Re: [Caml-list] Re: portable truncate

[Florent Monnier <monnier.florent@gmail.com>]

2013/07/27, Adrien Nader wrote:
> On Fri, Jul 26, 2013, Florent Monnier wrote:
[...]
>> I'm still not sure though that compiling with MSVC or MinGW can be
>> considered equivalent.
>> And actually they seem not considering this page:
>> [2] http://caml.inria.fr/ocaml/portability.en.html
>
> The compiler differs but otherwise the differences are small.

I have already understood that MinGW will produce a resulting binary
that equivalently makes use of MS' OS libs. But as far as I have
understood it also provide an additional layer which goal is to make
easier to compile something that comes from the Unix world. As a
result I expected to get a fully functional ocaml Unix module.


>                                                               The libc
> that is used on Windows is Microsoft's (actually called CRT); mingw*
> provide some additions to that and apparently, ftruncate is provided.

- truncate()  DOES work on my computer
- ftruncate() / _chsize()  DOESN'T


> In otherlibs/win32unix/unix.ml, you have:
>   let ftruncate fd len = invalid_arg "Unix.ftruncate not implemented"

I see,
I expected that a mingw variant would use "otherlibs/unix/"
So it seems I was wrong again on that point too.

> And in unistd.h, you have:
[...]
>   __CRT_INLINE int ftruncate(int __fd, off32_t __length)
>   {
>     return _chsize (__fd, __length);
>   }
[...]
> Considering this, you should probably make a patch to add a file
> win32unix/ftruncate.c which use the implementation above and replace the
> implementation of ftruncate* in win32unix/unix.ml.

Don't you think that "win32unix/" should remain as is for the MS
compiler, and that mingw variant should just switch to
"otherlibs/unix/" ?

> I don't know what is the purpose of the __CRT_NO_INLINE define; I've
> already asked and will propagate the answer when I get it. It would be
> good to have truncate*() too.
>
> (and submit it to the bug tracker :-) )

I do have only one test machine with Windows Seven Starter to make
tests. And I do not have the MS' compiler.

Are there other people arround living in Rennes (the town where I
live) that would accept to provide me access to other test machines
under MS/Windows ? Like for example Windows 8 ?
(So that I could do more serious tests.)

I would be interested to access Mac OS X too, also for portability works.
(Someone from the lug gave me a Mac in the past to make some
portability work, but this machine is too old now for this kind of
tasks.)

-- 
Regards