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To: cygwin AT cygwin DOT com
Subject: Re: new c++ new/delete overloads need wrapping?
In-Reply-To: <81535510-8360-1c72-442a-0b630a6d937f@jdrake.com> (Jeremy Drake
 via Cygwin's message of "Thu, 24 Jul 2025 22:41:04 -0700 (PDT)")
References: <81535510-8360-1c72-442a-0b630a6d937f AT jdrake DOT com>
Date: Sat, 02 Aug 2025 13:35:15 +0200
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From: ASSI via Cygwin <cygwin AT cygwin DOT com>
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Jeremy Drake via Cygwin writes:
> I was looking into C++ new/delete --wrap linker options, and noticed that
> in a quick test the wrapper for delete was not being called.  This was
> because delete is being compiled to _ZdlPvm and that symbol is not present
> in the --wrap arguments in the GCC spec, and is not part of the
> per_process_cxx_malloc struct.  I'm not seeing anything in that cxx_malloc
> struct like a size or version number, so I don't know a good way to
> extend it given that it is part of the startup code linked into every
> binary.

So, something like this?

--8<---------------cut here---------------start------------->8---
diff --git a/gcc/config/i386/cygwin-w64.h b/gcc/config/i386/cygwin-w64.h
index 8180d27c971..177e8203715 100644
--- a/gcc/config/i386/cygwin-w64.h
+++ b/gcc/config/i386/cygwin-w64.h
@@ -28,13 +28,24 @@ along with GCC; see the file COPYING3.  If not see
    malloc-like operators.  See N2800 #17.6.4.6 [replacement.functions] */
 #undef CXX_WRAP_SPEC_LIST
 #define CXX_WRAP_SPEC_LIST " \
-  --wrap _Znwm \
-  --wrap _Znam \
-  --wrap _ZdlPv \
-  --wrap _ZdaPv \
+  --wrap _ZnwmSt11align_val_tRKSt9nothrow_t \
+  --wrap _ZnwmSt11align_val_t \
   --wrap _ZnwmRKSt9nothrow_t \
+  --wrap _Znwm \
+  --wrap _ZnamSt11align_val_tRKSt9nothrow_t \
+  --wrap _ZnamSt11align_val_t \
   --wrap _ZnamRKSt9nothrow_t \
+  --wrap _Znam \
+  --wrap _ZdlPvmSt11align_val_t \
+  --wrap _ZdlPvm \
+  --wrap _ZdlPvSt11align_val_tRKSt9nothrow_t \
+  --wrap _ZdlPvSt11align_val_t \
   --wrap _ZdlPvRKSt9nothrow_t \
+  --wrap _ZdlPv \
+  --wrap _ZdaPvmSt11align_val_t \
+  --wrap _ZdaPvm \
+  --wrap _ZdaPvSt11align_val_tRKSt9nothrow_t \
+  --wrap _ZdaPvSt11align_val_t \
   --wrap _ZdaPvRKSt9nothrow_t \
 "
 
--8<---------------cut here---------------end--------------->8---

The symbols were in reverse order, so I kept it that way.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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