cmd/go: fix swig support and run swig tests during run.bash

(The tests only run when swig is already installed on the local system.)

Change-Id: I172d106a68cfc746a1058f5a4bcf6761bab88912
Reviewed-on: https://go-review.googlesource.com/78175
Reviewed-by: Ian Lance Taylor <iant@golang.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/misc/swig/stdio/file.go b/misc/swig/stdio/file.go
new file mode 100644
index 0000000000..a582f776f6
--- /dev/null
+++ b/misc/swig/stdio/file.go
@@ -0,0 +1,15 @@
+// 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.
+
+// This file is here just to cause problems.
+// file.swig turns into a file also named file.go.
+// Make sure cmd/go keeps them separate
+// when both are passed to cgo.
+
+package file
+
+//int F(void) { return 1; }
+import "C"
+
+func F() int { return int(C.F()) }
diff --git a/misc/swig/stdio/file_test.go b/misc/swig/stdio/file_test.go
index b1a520e6bc..aea92aafd5 100644
--- a/misc/swig/stdio/file_test.go
+++ b/misc/swig/stdio/file_test.go
@@ -20,3 +20,9 @@ func TestRead(t *testing.T) {
 		t.Error("fclose failed")
 	}
 }
+
+func TestF(t *testing.T) {
+	if x := F(); x != 1 {
+		t.Fatalf("x = %d, want 1", x)
+	}
+}