   RTTI macro & g++
  Hi,I cant seem to find any macro that is defined if g++ has rtti enabled or not.According to a document I read somewhere __RTTI should be defined, but that doesnt seem to be the case.Does anyone know if a macro does get defined, and what it is? Alternatively a way to create an error at compile-time if rtti is not available?(turn of rtti via : g++ -fno-rtti)Thanks. 
  Do you mean you can't find it defined in a file?It won't be in a file but it will be as if its defined on the command line.Try compiling this with the rtti enabled/disabled #include <iostream>int main() {#ifdef __RTTI    std::cout << "Rtti enabled\n";#endif#ifndef __RTTI    std::cout << "Rtti disabled\n";#endif    return 0;}Some docs I found said it was only for Tru64 so maybe that's your problem.   [edited by - petewood on March 25, 2004 4:23:24 AM];  Hi yeah, thanks, I tried that.Perhaps I have the RTTI switches wrong?g++ -fno-rttiand g++ -frttialso, if you use the -v option, I assume gcc displays all the #defines? is this correct? because I cant see any difference in the information it displays if rtti is enabled/disabled.quote:Alternatively a way to create an error at compile-time if rtti is not available?Any ideas? 