code review 13352046: cmd/go: build SWIG shared libraries in work directory

src/cmd/go/pkg.go

 // Copyright 2011 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 main
 
 import (
         "bytes"
         "errors"
         "fmt"
@@ skipping 662 matching lines @@
         // package named on the command-line, assume it is up-to-date
         // no matter what the modification times on the source files indicate.
         // This avoids rebuilding $GOROOT packages when people are
         // working outside the Go root, and it effectively makes each tree
         // listed in $GOPATH a separate compilation world.
         // See issue 3149.
         if p.Root != "" && !topRoot[p.Root] {
                 return false
         }
 
-        srcs := stringList(p.GoFiles, p.CFiles, p.CXXFiles, p.HFiles, p.SFiles, p.CgoFiles, p.SysoFiles)
+        srcs := stringList(p.GoFiles, p.CFiles, p.CXXFiles, p.HFiles, p.SFiles, p.CgoFiles, p.SysoFiles, p.SwigFiles, p.SwigCXXFiles)
         for _, src := range srcs {
                 if olderThan(filepath.Join(p.Dir, src)) {
                         return true
                 }
         }
 
-        for _, src := range stringList(p.SwigFiles, p.SwigCXXFiles) {
-                if olderThan(filepath.Join(p.Dir, src)) {
-                        return true
-                }
-                soname := p.swigSoname(src)
-                fi, err := os.Stat(soname)
-                if err != nil {
-                        return true
-                }
-                fiSrc, err := os.Stat(src)
-                if err != nil || fiSrc.ModTime().After(fi.ModTime()) {
-                        return true
-                }
-        }
-
         return false
 }
 
 var cwd, _ = os.Getwd()
 
 var cmdCache = map[string]*Package{}
 
 // loadPackage is like loadImport but is used for command-line arguments,
 // not for paths found in import statements.  In addition to ordinary import paths,
 // loadPackage accepts pseudo-paths beginning with cmd/ to denote commands
@@ skipping 150 matching lines @@
         root = filepath.Clean(root)
         if !strings.HasSuffix(root, sep) {
                 root += sep
         }
         dir = filepath.Clean(dir)
         if !strings.HasPrefix(dir, root) {
                 return "", false
         }
         return filepath.ToSlash(dir[len(root):]), true
 }