Is there a command that tells the compiler to print its version? - c

Question

I need to upload my assignments to an online compiler, I was told it's GCC but I'm getting segfault on the online compiler but not when compiling with VS or on linux's GCC.
Is there a way to make compiler print what compiler is it and its version?

Answer 1

usually there isn't a single command.
you can try and check compiler defined macros.
cmake does this, it has a wide array of checks to detect compiler versions.
It compiles code and prints a "vendor string" based on preprocessor symbols.
here is for instance the code for gcc: https://github.com/Kitware/CMake/blob/master/Modules/Compiler/GNU-DetermineCompiler.cmake
since clang is drop in replacement for gcc you might also want to check the macros used here:
https://github.com/Kitware/CMake/blob/master/Modules/Compiler/Clang-C-FeatureTests.cmake
Edit:
So a running C example would do the following:
#include <stdio.h>
int main(int argc, char **argv) {
#ifdef __clang_major__
printf ("clang detected version %d.%d\n", __clang_major__, __clang_minor__);
#endif
#ifdef __GNUC__
// note that clang 3.7 declares itself as a gcc 4.2"
printf ("gcc detected version %d.%d\n", __GNUC__, __GNUC_MINOR__);
#endif
}
output for clang:
$ clang main.cc
$ ./a.out
clang detected version 3.7
gcc detected version 4.2
output for gcc:
$ gcc main.cc
$ ./a.out
gcc detected version 4.8