[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")
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efriedma-quic wrote:

We don't need to hardcode versions here, but we need to have some idea, in general, of what compilers we support.  Like, are we going to add code to support clang 3.0?  Probably not, but have we written that down anywhere?

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