I think the general idea is simply that you don't use #ifdef but instead move the conditional compilation logic to the build script / build system. Of course yo

I think the general idea is simply that you don't use #ifdef but instead move the conditional compilation logic to the build script / build system. Of course you should group in files in a way that avoids redundancy. This is the way I'm going about it at least, even though I assume there might be complex situations where the boilerplate isn't warranted and it's better to put all the variants in a single file and use the preprocessor to determine which alternative to compile. Like you say in the end, test features (or maybe standards support), not too-specific things like OS or distribution.