Hi CSights, > Is there a way to have g++ tell me which flags it is actually using when > compiling a program. E.g. expand -O1 to the individual optimization flags at > run time? Yes. I use this trick: g++ -O1 -S -fverbose-asm -x c++ <(echo '') -o O1.s cat O1.s > Anyone have any other suggestions? Keep in mind that -O1 or higher turns on many more "behind the scenes" optimizations than just those that are twiddle-able with the -f optimization flags. And keep in mind that -O0 disables all optimizations, irregardless of specified -f optimization flags (which are ignored). HTH, --Eljay
