Common Report Var(flag_rtl_seqabstr)
Perform sequence abstraction optimization on RTL
-fshared-data
-Common Report Var(flag_shared_data)
-Mark data as shared rather than private
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fshow-column
Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on