Delete more code

go/tools/builders/compilepkg.go

@@ -529,7 +529,13 @@ func compileArchive(
 	// Pack .o files into the archive. These may come from cgo generated code,
 	// cgo dependencies (cdeps), or assembly.
 	if len(objFiles) > 0 {
-		if err := appendFiles(goenv, outPath, objFiles...); err != nil {
+		// Append files to the archive, using abs to work around long path
+		// issues on Windows.
+		// TODO(jayconrod): copy cmd/internal/archive and use that instead of
+		// shelling out to cmd/pack.
+		args := goenv.goTool("pack", "r", abs(outPath))
+		args = append(args, objFiles...)
+		if err := goenv.runCommand(args); err != nil {
 			return err
 		}
 	}

go/tools/builders/pack.go

@@ -63,28 +63,3 @@ const (
 )
 
 var zeroBytes = []byte("0                    ")
-
-func appendFiles(goenv *env, archive string, files ...string) error {
-	archive = abs(archive) // required for long filenames on Windows.
-
-	// Create an empty archive if one doesn't already exist.
-	// In Go 1.16, 'go tool pack r' reports an error if the archive doesn't exist.
-	// 'go tool pack c' copies export data in addition to creating the archive,
-	// so we don't want to use that directly.
-	_, err := os.Stat(archive)
-	if err != nil && !os.IsNotExist(err) {
-		return err
-	}
-	if os.IsNotExist(err) {
-		if err := os.WriteFile(archive, []byte(arHeader), 0666); err != nil {
-			return err
-		}
-	}
-
-	// Append files to the archive.
-	// TODO(jayconrod): copy cmd/internal/archive and use that instead of
-	// shelling out to cmd/pack.
-	args := goenv.goTool("pack", "r", archive)
-	args = append(args, files...)
-	return goenv.runCommand(args)
-}