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Date: Sat, 2 Aug 2025 10:47:25 -0700 (PDT)
X-X-Sender: jeremyd AT resin DOT csoft DOT net
To: ASSI <Stromeko AT nexgo DOT de>
cc: cygwin AT cygwin DOT com
Subject: Re: new c++ new/delete overloads need wrapping?
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From: Jeremy Drake via Cygwin <cygwin AT cygwin DOT com>
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On Sat, 2 Aug 2025, ASSI via Cygwin wrote:

> 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.

Pretty much, but I think you lost _ZdaPv in the reshuffle.

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