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892260d7f3
- 47afaf2eb02b1424a9aba241ccd02393a0cbc648 changed llvm-exegesis cmake rules
- 5b2f838db42ea190fdda147a33b5f0fcc8145689 ported them to bazel, but did so by adding all the `lib/{target}/*.cpp` sources in exegesis to the build rule
- c7bf9d084d037aa6c8fd479be9ccdf963dc59e10 removed it, because it breaks users who don't build Mips and fail when building `lib/Mips/*.cpp`. But that in turn breaks those who *do* build the Mips target.
This should hopefully fix it for the final time by using selectively build subdirectories of exegesis target libs using llvm_target_exegesis, which is derived from llvm_targets, and is the list that can vary based on the downstream user.
I verified this builds with and without `Mips` in the `DEFAULT_TARGETS` configure list, and also double checked with `bazel query --output=build @llvm-project//llvm:Exegesis` that `lib/Mips/Target.cpp` is being included if and only if `Mips` is in the target list.
Reviewed By: aeubanks
Differential Revision: https://reviews.llvm.org/D134512