[compiler-rt] [llvm] [compiler-rt] Add check-builtins target for LLVM_ENABLE_RUNTIMES builds (PR #166837)

[Petr Hosek via llvm-commits]

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@@ -1,6 +1,16 @@
 set(BUILTINS_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 
-set(BUILTINS_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS} builtins)
+# If COMPILER_RT_FORCE_TEST_BUILTINS_DIR is set, the builtins
+# were already built and we are just going to test them.
+# NOTE: This is currently an LLVM-internal option which should
+# only be used by the LLVM_ENABLE_RUNTIMES build configured
+# in llvm/runtimes/CMakeLists.txt
+if(COMPILER_RT_FORCE_TEST_BUILTINS_DIR)
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petrhosek wrote:

I'd consider omitting the `_FORCE` bit a call it just `COMPILER_RT_TEST_BUILTINS_DIR`.

https://github.com/llvm/llvm-project/pull/166837