Well, yeah. If you have any reason to suspect that you will need to run your code on other platforms or compile with other compilers, don't do compiler-specific things. Just do it cross-platform the first time.
Hell, even if you don't think you'll ever need to do that, you should still avoid doing things that are platform or compiler specific.
Hell, even if you don't think you'll ever need to do that, you should still avoid doing things that are platform or compiler specific.