dwarf_add_weakname(3) on FreeBSD
The text c4ac068c83f1, as FreeBSD 12.0-RELEASE, FreeBSD 11.4-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE, FreeBSD 11.0-RELEASE shipped it.
add information about a weak object to a DWARF producer instance