Recusively adding a directory and sub-directories to include path

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I think zig 0.17.0 will let you do it with Configure Cache Poisoning, specifically std.Build.dependOnDirectoryMetadata. That tells the ‘maker’ to rerun the ‘configurer’ if the directory contents changes. NB: it is not recursive.

That said, I recommend listing individual files. Unlike zig, C & C++ don’t have a mechanism for the compiler to determine what code is and isn’t used, so by listing them individually:

  1. It makes it easy for other people reading your project to see what it’s doing.
  2. Your build won’t fail because of a compile error in code you don’t use.