c++: constexpr, trivial, and non-alias target [PR111075]
On Darwin and other targets with !can_alias_cdtor, we instead go to
maybe_thunk_ctor, which builds a thunk function that calls the general
constructor. And then cp_fold tries to constant-evaluate that call, and we
ICE because we don't expect to ever be asked to constant-evaluate a call to
a trivial function.
No new test because this fixes g++.dg/torture/tail-padding1.C on affected
targets.
PR c++/111075
gcc/cp/ChangeLog:
* constexpr.cc (cxx_eval_call_expression): Allow trivial
call from a thunk.
diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc
index dc59f59..4346b29 100644
--- a/gcc/cp/constexpr.cc
+++ b/gcc/cp/constexpr.cc
@@ -3103,6 +3103,9 @@
we can only get a trivial function here with -fno-elide-constructors. */
gcc_checking_assert (!trivial_fn_p (fun)
|| !flag_elide_constructors
+ /* Or it's a call from maybe_thunk_body (111075). */
+ || (TREE_CODE (t) == CALL_EXPR ? CALL_FROM_THUNK_P (t)
+ : AGGR_INIT_FROM_THUNK_P (t))
/* We don't elide constructors when processing
a noexcept-expression. */
|| cp_noexcept_operand);
