[PATCH] add support for -Wmismatched-dealloc

[Florian Weimer]

* Martin Sebor via Libc-alpha:


> diff --git a/libio/stdio.h b/libio/stdio.h
> index 144137cf67..62814c93db 100644
> --- a/libio/stdio.h
> +++ b/libio/stdio.h

> @@ -202,15 +214,9 @@ extern char *tmpnam_r (char *__s) __THROW __wur;
>     P_tmpdir is tried and finally "/tmp".  The storage for the filename
>     is allocated by `malloc'.  */
>  extern char *tempnam (const char *__dir, const char *__pfx)
> -     __THROW __attribute_malloc__ __wur;
> +  __attribute_malloc__ __wur __attr_dealloc_free __THROW;
>  #endif

This breaks boostrap because in some C++ modes, __THROW (aka noexcept)
needs to come before all attributes.

Further tests are ongoing; this is difficult to do due to general
toolchain breakage (although things have improved lately).

Thanks,
Florian
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