[gcc r13-6283] testsuite: Accept pmf-vbit-in-delta extra warning

[gcc r13-6283] testsuite: Accept pmf-vbit-in-delta extra warning

[Alexandre Oliva]

https://gcc.gnu.org/g:1a45573d3d7b0098116f4ccde5d9be5d32b5653a

commit r13-6283-g1a45573d3d7b0098116f4ccde5d9be5d32b5653a
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Wed Feb 22 14:35:20 2023 -0300

    testsuite: Accept pmf-vbit-in-delta extra warning
    
    cp_build_binary_op, that issues -Waddress warnings, issues an extra
    warning on arm targets, that g++.dg/warn/Waddress-5.C does not expect
    when comparing a pointer-to-member-function literal with null.
    
    The reason for the extra warning is that, on arm targets,
    TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta, which
    causes a different path to be taken, that extracts the
    pointer-to-function and the delta fields (minus the vbit) and compares
    each one with zero.  It's when comparing this pointer-to-function with
    zero, in a recursive cp_build_binary_op, that another warning is
    issued.
    
    I suppose there should be a way to skip the warning in this recursive
    call, without disabling other warnings that might be issued there, but
    this patch only arranges for the test to tolerate the extra warning.
    
    
    for  gcc/testsuite/ChangeLog
    
            * g++.dg/warn/Waddress-5.C: Tolerate extra -Waddress warning.

Diff:
---
 gcc/testsuite/g++.dg/warn/Waddress-5.C | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/warn/Waddress-5.C b/gcc/testsuite/g++.dg/warn/Waddress-5.C
index b1287b2fac3..1de88076f77 100644
--- a/gcc/testsuite/g++.dg/warn/Waddress-5.C
+++ b/gcc/testsuite/g++.dg/warn/Waddress-5.C
@@ -23,7 +23,11 @@ void T (bool);
 void warn_memptr_if ()
 {
   // Exercise warnings for addresses of nonstatic member functions.
-  if (&A::f == 0)         // { dg-warning "the address '&A::f'" }
+  // On targets with TARGET_PTRMEMFUNC_VBIT_LOCATION ==
+  // ptrmemfunc_vbit_in_delta, cp_build_binary_op recurses to compare
+  // the pfn from the ptrmemfunc with null, so we get two warnings.
+  // This matches both.  ??? Should we disable one of them?
+  if (&A::f == 0)         // { dg-warning "A::f" }
     T (0);
 
   if (&A::vf)             // { dg-warning "-Waddress" }