[PATCH] D100729: [Docs] Mention LLVM_EXPERIMENTAL_TARGETS_TO_BUILD variable in CMake.rst

[Min-Yih Hsu via Phabricator via llvm-commits]

myhsu added a comment.

In D100729#2697609 <https://reviews.llvm.org/D100729#2697609>, @thakis wrote:

> Can we add some words on how to find valid values to set this to?

IIRC LLVM doesn't have a list of experimental targets in any of the CMake files (LLVM only has a list of targets built by default). The only way to find out is subtracting all folder names under `llvm/lib/Target` by the value of `LLVM_ALL_TARGETS` cmake variable inside `llvm/CMakeLists.txt`


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