Re: [PATCH 4/5] wined3d: Prefer the core glActiveTexture function. (v2)

[Henri Verbeet]

On 8 January 2015 at 15:07, Matteo Bruni  wrote:
> - #define MAP_GL_FUNCTION(core_func, ext_func)                                  \
> - {                                                                             \
> -
>    if (!gl_info->gl_ops.ext.p_##core_func)                                   \
> -
>        gl_info->gl_ops.ext.p_##core_func = gl_info->gl_ops.ext.p_##ext_func; \
> - }
> -
> - MAP_GL_FUNCTION(glActiveTexture, glActiveTextureARB);
>
> +#undef MAP_GL_FUNCTION

That probably works here in practice, but in general you want to avoid
defining macros like that. See e.g.
https://gcc.gnu.org/onlinedocs/cpp/Swallowing-the-Semicolon.html for
the explanation.