Re: [PATCH] Fix const pointer warning in gthr-win32.h

["Kaveh R. Ghazi" <ghazi@caip.rutgers.edu>]

From: "Ian Lance Taylor" <iant@google.com>

> "Aaron W. LaFramboise" <aaronavay62@aaronwl.com> writes:
>
>> OK, I discovered this file is also used in other places outside of GCC
>> such as in libgfortran, so using tsystem.h is not OK there.  What is
>> the  proper way to make this error go away then, as I understand the
>> union trick is the only way to silence it?

Is it possible to fix (i.e. const-ify) the relevant function prototypes, or
do you end up calling a system interface that's non-const and get stuck?


>> By the way, I think this prototype is actually incorrect.  The ptr
>> parameter really should not be const, because __gthread_getspecific
>> returns a non-const void *.  However, I'm not sure if there's some
>> other reason this should be const; does anyone know about this?
>
> What code are you compiling when you see this warning?  As far as I
> know code that uses gthr-win32.h is mostly C code which should be
> compiled with -Wc++-compat.
> Ian

I think the warning comes from -Wcast-qual, not -Wc++-compat.

        --Kaveh