According to bug 34352 comment 1, it is incorrect for descriptions in .opt files to span multiple lines. In version 4.4-20081121 there is such a case in config/picochip/picochip.opt:
msymbol-as-address Target Mask(SYMBOL_AS_ADDRESS) Allow a symbol value to be used as an immediate value in an instruction. -- Summary: Multi-line description used in config/picochip/picochip.opt Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: goeran at uddeborg dot se http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38442