From: ludo@gnu.org (Ludovic Courtès)
To: Eli Zaretskii <eliz@gnu.org>
Cc: xdje42@gmail.com, gdb-patches@sourceware.org
Subject: Re: Building the current snapshot on Windows with Guile
Date: Thu, 12 Jun 2014 19:46:00 -0000 [thread overview]
Message-ID: <8738f9hpwv.fsf@gnu.org> (raw)
In-Reply-To: <83sinaxd5s.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 12 Jun 2014 20:15:11 +0300")
Eli Zaretskii <eliz@gnu.org> skribis:
>> From: ludo@gnu.org (Ludovic Courtès)
>> Cc: xdje42@gmail.com, gdb-patches@sourceware.org
>> Date: Thu, 12 Jun 2014 10:27:12 +0200
>>
>> > Apart of the issue with multi-ABI platforms, are there any other
>> > reasons for the *.go files to be non-portable?
>>
>> In Guile 2.0, .go files are not portable essentially because sizeof(SCM)
>> is the size of a pointer, and because numbers stored in .go files are in
>> native endianness. (Guile 2.2 uses ELF as its container format, with
>> similar issues.)
>
> Ouch! That's going to be a drag, IMO. Now I understand why there are
> no compiled *.go files in the Guile distribution (unlike with Emacs,
> for example).
>
> In that case, I guess it will be impossible to distribute precompiled
> scm files with the GDB tarball, per your suggestion. Or am I missing
> something?
I was not suggesting to distribute the .go files; rather, I was
suggesting to add makefile rules to build them and install them.
>> > E.g., if they were compiled on a 64-bit Windows 7, will they work on a
>> > 32-bit Windows XP?
>>
>> No.
>>
>> > Does the answer depend on whether the Guile executable that compiled
>> > the *.scm files was a 64-bit or a 32-bit executable?
>>
>> No.
>
> I'm puzzled: a 32-bit program still produces 32-bit code and uses
> 32-bit pointers, even when it runs on a 64-bit machine. So why the
> second "No"?
Oh you’re right, sorry for the confusion. What matters is sizeof(SCM).
>> > What about compiling on GNU/Linux and using on Windows, when the CPU
>> > is the same or from the same family?
>>
>> That works fine.
>
> Do the .go files use portable format for numbers?
Yes (info "(guile) Data Constructor Instructions").
> There's a potential issue because a 'long' on a 64-bit GNU/Linux
> system is a 64-bit quantity, while 64-bit Windows uses 32-bit 'long's.
> Could this be an issue?
Nope. The ‘make-intXX’ VM instructions are independent of the C type
definitions.
Guile supports bignums and those can be also be stored safely in
compiled files (info "(guile) Loading Instructions").
I hope this clarifies things.
Ludo’.
next prev parent reply other threads:[~2014-06-12 19:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-09 15:24 Eli Zaretskii
2014-06-09 15:39 ` Joel Brobecker
2014-06-09 17:30 ` Eli Zaretskii
2014-06-14 18:01 ` Eli Zaretskii
2014-06-09 21:04 ` Ludovic Courtès
2014-06-10 19:55 ` Doug Evans
2014-06-10 20:26 ` Eli Zaretskii
2014-06-11 12:24 ` Ludovic Courtès
2014-06-11 14:59 ` Eli Zaretskii
2014-06-12 8:27 ` Ludovic Courtès
2014-06-12 17:15 ` Eli Zaretskii
2014-06-12 19:46 ` Ludovic Courtès [this message]
2014-06-12 19:58 ` Eli Zaretskii
2014-06-13 8:35 ` Ludovic Courtès
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