Re: 64-bit Guile on Windows

[Jean Abou Samra <jean@abou-samra.fr>]

Le 27/06/2022 à 15:56, Thomas Thiriez via General Guile related 
discussions a écrit :
> Hi,
>
> I am currently porting a macOS application to Windows, and need to 
> have libguile working.
>
> I can see GnuCash works with Guile. I could borrow their libguile.dll, 
> but it is a 32-bit build, and I am making a 64-bit application. I 
> tried building Guile 3, but had more success with Guile 2.2, so I will 
> keep that version.
>
> I have cross compiled it on my mac with mingw, and it kind of works. 
> The only thing is that if I compile my .scm files to .go, then my 
> fixnums are not automatically converted to big nums, and I get things 
> like that:
>
> (* 999 999 999) -> -76738825
>
> My fix is to keep the .scm files, and avoid compiling to .go.
>
> I believe this has something to do with the fact that, on that 
> platform, we have:
>
> sizeof(SCM)  == 8
> sizeof(long) == 4
>
> Is there something to do about that problem? Is there something I can 
> do to have a working 64-bit Guile on Windows?
>
> Thanks a lot for any help you could provide.


We had exactly the same problem at LilyPond, and this was the fix:

https://gitlab.com/lilypond/lilypond/-/blob/master/release/binaries/lib/dependencies.py#L721

Namely, you need to patch libguile/conv-integer.i.c and
conv-uinteger.i.c to replace "SIZEOF_TYPE < SIZEOF_SCM_T_BITS"
with "SIZEOF_TYPE < SIZEOF_LONG".

HTH,
Jean