[gcc r10-10719] c++: operator new lookup [PR98249]

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:6c69f7c449cc1c0d48e13b8680023a59f541260e

commit r10-10719-g6c69f7c449cc1c0d48e13b8680023a59f541260e
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 29e4a52b6c4..49eb673ebcc 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -4682,7 +4682,6 @@ build_operator_new_call (tree fnname, vec<tree, va_gc> **args,
 
      we disregard block-scope declarations of "operator new".  */
   fns = lookup_name_real (fnname, 0, 1, /*block_p=*/false, 0, 0);
-  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;
+}