I'm trying to compile C and C++ sources together using GCC. gcc -std=c++0x test.cpp -std=c99 test.c -lstdc++ Now, this works fine, except that I get two warnings. cc1plus: warning: command line option "-std=c99" is valid for C/ObjC but not for C++ cc1: warning: command line option "-std=c++0x" is valid for C++/ObjC++ but not for C Therefore I can't use -Werror with this setup. Can these warnings b