if usePkgCache {
		if _, ok := pkgTags[dir]; !ok {
			pkgTags[dir] = info.AllTags
			key = tagKey(dir, context, info.AllTags)
		}
	}

	filenames := append(append([]string{}, info.GoFiles...), info.CgoFiles...)

	// Parse package files.
	var files []*ast.File
	for _, file := range filenames {
		f, err := w.parseFile(dir, file)
		if err != nil {
			log.Fatalf("error parsing package %s: %s", name, err)

			if err := adbCopyTree(deviceCwd, importPath); err != nil {
				return 0, err
			}

			// Copy .go files from the package.
			goFiles, err := filepath.Glob("*.go")
			if err != nil {
				return 0, err
			}
			if len(goFiles) > 0 {
				args := append(append([]string{"push"}, goFiles...), deviceCwd)
				if err := adb(args...); err != nil {
					return 0, err
				}
			}
		}
	}

to auto-update code from Go 1.14 and earlier:

	go tool fix -r eglconf <pkg>

# Using cgo directly

Usage:

	go tool cgo [cgo options] [-- compiler options] gofiles...

Cgo transforms the specified input Go source files into several output
Go and C source files.

The compiler options are passed through uninterpreted when

pkg go/build, type Package struct, CgoCFLAGS []string
pkg go/build, type Package struct, CgoFiles []string
pkg go/build, type Package struct, CgoLDFLAGS []string
pkg go/build, type Package struct, CgoPkgConfig []string
pkg go/build, type Package struct, Dir string
pkg go/build, type Package struct, Doc string
pkg go/build, type Package struct, GoFiles []string
pkg go/build, type Package struct, Goroot bool