Lakshman wrote: > Can you tell me for a command that yoused for compilation gcc > -pendantic I'm sorry but I don't understand your question. If you want to know what -pedantic does: it's described here: http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Warning-Options.html If you want to know how it does it: it turns on more strict syntax checks in GCC's C parsing code. If you want an example of something that uses -pedantic: GCC uses it when building itself. The idea is that you can bootstrap GCC using another ISO C compiler and so GCC checks that its own C front-end and the back-end conform strictly to ISO C. Hope that helped! Rup.