Re: [AD] Fwd: Re: Allegro + latest MinGW = off_t undefined

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4GB is not very large in general - I could easily see a game's data pack be larger than that. Also videos are often more than 4GB. But chances are when compiling for 32-bit there could be some other limit so you would not be able to work with such sizes anyway - however I just don't understand why the Allegro API does have to expose that with a weird type like off_t which changes size depending on the platform. Maybe I'll do a sed -i -e 's/off_t/int64_t/g' and create a pull request if nobody disagrees - but I don't know the original reason for off_t so maybe there is a good reason for it.

On Mon, Oct 17, 2016 at 6:37 PM, Edgar Reynaldo <edgarreynaldo@xxxxxxxxxx> wrote:

Meant to send this to the mailing list. Sorry bout that.

-------- Forwarded Message --------
Subject: Re: [AD] Allegro + latest MinGW = off_t undefined
Date: Mon, 17 Oct 2016 17:32:25 -0500
From: Edgar Reynaldo <>
To: Elias Pschernig <elias@xxxxxxxxxxxx>

On 10/9/2016 10:01 AM, Elias Pschernig wrote:
Or maybe replace off_t with int64_t - the uses I can see seem very suspicious, and most likely currently Allegro 5 will break if it is ever compiled on a system where off_t is only 32 bit.

On Sat, Oct 8, 2016 at 9:59 PM, SiegeLord <siegelordex@xxxxxxxxxx> wrote:
Sounds like the proper solution is to define _POSIX_C_SOURCE then, perhaps guarded by a check for ALLEGRO_GCC.

All of these errors have been fixed by patches issued by Keith Marshall of MinGW, as detailed here :

So as far as I can see, Allegro 5 programs now properly compile with the C++11 standard in use.

Do we really need to replace off_t with int64_t though? I mean better safe than sorry, but are we really ever going to deal with file system entries larger than 4GB? Where does the issue with using off_t on 64 bit systems come in? If we needed file system offsets I would agree that int64_t would be better, but I don't see any of that in use at the moment.


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