[compiler-rt] [compiler-rt][cmake] Test COMPILER_RT_HAS_AARCH64_SME with arm64 (PR #141115)

[Eli Friedman via llvm-commits]

================
@@ -41,14 +41,14 @@ asm(\".arch armv8-a+lse\");
 asm(\"cas w0, w1, [x2]\");
 ")
 
-builtin_check_c_compiler_source(COMPILER_RT_HAS_AARCH64_SME
+builtin_check_c_compiler_source_with_flags(COMPILER_RT_HAS_AARCH64_SME
 "
 void foo(void)  __arm_streaming_compatible {
   asm(\".arch armv9-a+sme2\\n\"
       \"smstart\\n\"
       \"ldr zt0, [sp]\");
 }
-")
+" "-target aarch64-linux-gnu")
----------------
efriedma-quic wrote:

Do we document somewhere which compilers are supported to build compiler-rt?  If we support non-clang compilers, this test won't work on such compilers.  (And if we don't support non-clang compilers, why are we checking this?)

https://github.com/llvm/llvm-project/pull/141115