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

[Amara Emerson 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")
----------------
aemerson wrote:

If I'm understanding your point right, I think the question of what we support for compiler-rt in *general* is something I don't know. I can only speak for this SME feature test.

If I had to guess: the de-facto compiler we support has always been clang since the runtime was intended to be a companion, a la libgcc. It wasn't intended to always be rev-locked to a particular clang since before the monorepo transition it wasn't coupled at the svn level.

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