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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98130] [11 regression] placement new fails on
 webkit-gtk-2.28.4 since r11-4745-g58c9de46541ade79
Date: Fri, 04 Dec 2020 11:37:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98130

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That would mean:

--- gcc/testsuite/g++.dg/opt/pr98130.C.jj       2020-12-04 12:30:11.5109884=
04
+0100
+++ gcc/testsuite/g++.dg/opt/pr98130.C  2020-12-04 12:33:05.663028984 +0100
@@ -0,0 +1,25 @@
+// PR c++/98130
+// { dg-do run { target c++11 } }
+// { dg-options "-O2" }
+
+#include <new>
+
+typedef int *T;
+
+static unsigned char storage[sizeof (T)] alignas (T);
+static T *p =3D (T *) storage;
+
+static inline __attribute__((__always_inline__)) void
+foo (T value)
+{
+  new (p) T(value);
+}
+
+int
+main ()
+{
+  int a;
+  foo (&a);
+  if (!*p)
+    __builtin_abort ();
+}
--- gcc/gimple.c.jj     2020-11-26 01:14:47.528081989 +0100
+++ gcc/gimple.c        2020-12-04 12:34:44.865911907 +0100
@@ -1514,11 +1514,12 @@ gimple_call_fnspec (const gcall *stmt)
      such operator, then we can treat it as free.  */
   if (fndecl
       && DECL_IS_OPERATOR_DELETE_P (fndecl)
+      && DECL_IS_REPLACEABLE_OPERATOR (fndecl)
       && gimple_call_from_new_or_delete (stmt))
     return ".co ";
   /* Similarly operator new can be treated as malloc.  */
   if (fndecl
-      && DECL_IS_OPERATOR_NEW_P (fndecl)
+      && DECL_IS_REPLACEABLE_OPERATOR_NEW_P (fndecl)
       && gimple_call_from_new_or_delete (stmt))
     return "mC";
   return "";

but the testcase is miscompiled even with that change, and we don't really
return ".co " nor "mC" on the testcase.=