================
@@ -3043,11 +3056,23 @@ bool Sema::FindAllocationFunctions(
// If no matching function is found and the allocated object type has
// new-extended alignment, the alignment argument is removed from the
// argument list, and overload resolution is performed again.
+ //
+ // C++20 [expr.new]p18:
+ // If no matching function is found then
+ // — if the allocated object type has new-extended alignment, the
+ // alignment argument is removed from the argument list;
+ // — otherwise, an argument that is the type’s alignment and has type
+ // std::align_val_t is added into the argument list immediately
+ // after the first argument;
+ // and then overload resolution is performed again.
+ bool UseFallback = isAlignedAllocation(OriginalAlignedAllocationMode) ||
+ (getLangOpts().CPlusPlus20 && getStdAlignValT());
----------------
cor3ntin wrote:
Yes, this should be applied in all language modes
https://github.com/llvm/llvm-project/pull/203832
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