[libc-commits] [clang] [libc] Add clang warning if fp exception functions are called without appropriate flags/pragmas (PR #199009)

[via libc-commits]

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@@ -37,26 +37,41 @@
 namespace LIBC_NAMESPACE_DECL {
 namespace fputil {
 
-LIBC_INLINE int clear_except(int excepts) { return feclearexcept(excepts); }
+LIBC_INLINE int clear_except(int excepts) {
+#pragma STDC FENV_ACCESS ON
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lntue wrote:

Can you move libc changes to a separate PR?  Currently we disable this warning so your PR shouldn't break anything from us? https://github.com/llvm/llvm-project/blob/main/libc/cmake/modules/LLVMLibCCompileOptionRules.cmake#L327

The main reason is that it will be a lot more involved to add this pragma due to compatibility issues with other targets and compilers:
https://godbolt.org/z/dcYheosoY

https://github.com/llvm/llvm-project/pull/199009