go/build: fix build (revert test changes)

R=adg
TBR=adg
CC=golang-dev
https://golang.org/cl/5024046

src/pkg/go/build/build_test.go

@@ -49,8 +49,6 @@ var buildPkgs = []struct {
 			CFiles:   []string{"cgotest.c"},
 			Imports:  []string{"C", "unsafe"},
 			Package:  "cgotest",
-			CgoLDFLAGS:   []string{"-lregexp"},
-			CgoPkgConfig: []string{"cairo", "moscow"},
 		},
 	},
 }
@@ -58,11 +56,10 @@ var buildPkgs = []struct {
 const cmdtestOutput = "3"
 
 func TestBuild(t *testing.T) {
-	var ctxt = Context{GOOS: "darwin", GOARCH: "amd64"}
 	for _, tt := range buildPkgs {
 		tree := Path[0] // Goroot
 		dir := filepath.Join(tree.SrcDir(), tt.dir)
-		info, err := ctxt.ScanDir(dir)
+		info, err := ScanDir(dir)
 		if err != nil {
 			t.Errorf("ScanDir(%#q): %v", tt.dir, err)
 			continue
@@ -72,13 +69,6 @@ func TestBuild(t *testing.T) {
 			continue
 		}
 
-		if tt.dir == "go/build/cgotest" {
-			// Don't actually run cgo.
-			// Among other things our test depends
-			// on pkg-config, which is not present on all systems.
-			continue
-		}
-
 		s, err := Build(tree, tt.dir, info)
 		if err != nil {
 			t.Errorf("Build(%#q): %v", tt.dir, err)

src/pkg/go/build/cgotest/cgotest.go

@@ -6,9 +6,6 @@ package cgotest
 
 /*
 char* greeting = "hello, world";
-#cgo darwin/amd64 LDFLAGS: -lregexp
-#cgo linux CFLAGS: -m32
-#cgo pkg-config: cairo moscow
 */
 // #include "cgotest.h"
 import "C"