================
@@ -247,10 +247,35 @@ llvm::Constant
*CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
Name = Context.BuiltinInfo.getName(BuiltinID).substr(10);
}
+ // If no standard library declaration was found in the AST (freestanding
+ // code calling builtins directly without headers), perform automatic
+ // resolution of MSVC CRT symbol names and DLL import attributes.
+ bool IsNoHeader = (D == GlobalDecl(FD));
+ if (IsNoHeader && getTriple().isWindowsMSVCEnvironment() &&
+ Name == "hypotf") {
+ // Map C99 float math functions to their MSVC CRT prefixed names on
Windows.
+ // (Only hypotf needs mapping as it is not exported without prefix in UCRT
+ // on both x86 and x64).
+ Name = "_hypotf";
----------------
ChuanqiXu9 wrote:
I really don't like to hardcoding builtin names here. It looks too ad-hoc.
https://github.com/llvm/llvm-project/pull/207135
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