go/patch/go-1.10.3/go2.patch

diff --git test/run.go test/run.go
index 22ec7576f8..ac5d3c3e8d 100644
--- test/run.go
+++ test/run.go
@@ -39,9 +39,9 @@ var (
 	summary        = flag.Bool("summary", false, "show summary of results")
 	showSkips      = flag.Bool("show_skips", false, "show skipped tests")
 	runSkips       = flag.Bool("run_skips", false, "run skipped tests (ignore skip and build tags)")
-	linkshared     = flag.Bool("linkshared", false, "")
 	updateErrors   = flag.Bool("update_errors", false, "update error messages in test file based on compiler output")
 	runoutputLimit = flag.Int("l", defaultRunOutputLimit(), "number of parallel runoutput tests to run")
+        target         = flag.String("target", "", "if non empty, use 'go_target' to compile test files and 'go_target_exec' to run the binaries")
 
 	shard  = flag.Int("shard", 0, "shard index to run. Only applicable if -shards is non-zero.")
 	shards = flag.Int("shards", 0, "number of shards. If 0, all tests are run. This is used by the continuous build.")
@@ -194,21 +194,15 @@ func goFiles(dir string) []string {
 type runCmd func(...string) ([]byte, error)
 
 func compileFile(runcmd runCmd, longname string, flags []string) (out []byte, err error) {
-	cmd := []string{"go", "tool", "compile", "-e"}
+	cmd := []string{findGoCmd(), "tool", "compile", "-e"}
 	cmd = append(cmd, flags...)
-	if *linkshared {
-		cmd = append(cmd, "-dynlink", "-installsuffix=dynlink")
-	}
 	cmd = append(cmd, longname)
 	return runcmd(cmd...)
 }
 
 func compileInDir(runcmd runCmd, dir string, flags []string, names ...string) (out []byte, err error) {
-	cmd := []string{"go", "tool", "compile", "-e", "-D", ".", "-I", "."}
+	cmd := []string{findGoCmd(), "tool", "compile", "-e", "-D", ".", "-I", "."}
 	cmd = append(cmd, flags...)
-	if *linkshared {
-		cmd = append(cmd, "-dynlink", "-installsuffix=dynlink")
-	}
 	for _, name := range names {
 		cmd = append(cmd, filepath.Join(dir, name))
 	}
@@ -217,15 +211,24 @@ func compileInDir(runcmd runCmd, dir string, flags []string, names ...string) (o
 
 func linkFile(runcmd runCmd, goname string) (err error) {
 	pfile := strings.Replace(goname, ".go", ".o", -1)
-	cmd := []string{"go", "tool", "link", "-w", "-o", "a.exe", "-L", "."}
-	if *linkshared {
-		cmd = append(cmd, "-linkshared", "-installsuffix=dynlink")
-	}
-	cmd = append(cmd, pfile)
-	_, err = runcmd(cmd...)
+	cmd := []string{findGoCmd, "tool", "link", "-w", "-o", "a.exe", "-L", "."}
+	_, err = runcmd(findGoCmd(), "tool", "link", "-w", "-o", "a.exe", "-L", ".", pfile)
 	return
 }
 
+
+func goRun(runcmd runCmd, flags []string, goname string, args ...string) (out []byte, err error) {
+        cmd := []string{findGoCmd(), "run", goGcflags()}
+        if len(findExecCmd()) > 0 {
+                cmd = append(cmd, "-exec")
+                cmd = append(cmd, findExecCmd()...)
+        }
+        cmd = append(cmd, flags...)
+        cmd = append(cmd, goname)
+        cmd = append(cmd, args...)
+        return runcmd(cmd...)
+}
+
 // skipError describes why a test was skipped.
 type skipError string
 
@@ -595,7 +598,7 @@ func (t *test) run() {
 
 	case "errorcheck":
 		// TODO(gri) remove need for -C (disable printing of columns in error messages)
-		cmdline := []string{"go", "tool", "compile", "-C", "-e", "-o", "a.o"}
+		cmdline := []string{findGoCmd(), "tool", "compile", "-C", "-e", "-o", "a.o"}
 		// No need to add -dynlink even if linkshared if we're just checking for errors...
 		cmdline = append(cmdline, flags...)
 		cmdline = append(cmdline, long)
@@ -709,7 +712,7 @@ func (t *test) run() {
 		}
 
 	case "build":
-		_, err := runcmd("go", "build", goGcflags(), "-o", "a.exe", long)
+		_, err := runcmd(findGoCmd(), "build", goGcflags(), "-o", "a.exe", long)
 		if err != nil {
 			t.err = err
 		}
@@ -735,7 +738,7 @@ func (t *test) run() {
 
 		}
 		var objs []string
-		cmd := []string{"go", "tool", "compile", "-e", "-D", ".", "-I", ".", "-o", "go.o"}
+		cmd := []string{findGoCmd(), "tool", "compile", "-e", "-D", ".", "-I", ".", "-o", "go.o"}
 		if len(asms) > 0 {
 			cmd = append(cmd, "-asmhdr", "go_asm.h")
 		}
@@ -749,7 +752,7 @@ func (t *test) run() {
 		}
 		objs = append(objs, "go.o")
 		if len(asms) > 0 {
-			cmd = []string{"go", "tool", "asm", "-e", "-I", ".", "-o", "asm.o"}
+			cmd = []string{findGoCmd(), "tool", "asm", "-e", "-I", ".", "-o", "asm.o"}
 			for _, file := range asms {
 				cmd = append(cmd, filepath.Join(longdir, file.Name()))
 			}
@@ -760,14 +763,14 @@ func (t *test) run() {
 			}
 			objs = append(objs, "asm.o")
 		}
-		cmd = []string{"go", "tool", "pack", "c", "all.a"}
+		cmd = []string{findGoCmd(), "tool", "pack", "c", "all.a"}
 		cmd = append(cmd, objs...)
 		_, err = runcmd(cmd...)
 		if err != nil {
 			t.err = err
 			break
 		}
-		cmd = []string{"go", "tool", "link", "all.a"}
+		cmd = []string{findGoCmd(), "tool", "link", "-o", "a.exe", "all.a"}
 		_, err = runcmd(cmd...)
 		if err != nil {
 			t.err = err
@@ -777,10 +780,7 @@ func (t *test) run() {
 	case "buildrun": // build binary, then run binary, instead of go run. Useful for timeout tests where failure mode is infinite loop.
 		// TODO: not supported on NaCl
 		useTmp = true
-		cmd := []string{"go", "build", goGcflags(), "-o", "a.exe"}
-		if *linkshared {
-			cmd = append(cmd, "-linkshared")
-		}
+		cmd := []string{findGoCmd(), "build", goGcflags(), "-o", "a.exe"}
 		longdirgofile := filepath.Join(filepath.Join(cwd, t.dir), t.gofile)
 		cmd = append(cmd, flags...)
 		cmd = append(cmd, longdirgofile)
@@ -789,7 +789,12 @@ func (t *test) run() {
 			t.err = err
 			return
 		}
-		cmd = []string{"./a.exe"}
+                cmd = []string{}
+                if len(findExecCmd()) > 0 {
+                        cmd = append(cmd, findExecCmd()...)
+                }
+                cmd = append(cmd, "./a.exe")
+
 		out, err = runcmd(append(cmd, args...)...)
 		if err != nil {
 			t.err = err
@@ -802,38 +807,7 @@ func (t *test) run() {
 
 	case "run":
 		useTmp = false
-		var out []byte
-		var err error
-		if len(flags)+len(args) == 0 && goGcflags() == "" && !*linkshared {
-			// If we're not using special go command flags,
-			// skip all the go command machinery.
-			// This avoids any time the go command would
-			// spend checking whether, for example, the installed
-			// package runtime is up to date.
-			// Because we run lots of trivial test programs,
-			// the time adds up.
-			pkg := filepath.Join(t.tempDir, "pkg.a")
-			if _, err := runcmd("go", "tool", "compile", "-o", pkg, t.goFileName()); err != nil {
-				t.err = err
-				return
-			}
-			exe := filepath.Join(t.tempDir, "test.exe")
-			cmd := []string{"go", "tool", "link", "-s", "-w"}
-			cmd = append(cmd, "-o", exe, pkg)
-			if _, err := runcmd(cmd...); err != nil {
-				t.err = err
-				return
-			}
-			out, err = runcmd(append([]string{exe}, args...)...)
-		} else {
-			cmd := []string{"go", "run", goGcflags()}
-			if *linkshared {
-				cmd = append(cmd, "-linkshared")
-			}
-			cmd = append(cmd, flags...)
-			cmd = append(cmd, t.goFileName())
-			out, err = runcmd(append(cmd, args...)...)
-		}
+		out, err := goRun(runcmd, flags, t.goFileName(), args...)
 		if err != nil {
 			t.err = err
 			return
@@ -848,12 +822,7 @@ func (t *test) run() {
 			<-rungatec
 		}()
 		useTmp = false
-		cmd := []string{"go", "run", goGcflags()}
-		if *linkshared {
-			cmd = append(cmd, "-linkshared")
-		}
-		cmd = append(cmd, t.goFileName())
-		out, err := runcmd(append(cmd, args...)...)
+		out, err := goRun(runcmd, nil, t.goFileName(), args...)
 		if err != nil {
 			t.err = err
 			return
@@ -863,12 +832,7 @@ func (t *test) run() {
 			t.err = fmt.Errorf("write tempfile:%s", err)
 			return
 		}
-		cmd = []string{"go", "run", goGcflags()}
-		if *linkshared {
-			cmd = append(cmd, "-linkshared")
-		}
-		cmd = append(cmd, tfile)
-		out, err = runcmd(cmd...)
+		out, err = goRun(runcmd, nil, tfile)
 		if err != nil {
 			t.err = err
 			return
@@ -879,12 +843,7 @@ func (t *test) run() {
 
 	case "errorcheckoutput":
 		useTmp = false
-		cmd := []string{"go", "run", goGcflags()}
-		if *linkshared {
-			cmd = append(cmd, "-linkshared")
-		}
-		cmd = append(cmd, t.goFileName())
-		out, err := runcmd(append(cmd, args...)...)
+		out, err := goRun(runcmd, nil, t.goFileName(), args...)
 		if err != nil {
 			t.err = err
 			return
@@ -895,7 +854,7 @@ func (t *test) run() {
 			t.err = fmt.Errorf("write tempfile:%s", err)
 			return
 		}
-		cmdline := []string{"go", "tool", "compile", "-e", "-o", "a.o"}
+		cmdline := []string{findGoCmd(), "tool", "compile", "-e", "-o", "a.o"}
 		cmdline = append(cmdline, flags...)
 		cmdline = append(cmdline, tfile)
 		out, err = runcmd(cmdline...)
@@ -922,6 +881,11 @@ func findExecCmd() []string {
 		return execCmd
 	}
 	execCmd = []string{} // avoid work the second time
+        if *target != "" {
+                execCmd = []string{"go_" + *target + "_exec"}
+                return execCmd
+        }
+
 	if goos == runtime.GOOS && goarch == runtime.GOARCH {
 		return execCmd
 	}
@@ -932,6 +896,14 @@ func findExecCmd() []string {
 	return execCmd
 }
 
+func findGoCmd() string {
+        if *target != "" {
+                return "go_" + *target
+        }
+        return "go"
+}
+
+
 func (t *test) String() string {
 	return filepath.Join(t.dir, t.gofile)
 }