[gcc r11-9830] c++: operator new lookup [PR98249]

[gcc r11-9830] c++: operator new lookup [PR98249]

[Jason Merrill]

https://gcc.gnu.org/g:7aa5f05583066f5b3146c999319288631c75597f

commit r11-9830-g7aa5f05583066f5b3146c999319288631c75597f
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Apr 11 13:06:05 2022 -0400

    c++: operator new lookup [PR98249]
    
    The standard says, as we quote in the comment just above, that if we don't
    find operator new in the allocated type, it should be looked up in the
    global scope.  This is specifically ::, not just any namespace, and we
    already give an error for an operator new declared in any other namespace.
    
            PR c++/98249
    
    gcc/cp/ChangeLog:
    
            * call.c (build_operator_new_call): Just look in ::.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/lookup/new3.C: New test.

Diff:
---
 gcc/cp/call.c                      |  1 -
 gcc/testsuite/g++.dg/lookup/new3.C | 10 ++++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 13cb308f088..55bb9c45f8c 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -4764,7 +4764,6 @@ build_operator_new_call (tree fnname, vec<tree, va_gc> **args,
 
      we disregard block-scope declarations of "operator new".  */
   fns = lookup_name (fnname, LOOK_where::NAMESPACE);
-  fns = lookup_arg_dependent (fnname, fns, *args);
 
   if (align_arg)
     {
diff --git a/gcc/testsuite/g++.dg/lookup/new3.C b/gcc/testsuite/g++.dg/lookup/new3.C
new file mode 100644
index 00000000000..36afb5b48e2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/new3.C
@@ -0,0 +1,10 @@
+// PR c++/98249
+
+#include <new>
+struct Incomplete;
+template<class T> struct Holder { T t; };
+Holder<Incomplete> *p;
+void test() {
+    ::new (p) int;
+    new (p) int;
+}