llvm-project/libcxx/cmake/caches/Generic-cxx20.cmake

set(LIBCXX_TEST_PARAMS "std=c++2a" CACHE STRING "")
set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")
[runtimes] Allow passing Lit parameters through CMake This allows passing parameters to the test suites without using LLVM_LIT_ARGS. The problem is that we sometimes want to set some Lit arguments on the CMake command line, but the Lit parameters in a CMake cache file. If the only knob to do that is LLVM_LIT_ARGS, the command-line entry overrides the cache one, and the parameters set by the cache are ignored. This fixes a current issue with the build bots that they completely ignore the 'std' param set by Lit, because other Lit arguments are provided via LLVM_LIT_ARGS on the CMake command-line. 2020-07-09 23:54:09 +08:00			`set(LIBCXX_TEST_PARAMS "std=c++2a" CACHE STRING "")`
			`set(LIBCXXABI_TEST_PARAMS "${LIBCXX_TEST_PARAMS}" CACHE STRING "")`