RE: [Caml-list] Trying to setup mingw OCaml 3.12.1 + fresh cygwin

[David Allsopp <dra-news@metastack.com>]

Adrien Nader wrote:
> On 10/08/2011, Matthieu Dubuget <matthieu.dubuget@gmail.com> wrote:
> >
> > Date: 10/08/2011 10:25
> > From: David Allsopp <dra-news@metastack.com> wrote:
> >> Good to know that 64-bit MinGW is working - that said, I thought the
> >> MinGW port was broken in 3.12.1 or is that not affected with the
> >> 64-bit compiler? Could you share details on how you configured OCaml?
> >
> > This is not 64 bits. i686-w64-mingw32 is 32 bits. But for this, I
> > adapted some patches borrowed from bug #5179, that may interest you.
 
<snip>

> By the way, ocaml's configure scripts have at least one problem:
> windows uses the LLP64 model while linux and many others use the LP64
> model [1]. The endianess test uses a variable of type long and assumes it
> is the same size as a pointer which is not the case on windows 64.
> On C99, you can use (u)intptr_t and types from stddef.h (size_t,
> ptrdiff_t, ...) instead. These types can also be used with GCC and
> probably others even when in non-C99 mode.
> 
> [1] http://en.wikipedia.org/wiki/LLP64#Specific_C-language_data_models
> 
> If I remember correctly, you're still supposed to use the Makefile.nt
> (make -f Makefile.nt) files with minor changes instead of calling
> configure when using mingw and you're outside of cygwin which means the
> issue won't always pop up but it's quite important to have this in mind
> when porting to windows 64 (it's a common issue).

That's correct - on Windows, you only run configure if you're targeting native Cygwin. There are alternate Makefiles in config/ and you edit and rename the one you need for the other ports.


David