copyright 2017 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 cshared_test
import (
"bytes"
"debug/elf"
"debug/pe"
"encoding/binary"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"sync"
"testing"
"unicode"
)
// C compiler with args (from $(go env CC) $(go env GOGCCFLAGS)).
var cc []string
// ".exe" on Windows.
var exeSuffix string
var GOOS, GOARCH, GOROOT string
var installdir, androiddir string
var libSuffix, libgoname string
func TestMain(m *testing.M) {
os.Exit(testMain(m))
}
func testMain(m *testing.M) int {
log.SetFlags(log.Lshortfile)
flag.Parse()
if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
os.Exit(0)
}
GOOS = goEnv("GOOS")
GOARCH = goEnv("GOARCH")
GOROOT = goEnv("GOROOT")
if _, err := os.Stat(GOROOT); os.IsNotExist(err) {
log.Fatalf("Unable able to find GOROOT at '%s'", GOROOT)
}
androiddir = fmt.Sprintf("/data/local/tmp/testcshared-%d", os.Getpid())
if runtime.GOOS != GOOS && GOOS == "android" {
args := append(adbCmd(), "exec-out", "mkdir", "-p", androiddir)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("setupAndroid failed: %v\n%s\n", err, out)
}
defer cleanupAndroid()
}
cc = []string{goEnv("CC")}
out := goEnv("GOGCCFLAGS")
quote := '\000'
start := 0
lastSpace := true
backslash := false
s := string(out)
for i, c := range s {
if quote == '\000' && unicode.IsSpace(c) {
if !lastSpace {
cc = append(cc, s[start:i])
lastSpace = true
}
} else {
if lastSpace {
start = i
lastSpace = false
}
if quote == '\000' && !backslash && (c == '"' || c == '\'') {
quote = c
backslash = false
} else if !backslash && quote == c {
quote = '\000'
} else if (quote == '\000' || quote == '"') && !backslash && c == '\\' {
backslash = true
} else {
backslash = false
}
}
}
if !lastSpace {
cc = append(cc, s[start:])
}
switch GOOS {
case "darwin", "ios":
// For Darwin/ARM.
// TODO(crawshaw): can we do better?
cc = append(cc, []string{"-framework", "CoreFoundation", "-framework", "Foundation"}...)
case "android":
cc = append(cc, "-pie")
}
libgodir := GOOS + "_" + GOARCH
switch GOOS {
case "darwin", "ios":
if GOARCH == "arm64" {
libgodir += "_shared"
}
case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris", "illumos":
libgodir += "_shared"
}
cc = append(cc, "-I", filepath.Join("pkg", libgodir))
// Force reallocation (and avoid aliasing bugs) for parallel tests that append to cc.
cc = cc[:len(cc):len(cc)]
if GOOS == "windows" {
exeSuffix = ".exe"
}
// Copy testdata into GOPATH/src/testcshared, along with a go.mod file
// declaring the same path.
GOPATH, err := os.MkdirTemp("", "cshared_test")
if err != nil {
log.Panic(err)
}
defer os.RemoveAll(GOPATH)
os.Setenv("GOPATH", GOPATH)
modRoot := filepath.Join(GOPATH, "src", "testcshared")
if err := overlayDir(modRoot, "testdata"); err != nil {
log.Panic(err)
}
if err := os.Chdir(modRoot); err != nil {
log.Panic(err)
}
os.Setenv("PWD", modRoot)
if err := os.WriteFile("go.mod", []byte("module testcshared\n"), 0666); err != nil {
log.Panic(err)
}
// Directory where cgo headers and outputs will be installed.
// The installation directory format varies depending on the platform.
output, err := exec.Command("go", "list",
"-buildmode=c-shared",
"-installsuffix", "testcshared",
"-f", "{{.Target}}",
"./libgo").CombinedOutput()
if err != nil {
log.Panicf("go list failed: %v\n%s", err, output)
}
target := string(bytes.TrimSpace(output))
libgoname = filepath.Base(target)
installdir = filepath.Dir(target)
libSuffix = strings.TrimPrefix(filepath.Ext(target), ".")
return m.Run()
}
func goEnv(key string) string {
out, err := exec.Command("go", "env", key).Output()
if err != nil {
log.Printf("go env %s failed:\n%s", key, err)
log.Panicf("%s", err.(*exec.ExitError).Stderr)
}
return strings.TrimSpace(string(out))
}
func cmdToRun(name string) string {
return "./" + name + exeSuffix
}
func adbCmd() []string {
cmd := []string{"adb"}
if flags := os.Getenv("GOANDROID_ADB_FLAGS"); flags != "" {
cmd = append(cmd, strings.Split(flags, " ")...)
}
return cmd
}
func adbPush(t *testing.T, filename string) {
if runtime.GOOS == GOOS || GOOS != "android" {
return
}
args := append(adbCmd(), "push", filename, fmt.Sprintf("%s/%s", androiddir, filename))
cmd := exec.Command(args[0], args[1:]...)
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("adb command failed: %v\n%s\n", err, out)
}
}
func adbRun(t *testing.T, env []string, adbargs ...string) string {
if GOOS != "android" {
t.Fatalf("trying to run adb command when operating system is not android.")
}
args := append(adbCmd(), "exec-out")
// Propagate LD_LIBRARY_PATH to the adb shell invocation.
for _, e := range env {
if strings.Contains(e, "LD_LIBRARY_PATH=") {
adbargs = append([]string{e}, adbargs...)
break
}
}
shellcmd := fmt.Sprintf("cd %s; %s", androiddir, strings.Join(adbargs, " "))
args = append(args, shellcmd)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("adb command failed: %v\n%s\n", err, out)
}
return strings.Replace(string(out), "\r", "", -1)
}
func run(t *testing.T, extraEnv []string, args ...string) string {
t.Helper()
cmd := exec.Command(args[0], args[1:]...)
if len(extraEnv) > 0 {
cmd.Env = append(os.Environ(), extraEnv...)
}
if GOOS != "windows" {
// TestUnexportedSymbols relies on file descriptor 30
// being closed when the program starts, so enforce
// that in all cases. (The first three descriptors are
// stdin/stdout/stderr, so we just need to make sure
// that cmd.ExtraFiles[27] exists and is nil.)
cmd.ExtraFiles = make([]*os.File, 28)
}
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("command failed: %v\n%v\n%s\n", args, err, out)
} else {
t.Logf("run: %v", args)
}
return string(out)
}
func runExe(t *testing.T, extraEnv []string, args ...string) string {
t.Helper()
if runtime.GOOS != GOOS && GOOS == "android" {
return adbRun(t, append(os.Environ(), extraEnv...), args...)
}
return run(t, extraEnv, args...)
}
func runCC(t *testing.T, args ...string) string {
t.Helper()
// This function is run in parallel, so append to a copy of cc
// rather than cc itself.
return run(t, nil, append(append([]string(nil), cc...), args...)...)
}
func createHeaders() error {
// The 'cgo' command generates a number of additional artifacts,
// but we're only interested in the header.
// Shunt the rest of the outputs to a temporary directory.
objDir, err := os.MkdirTemp("", "testcshared_obj")
if err != nil {
return err
}
defer os.RemoveAll(objDir)
// Generate a C header file for p, which is a non-main dependency
// of main package libgo.
//
// TODO(golang.org/issue/35715): This should be simpler.
args := []string{"go", "tool", "cgo",
"-objdir", objDir,
"-exportheader", "p.h",
filepath.Join(".", "p", "p.go")}
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("command failed: %v\n%v\n%s\n", args, err, out)
}
// Generate a C header file for libgo itself.
args = []string{"go", "install", "-buildmode=c-shared",
"-installsuffix", "testcshared", "./libgo"}
cmd = exec.Command(args[0], args[1:]...)
out, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("command failed: %v\n%v\n%s\n", args, err, out)
}
args = []string{"go", "build", "-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libgoname,
filepath.Join(".", "libgo", "libgo.go")}
if GOOS == "windows" && strings.HasSuffix(args[6], ".a") {
args[6] = strings.TrimSuffix(args[6], ".a") + ".dll"
}
cmd = exec.Command(args[0], args[1:]...)
out, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("command failed: %v\n%v\n%s\n", args, err, out)
}
if GOOS == "windows" {
// We can't simply pass -Wl,--out-implib, because this relies on having imports from multiple packages,
// which results in the linkers output implib getting overwritten at each step. So instead build the
// import library the traditional way, using a def file.
err = os.WriteFile("libgo.def",
[]byte("LIBRARY libgo.dll\nEXPORTS\n\tDidInitRun\n\tDidMainRun\n\tDivu\n\tFromPkg\n\t_cgo_dummy_export\n"),
0644)
if err != nil {
return fmt.Errorf("unable to write def file: %v", err)
}
out, err = exec.Command(cc[0], append(cc[1:], "-print-prog-name=dlltool")...).CombinedOutput()
if err != nil {
return fmt.Errorf("unable to find dlltool path: %v\n%s\n", err, out)
}
args := []string{strings.TrimSpace(string(out)), "-D", args[6], "-l", libgoname, "-d", "libgo.def"}
// This is an unfortunate workaround for https://github.com/mstorsjo/llvm-mingw/issues/205 in which
// we basically reimplement the contents of the dlltool.sh wrapper: https://git.io/JZFlU
dlltoolContents, err := os.ReadFile(args[0])
if err != nil {
return fmt.Errorf("unable to read dlltool: %v\n", err)
}
if bytes.HasPrefix(dlltoolContents, []byte("#!/bin/sh")) && bytes.Contains(dlltoolContents, []byte("llvm-dlltool")) {
base, name := filepath.Split(args[0])
args[0] = filepath.Join(base, "llvm-dlltool")
var machine string
switch prefix, _, _ := strings.Cut(name, "-"); prefix {
case "i686":
machine = "i386"
case "x86_64":
machine = "i386:x86-64"
case "armv7":
machine = "arm"
case "aarch64":
machine = "arm64"
}
if len(machine) > 0 {
args = append(args, "-m", machine)
}
}
out, err = exec.Command(args[0], args[1:]...).CombinedOutput()
if err != nil {
return fmt.Errorf("unable to run dlltool to create import library: %v\n%s\n", err, out)
}
}
if runtime.GOOS != GOOS && GOOS == "android" {
args = append(adbCmd(), "push", libgoname, fmt.Sprintf("%s/%s", androiddir, libgoname))
cmd = exec.Command(args[0], args[1:]...)
out, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("adb command failed: %v\n%s\n", err, out)
}
}
return nil
}
var (
headersOnce sync.Once
headersErr error
)
func createHeadersOnce(t *testing.T) {
headersOnce.Do(func() {
headersErr = createHeaders()
})
if headersErr != nil {
t.Fatal(headersErr)
}
}
func cleanupAndroid() {
if GOOS != "android" {
return
}
args := append(adbCmd(), "exec-out", "rm", "-rf", androiddir)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
log.Panicf("cleanupAndroid failed: %v\n%s\n", err, out)
}
}
// test0: exported symbols in shared lib are accessible.
func TestExportedSymbols(t *testing.T) {
t.Parallel()
cmd := "testp0"
bin := cmdToRun(cmd)
createHeadersOnce(t)
runCC(t, "-I", installdir, "-o", cmd, "main0.c", libgoname)
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, []string{"LD_LIBRARY_PATH=."}, bin)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
func checkNumberOfExportedFunctionsWindows(t *testing.T, exportAllSymbols bool) {
const prog = `
package main
import "C"
//export GoFunc
func GoFunc() {
println(42)
}
//export GoFunc2
func GoFunc2() {
println(24)
}
func main() {
}
`
tmpdir := t.TempDir()
srcfile := filepath.Join(tmpdir, "test.go")
objfile := filepath.Join(tmpdir, "test.dll")
if err := os.WriteFile(srcfile, []byte(prog), 0666); err != nil {
t.Fatal(err)
}
argv := []string{"build", "-buildmode=c-shared"}
if exportAllSymbols {
argv = append(argv, "-ldflags", "-extldflags=-Wl,--export-all-symbols")
}
argv = append(argv, "-o", objfile, srcfile)
out, err := exec.Command("go", argv...).CombinedOutput()
if err != nil {
t.Fatalf("build failure: %s\n%s\n", err, string(out))
}
f, err := pe.Open(objfile)
if err != nil {
t.Fatalf("pe.Open failed: %v", err)
}
defer f.Close()
section := f.Section(".edata")
if section == nil {
t.Skip(".edata section is not present")
}
// TODO: deduplicate this struct from cmd/link/internal/ld/pe.go
type IMAGE_EXPORT_DIRECTORY struct {
_ [2]uint32
_ [2]uint16
_ [2]uint32
NumberOfFunctions uint32
NumberOfNames uint32
_ [3]uint32
}
var e IMAGE_EXPORT_DIRECTORY
if err := binary.Read(section.Open(), binary.LittleEndian, &e); err != nil {
t.Fatalf("binary.Read failed: %v", err)
}
// Only the two exported functions and _cgo_dummy_export should be exported
expectedNumber := uint32(3)
if exportAllSymbols {
if e.NumberOfFunctions <= expectedNumber {
t.Fatalf("missing exported functions: %v", e.NumberOfFunctions)
}
if e.NumberOfNames <= expectedNumber {
t.Fatalf("missing exported names: %v", e.NumberOfNames)
}
} else {
if e.NumberOfFunctions != expectedNumber {
t.Fatalf("got %d exported functions; want %d", e.NumberOfFunctions, expectedNumber)
}
if e.NumberOfNames != expectedNumber {
t.Fatalf("got %d exported names; want %d", e.NumberOfNames, expectedNumber)
}
}
}
func TestNumberOfExportedFunctions(t *testing.T) {
if GOOS != "windows" {
t.Skip("skipping windows only test")
}
t.Parallel()
t.Run("OnlyExported", func(t *testing.T) {
checkNumberOfExportedFunctionsWindows(t, false)
})
t.Run("All", func(t *testing.T) {
checkNumberOfExportedFunctionsWindows(t, true)
})
}
// test1: shared library can be dynamically loaded and exported symbols are accessible.
func TestExportedSymbolsWithDynamicLoad(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp1"
bin := cmdToRun(cmd)
createHeadersOnce(t)
if GOOS != "freebsd" {
runCC(t, "-o", cmd, "main1.c", "-ldl")
} else {
runCC(t, "-o", cmd, "main1.c")
}
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, nil, bin, "./"+libgoname)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
// test2: tests libgo2 which does not export any functions.
func TestUnexportedSymbols(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp2"
bin := cmdToRun(cmd)
libname := "libgo2." + libSuffix
run(t,
nil,
"go", "build",
"-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libname, "./libgo2",
)
adbPush(t, libname)
linkFlags := "-Wl,--no-as-needed"
if GOOS == "darwin" || GOOS == "ios" {
linkFlags = ""
}
runCC(t, "-o", cmd, "main2.c", linkFlags, libname)
adbPush(t, cmd)
defer os.Remove(libname)
defer os.Remove(bin)
out := runExe(t, []string{"LD_LIBRARY_PATH=."}, bin)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
// test3: tests main.main is exported on android.
func TestMainExportedOnAndroid(t *testing.T) {
t.Parallel()
switch GOOS {
case "android":
break
default:
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp3"
bin := cmdToRun(cmd)
createHeadersOnce(t)
runCC(t, "-o", cmd, "main3.c", "-ldl")
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, nil, bin, "./"+libgoname)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
func testSignalHandlers(t *testing.T, pkgname, cfile, cmd string) {
libname := pkgname + "." + libSuffix
run(t,
nil,
"go", "build",
"-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libname, pkgname,
)
adbPush(t, libname)
if GOOS != "freebsd" {
runCC(t, "-pthread", "-o", cmd, cfile, "-ldl")
} else {
runCC(t, "-pthread", "-o", cmd, cfile)
}
adbPush(t, cmd)
bin := cmdToRun(cmd)
defer os.Remove(libname)
defer os.Remove(bin)
defer os.Remove(pkgname + ".h")
out := runExe(t, nil, bin, "./"+libname)
if strings.TrimSpace(out) != "PASS" {
t.Error(run(t, nil, bin, libname, "verbose"))
}
}
// test4: test signal handlers
func TestSignalHandlers(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
testSignalHandlers(t, "./libgo4", "main4.c", "testp4")
}
// test5: test signal handlers with os/signal.Notify
func TestSignalHandlersWithNotify(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
testSignalHandlers(t, "./libgo5", "main5.c", "testp5")
}
func TestPIE(t *testing.T) {
t.Parallel()
switch GOOS {
case "linux", "android":
break
default:
t.Logf("Skipping on %s", GOOS)
return
}
createHeadersOnce(t)
f, err := elf.Open(libgoname)
if err != nil {
t.Fatalf("elf.Open failed: %v", err)
}
defer f.Close()
ds := f.SectionByType(elf.SHT_DYNAMIC)
if ds == nil {
t.Fatalf("no SHT_DYNAMIC section")
}
d, err := ds.Data()
if err != nil {
t.Fatalf("can't read SHT_DYNAMIC contents: %v", err)
}
for len(d) > 0 {
var tag elf.DynTag
switch f.Class {
case elf.ELFCLASS32:
tag = elf.DynTag(f.ByteOrder.Uint32(d[:4]))
d = d[8:]
case elf.ELFCLASS64:
tag = elf.DynTag(f.ByteOrder.Uint64(d[:8]))
d = d[16:]
}
if tag == elf.DT_TEXTREL {
t.Fatalf("%s has DT_TEXTREL flag", libgoname)
}
}
}
// Test that installing a second time recreates the header file.
func TestCachedInstall(t *testing.T) {
tmpdir, err := os.MkdirTemp("", "cshared")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
copyFile(t, filepath.Join(tmpdir, "src", "testcshared", "go.mod"), "go.mod")
copyFile(t, filepath.Join(tmpdir, "src", "testcshared", "libgo", "libgo.go"), filepath.Join("libgo", "libgo.go"))
copyFile(t, filepath.Join(tmpdir, "src", "testcshared", "p", "p.go"), filepath.Join("p", "p.go"))
env := append(os.Environ(), "GOPATH="+tmpdir, "GOBIN="+filepath.Join(tmpdir, "bin"))
buildcmd := []string{"go", "install", "-x", "-buildmode=c-shared", "-installsuffix", "testcshared", "./libgo"}
cmd := exec.Command(buildcmd[0], buildcmd[1:]...)
cmd.Dir = filepath.Join(tmpdir, "src", "testcshared")
cmd.Env = env
t.Log(buildcmd)
out, err := cmd.CombinedOutput()
t.Logf("%s", out)
if err != nil {
t.Fatal(err)
}
var libgoh, ph string
walker := func(path string, info os.FileInfo, err error) error {
if err != nil {
t.Fatal(err)
}
var ps *string
switch filepath.Base(path) {
case "libgo.h":
ps = &libgoh
case "p.h":
ps = &ph
}
if ps != nil {
if *ps != "" {
t.Fatalf("%s found again", *ps)
}
*ps = path
}
return nil
}
if err := filepath.Walk(tmpdir, walker); err != nil {
t.Fatal(err)
}
if libgoh == "" {
t.Fatal("libgo.h not installed")
}
if err := os.Remove(libgoh); err != nil {
t.Fatal(err)
}
cmd = exec.Command(buildcmd[0], buildcmd[1:]...)
cmd.Dir = filepath.Join(tmpdir, "src", "testcshared")
cmd.Env = env
t.Log(buildcmd)
out, err = cmd.CombinedOutput()
t.Logf("%s", out)
if err != nil {
t.Fatal(err)
}
if _, err := os.Stat(libgoh); err != nil {
t.Errorf("libgo.h not installed in second run: %v", err)
}
}
// copyFile copies src to dst.
func copyFile(t *testing.T, dst, src string) {
t.Helper()
data, err := os.ReadFile(src)
if err != nil {
t.Fatal(err)
}
if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
t.Fatal(err)
}
if err := os.WriteFile(dst, data, 0666); err != nil {
t.Fatal(err)
}
}
func TestGo2C2Go(t *testing.T) {
switch GOOS {
case "darwin", "ios", "windows":
// Non-ELF shared libraries don't support the multiple
// copies of the runtime package implied by this test.
t.Skipf("linking c-shared into Go programs not supported on %s; issue 29061, 49457", GOOS)
case "android":
t.Skip("test fails on android; issue 29087")
}
t.Parallel()
tmpdir, err := os.MkdirTemp("", "cshared-TestGo2C2Go")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
lib := filepath.Join(tmpdir, "libtestgo2c2go."+libSuffix)
var env []string
if GOOS == "windows" && strings.HasSuffix(lib, ".a") {
env = append(env, "CGO_LDFLAGS=-Wl,--out-implib,"+lib, "CGO_LDFLAGS_ALLOW=.*")
lib = strings.TrimSuffix(lib, ".a") + ".dll"
}
run(t, env, "go", "build", "-buildmode=c-shared", "-o", lib, "./go2c2go/go")
cgoCflags := os.Getenv("CGO_CFLAGS")
if cgoCflags != "" {
cgoCflags += " "
}
cgoCflags += "-I" + tmpdir
cgoLdflags := os.Getenv("CGO_LDFLAGS")
if cgoLdflags != "" {
cgoLdflags += " "
}
cgoLdflags += "-L" + tmpdir + " -ltestgo2c2go"
goenv := []string{"CGO_CFLAGS=" + cgoCflags, "CGO_LDFLAGS=" + cgoLdflags}
ldLibPath := os.Getenv("LD_LIBRARY_PATH")
if ldLibPath != "" {
ldLibPath += ":"
}
ldLibPath += tmpdir
runenv := []string{"LD_LIBRARY_PATH=" + ldLibPath}
bin := filepath.Join(tmpdir, "m1") + exeSuffix
run(t, goenv, "go", "build", "-o", bin, "./go2c2go/m1")
runExe(t, runenv, bin)
bin = filepath.Join(tmpdir, "m2") + exeSuffix
run(t, goenv, "go", "build", "-o", bin, "./go2c2go/m2")
runExe(t, runenv, bin)
}