[libclc] [libclc] Add initial support for libclc execution conformance tests (PR #214072)

[Wenju He via cfe-commits]

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@@ -6,6 +6,33 @@ else()
   set(LIBCLC_TARGET_CPU "")
 endif()
 
+include(CheckCXXCompilerFlag)
+
+set(LIBCLC_TEST_ARCHITECTURE "" CACHE STRING
+  "Architecture for libclc execution tests; 'native' or a specific name")
+
+set(LIBCLC_OFFLOAD_LIBDIR "")
+
+if(NOT LIBCLC_TEST_ARCHITECTURE)
+  check_cxx_compiler_flag("-march=native" LIBCLC_HAS_NATIVE_DEVICE)
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wenju-he wrote:

is this checking host target support for -march=native rather than libclc target?

https://github.com/llvm/llvm-project/pull/214072