Hi Paulo, > Thanks Eljay for the quick answer. Your answer help me a lot, specially about the TRACE trick. You are most welcome. :-) > About the "reserved symbols", I tried to discover it and didn't found anywhere. Is there any command or gcc parameter to know the reserved symbols? The only way that I got is to create a program to print all known defines. ALL symbols that begin with a single underscore and a capital letter are reserved, as per the C++ language specification (ISO 14882). ALL symbols that have two underscores ANYWHERE in there name are reserved, as per the C++ language specification (ISO 14882). Using the magic of GCC's preprocessor, you can get a listing of all #define's in your translation unit (compilation): For example, to see all the compiler pre-#define's: touch Empty.cpp g++ -E -dM Empty.cpp | sort For example: echo "#include <iostream>" > JustIostream.cpp g++ -E -dM JustIostream.cpp | sort Along those same diagnostic lines, here's a trick to see the optimization flags: touch Empty.cpp g++ -O2 -fverbose-asm -S Empty.cpp -o - Note that not all optimizations have twiddle-able -f switches. Also note that if optimizations are disabled (-O0), then none of the -f switches have any bearing. The one's that are displayed for -O0 using this trick are fallow. Sincerely, --Eljay
