[llvm] [libc] [libc][math] Add initial support for C23 float128 math functions, starting with copysignf128. (PR #71731)

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@@ -245,6 +245,7 @@ option(LIBC_INCLUDE_DOCS "Build the libc documentation." ${LLVM_INCLUDE_DOCS})
 
 include(CMakeParseArguments)
 include(LLVMLibCCheckCpuFeatures)
+include(check_compiler_features)
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lntue wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/71731