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This is a new draft of D28234. I previously did the unorthodox thing of pushing to it when I wasn't the original author, but since this version - Uses `GNUInstallDirs`, rather than mimics it, as the original author was hesitant to do but others requested. - Is much broader, effecting many more projects than LLVM itself. I figured it was time to make a new revision. I am using this patch (and many back-ports) as the basis of https://github.com/NixOS/nixpkgs/pull/111487 for my distro (NixOS). It looked like people were generally on board in D28234, but I make note of this here in case extra motivation is useful. --- As pointed out in the original issue, a central tension is that LLVM already has some partial support for these sorts of things. For example `LLVM_LIBDIR_SUFFIX`, or `COMPILER_RT_INSTALL_PATH`. Because it's not quite clear yet what to do about those, we are holding off on changing libdirs and `compiler-rt`. for this initial PR. --- On the advice of @lebedev.ri, I am splitting this up a bit per subproject, starting with LLVM. To allow it to be more easily reviewed. This and the subsequent patch must be landed together, as this will not build alone. But the rest can be landed on their own. Reviewed By: compnerd Differential Revision: https://reviews.llvm.org/D100810