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--optimize_with_debug in 6.1.x

We use the -gt option to get structure information about variables for some of our own debug tools.  We do not use the debugger.  Unfortunately -gt disables some optimizations.  I ran into an option --optimize_with_debug that results in the variable information still being available but apparently turns on all the optimizations that are normally disabled with -gt.  It now appears that --optimize_with_debug is documented for 7.0, but not 6.0 or 6.1.  It appears to be recognized by 6.0 and 6.1.  Is --optimize_with_debug supported in 6.0? 6.1? Is it recommended given that we don't want to run any debuggers but want the variable information in the coff symbol table?