as: Z

 
 2.18 Generate Object File in Spite of Errors: '-Z'
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 After an error message, 'as' normally produces no output.  If for some
 reason you are interested in object file output even after 'as' gives an
 error message on your program, use the '-Z' option.  If there are any
 errors, 'as' continues anyways, and writes an object file after a final
 warning message of the form 'N errors, M warnings, generating bad object
 file.'