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Prior to the removal of STABS support the gdwarf, gstabs, ... options formed a cycle with their Negative(..) option attribute. But that didn't actually have any effect since most of the options also are Joined or JoinedOrMissing for which there's no pruning of options and so once ran into the set_debug_level diagnostics reporting conflicting debug formats. The following removes the remains of that cycle, which is a Negative option from gdwarf to gdwarf-. With RejectNegative added the expected effect of -gdwarf-4 -gdwarf would be to enable DWARF5 support (but this doesn't happen for some reason). I think the more sensible behavior is that seen and implemented in opts.cc, the more specific -gdwarf-4 determines the DWARF level and a later or earlier -gdwarf becomes a no-op. So the Negative(..) annotation on gdwarf is just confusing. * common.opt (gdwarf): Remove Negative(gdwarf-).
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