[gcc r9-10172] c++: operator new lookup [PR98249]

[gcc r9-10172] c++: operator new lookup [PR98249]

[Jason Merrill]

https://gcc.gnu.org/g:86d50501e487597d8b97f40d1c87dfcd694a9441

commit r9-10172-g86d50501e487597d8b97f40d1c87dfcd694a9441
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 65fbff3b893..53ca229b909 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -4584,7 +4584,6 @@ 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;
+}