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bug#22406: Cannot compile for Windows x64 due to LLP64 model

From: Peter TB Brett
Subject: bug#22406: Cannot compile for Windows x64 due to LLP64 model
Date: Tue, 19 Jan 2016 13:50:17 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

It is not currently possible to compile Guile 2.0.11 for Windows x64 (in particular 64-bit Windows running on the x86-64 arch).

Most operating systems' C libraries for x86-64 use an "LP64" model, where sizeof(long int) == sizeof(void *) == 8.

However, for backwards-compatibility reasons, Windows uses an "LLP64" model, where sizeof(long long int) == sizeof(void *) == 8 and sizeof(long int) == 4.

Guile 2.0.11 can't cope with this; the libguile build fails due to this code:

> static SCM
> scm_i_inum2big (scm_t_inum x)
> {
>   /* Return a newly created bignum initialized to X. */
>   SCM z = make_bignum ();
>   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;
> }


Some work appears to be required before using 64-bit Guile on Windows x64 is possible.

Dr Peter Brett <address@hidden>

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