-debug-gcc
		Debugging option. Trace C compiler execution and output.
	-dynimport file
		Write list of symbols imported by file. Write to
		-dynout argument or to standard output. Used by go
		build when building a cgo package.
	-dynlinker
		Write dynamic linker as part of -dynimport output.
	-dynout file
		Write -dynimport output to file.
	-dynpackage package
		Set Go package for -dynimport output.

func portRemoved(feature string) bool {
	return strings.Contains(feature, "(darwin-386)") ||
		strings.Contains(feature, "(darwin-386-cgo)")
}

func compareAPI(w io.Writer, features, required, exception []string) (ok bool) {
	ok = true

	featureSet := set(features)
	exceptionSet := set(exception)

	sort.Strings(features)
	sort.Strings(required)