Re: [Fink-devel] adding FAQ entries?

[Alexander H. <ale...@gm...>]

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Jack Howarth wrote:
> On Mon, Aug 31, 2009 at 03:05:58PM -0400, Alexander Hansen wrote:
> Jack Howarth wrote:
>>>>    Can someone help me to add a FAQ entry in...
>>>>
>>>> http://www.finkproject.org/faq/comp-general.php?phpLang=en
>>>>
>>>> concerning gcc error messages that are significant for
>>>> 64-bit code compilations? In particular we need to add
>>>> a question for...
>>>>
>>>> Q6.25: I get warnings "cast to pointer from integer of different size" or
>>>> "initialization makes pointer from integer without a cast" when compiling
>>>> at -m64.
>>>>
>>>> Errors of the form "cast to pointer from integer of different size" and
>>>> "initialization makes pointer from integer without a cast" can cause latent
>>>> bugs at -m64 since, if the size of the integer is greater than the pointer,
>>>> unwanted sign extension could occur. For example...
>>>>
>>>> (unsigned long long)((void *)(0xdeadbeef)))
>>>>
>>>> could show the result as 0xffffffffdeadbeef instead of the intended
>>>> 0xdeadbeef. The fix is just to cast the pointer uintptr_t first so
>>>> that...
>>>>
>>>>   if (xim_info->current_xics == (XContext) NULL)
>>>>
>>>> becomes...
>>>>
>>>>   if (xim_info->current_xics == (XContext)(uintptr_t) NULL)
>>>>
>>>> to eliminate the incorrect cast and insure that the pointer is
>>>> correctly used.
>>>>
>>>>
> That could be done, sure.  Though that seems to me more like something
> that maintainers might have a need for than casual users, the target
> audience of the FAQ.

> Alexander,
>    I am confused as to where the main developer wiki/faq resides. I just
> want to make sure that it is the most commonly found wiki/FAQ used
> by the fink developers. Should it be added to...

> http://wiki.finkproject.org/index.php/The_Fink_Wiki

> instead?
>             Jack

This looks like it could fit well under

http://wiki.finkproject.org/index.php/Fink:Porting_Notes


- --
Alexander Hansen
Fink User Liaison
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