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Some projects need to add conditional dependencies on other projects. compiler-rt is already doing this, and I attempted to add this to debuginfo-tests when I ran into the ordering problem, that you can't conditionally add a dependency unless that dependency's CMakeLists.txt has already been run (which would allow you to say if (TARGET foo). The solution to this seems to be to determine very early on the entire set of projects which is enabled. This is complicated by the fact that there are multiple ways to enable projects, and different tree layouts (e.g. mono-repo, out of -tree, external, etc). This patch attempts to centralize all of this into one place, and then updates compiler-rt to demonstrate as a proof of concept how this can simplify code. Differential Revision: https://reviews.llvm.org/D37637 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313091 91177308-0d34-0410-b5e6-96231b3b80d8
See docs/CMake.html for instructions on how to build LLVM with CMake.