[gcc(refs/users/aoliva/heads/testme)] c++: arm -Wdeprecated fails for ctors

[Alexandre Oliva]

https://gcc.gnu.org/g:bc5fb436045e4425f46e16c9433b5c44370dddec

commit bc5fb436045e4425f46e16c9433b5c44370dddec
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Sun Mar 22 22:32:08 2026 -0300

    c++: arm -Wdeprecated fails for ctors
    
    ARM requires C++ constructors to return the 'this' pointer.  Setting
    that up disables warnings at the ctor location for Wuse_after_free.
    Unfortunately, the nowarn_spec_t mapping maps both Wuse_after_free and
    Wdeprecated_declaration to the same NW_OTHER catchall group, so we
    don't get deprecation warnings for constructors, and libstdc++'s
    20_util/pair/cons/99957.cc fails.
    
    We may want to consider also explicitly mapping Wdeprecated and
    Wdeprecated_declaration to another group, but this minimal change
    appears to be enough.
    
    
    for  gcc/ChangeLog
    
            * gcc-diagnostic-spec.cc (nowarn_spec_t::nowarn_spec_t): Map
            OPT_Wuse_after_free like OPT_Wuse_after_free_.

Diff:
---
 gcc/gcc-diagnostic-spec.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/gcc-diagnostic-spec.cc b/gcc/gcc-diagnostic-spec.cc
index dd631699539d..813625e28773 100644
--- a/gcc/gcc-diagnostic-spec.cc
+++ b/gcc/gcc-diagnostic-spec.cc
@@ -100,6 +100,7 @@ nowarn_spec_t::nowarn_spec_t (opt_code opt)
 
     case OPT_Wdangling_pointer_:
     case OPT_Wreturn_local_addr:
+    case OPT_Wuse_after_free:
     case OPT_Wuse_after_free_:
       m_bits = NW_DANGLING;
       break;