func elfbuildinfo(sh *ElfShdr, startva uint64, resoff uint64) int {
	n := int(ELF_NOTE_BUILDINFO_NAMESZ + Rnd(int64(len(buildinfo)), 4))
	return elfnote(sh, startva, resoff, n)
}

func elfgobuildid(sh *ElfShdr, startva uint64, resoff uint64) int {
	n := len(ELF_NOTE_GO_NAME) + int(Rnd(int64(len(*flagBuildid)), 4))
	return elfnote(sh, startva, resoff, n)
}

func elfwritebuildinfo(out *OutBuf) int {

)

var (
	errBadELF    = errors.New("malformed ELF binary")
	errNoBuildID = errors.New("no NT_GNU_BUILD_ID found in ELF binary")
)

// elfBuildID returns the GNU build ID of the named ELF binary,
// without introducing a dependency on debug/elf and its dependencies.
func elfBuildID(file string) (string, error) {
	buf := make([]byte, 256)
	f, err := os.Open(file)
	if err != nil {
		return "", err
	}
	defer f.Close()

		// Let's try not doing this and see what breaks.
		// If we do need it, it would go here, before we
		// enter the mappings into b.mem in the first place.

		buildID, _ := elfBuildID(file)
		addMapping(lo, hi, offset, file, buildID)
	}
}

func (b *profileBuilder) addMapping(lo, hi, offset uint64, file, buildID string) {
	b.addMappingEntry(lo, hi, offset, file, buildID, false)
}