GNU bug report logs - #19019
Guile improperly assumes 'long' is the same size as pointers

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Date: Wed, 25 Nov 2020 11:09:05 -0800
From: Mike Gran <spk121@HIDDEN>
To: 19019 <at> debbugs.gnu.org
Subject: guile assumes long is the same size as pointers
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There appears to be a patch to fix this on guile 2.2 at
https://gitlab.com/janneke/guile/-/commit/f0fade08173b97e2b4a68b79b654ad3d30a59286

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From: Andy Wingo <wingo@HIDDEN>
To: bug#19019 <19019 <at> debbugs.gnu.org>
Subject: Re: Status: Guile improperly assumes 'long' is the same size as
 pointers
Date: Wed, 22 Jun 2016 13:34:05 +0200
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merge 19019 22406
thanks

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From: Mark H Weaver <mhw@HIDDEN>
To: bug-guile@HIDDEN
Subject: Guile improperly assumes 'long' is the same size as pointers
Date: Tue, 11 Nov 2014 11:26:41 -0500
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Forwarded from guile-user:

> Date: Mon, 10 Nov 2014 12:44:55 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> Subject: Re: Unable to compile Guile
> To: jeremy chen <yngccc@HIDDEN>
> Cc: guile-user@HIDDEN
> 
>> Date: Sun, 9 Nov 2014 23:30:07 -0500
>> From: jeremy chen <yngccc@HIDDEN>
>> 
>> Hi, I am trying to compile guile on windows with Mingw-w64.
>> The file libguile/numbers.c signal an error in this function:
>> 
>> static SCM
>> scm_i_inum2big (scm_t_inum x)
>> {
>> /* Return a newly created bignum initialized to X. */
>> SCM z = make_bignum ();
>> #if SIZEOF_VOID_P == SIZEOF_LONG
>> mpz_init_set_si (SCM_I_BIG_MPZ (z), x);
>> #else
>> /* Note that in this case, you'll also have to check all mpz_*_ui and
>> mpz_*_si invocations in Guile. */
>> #error creation of mpz not implemented for this inum size
>> #endif
>> return z;
>> }
>> 
>> sizeof(void*) is 8 and sizeof(long) is 4 on my machine.
>> Anyway to get around this? Thanks.
> 
> This is a bug in Guile: it assumes the LP64 data model, where both
> 'long' and a pointer are 64-bit wide.  But 64-bit Windows uses the
> LLP64 model, where 'long' is a 32-bit data type, and the 64-bit
> integer data type is 'long long' or '__int64'.
> 
> You need to fix Guile to support the LLP64 model, at least in this
> module, and probably elsewhere as well.