================
@@ -3452,9 +3452,10 @@ def Fmod : FPMathTemplate, LibBuiltin<"math.h"> {
def Frexp : FPMathTemplate, LibBuiltin<"math.h"> {
let Spellings = ["frexp"];
- let Attributes = [NoThrow];
+ let Attributes = [NoThrow, Constexpr];
----------------
hubert-reinterpretcast wrote:
> IMO we'd probably want to introduce the concept of "constexpr since C++xy".
@philnik777, are you envisioning something where `LangOptions` are passed into
`Builtin::Context::isConstantEvaluated`?
https://github.com/llvm/llvm-project/blob/fb2c6597e39e9e1a775525ea0236b2f89e46acff/clang/include/clang/Basic/Builtins.h#L279
I think the existing `Constexpr`/"`E`" attribute can be left alone for use in
"always `constexpr`" cases.
For the selectively-`constexpr` cases, `LibBuiltin` in
`clang/include/clang/Basic/BuiltinsBase.td` should have
`OnlyBuiltinPrefixedAliasIsConstexpr` renamed to
`BuiltinPrefixedAliasIsConstexpr`. Then adding a new string property for
`UnprefixedOnlyConstexprSince` makes sense to me. It can be encoded into
`Builtin::Info` (and I think using the `LangFeatures` enumeration from
`"clang/Basic/LangStandard.h"` is not terribly wrong).
https://github.com/llvm/llvm-project/pull/88978
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