If the reply is correct, the only issue there is that they're compiling in C89 mode. If you pass `-pedantic -std=c89` to GCC, it too will warn on C99+ features.

If the reply is correct, the only issue there is that they're compiling in C89 mode. If you pass `-pedantic -std=c89` to GCC, it too will warn on C99+ features. If you pass `/std:c11` or `/std:c17` to MSVC, C99+ features should work.