1 files changed, 33 insertions, 0 deletions
diff --git a/src/cmd/cover/testdata/toolexec.go b/src/cmd/cover/testdata/toolexec.go
new file mode 100644
index 0000000..458adae
--- /dev/null
+++ b/src/cmd/cover/testdata/toolexec.go
@@ -0,0 +1,33 @@
+// Copyright 2018 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.
+
+// The toolexec program is a helper program for cmd/cover tests.
+// It is used so that the go tool will call the newly built version
+// of the cover program, rather than the installed one.
+//
+// The tests arrange to run the go tool with the argument
+//    -toolexec="/path/to/toolexec /path/to/testcover"
+// The go tool will invoke this program (compiled into /path/to/toolexec)
+// with the arguments shown above followed by the command to run.
+// This program will check whether it is expected to run the cover
+// program, and if so replace it with /path/to/testcover.
+package main
+
+import (
+	exec "internal/execabs"
+	"os"
+	"strings"
+)
+
+func main() {
+	if strings.HasSuffix(strings.TrimSuffix(os.Args[2], ".exe"), "cover") {
+		os.Args[2] = os.Args[1]
+	}
+	cmd := exec.Command(os.Args[2], os.Args[3:]...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		os.Exit(1)
+	}
+}