static-analysis

I'd like to see all the places in my code (C++) which disregard return value of a function. How can I do it - with gcc or static code analysis tool? Bad code example: int f(int z) { return z + (z*2) + z/3 + z*z + 23; } int main() { int i = 7; f(i); ///// <<----- here I disregard the return value return 1; } Please note that: it should work even if the function and its use are in different files free static check tool You want GCC's warn_unused_result attribute: #define WARN_UNUSED __attribute__((warn_unused_result)) int WARN_UNUSED f(int z) { return z + (z*2) + z/3 + z*z + 23; } int main() {