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Re: Buffer size limitation in insdel.c
From: |
Lars Magne Ingebrigtsen |
Subject: |
Re: Buffer size limitation in insdel.c |
Date: |
Thu, 23 Sep 2010 15:37:35 +0200 |
User-agent: |
Gnus/5.110011 (No Gnus v0.11) Emacs/24.0.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
>> dispnew.c:783: warning: conversion to 'int' from 'Lisp_Object' may alter its
>> value
>>
>> matrix->window_left_col = WINDOW_LEFT_EDGE_COL (w);
>>
>> What's the right fix here? make window_left_col EMACS_INT, and slap an
>> XINT around the WINDOW_LEFT_EDGE_COL?
>
> I don't see this warning with "gcc (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu4)".
This is with "gcc (Debian 4.4.4-7) 4.4.4". When I was Googling for
-Wconversion, I found somebody saying that it's a switch that has
existed for a long time, but it was recently given a total makeover, and
was made to be more useful.
> And I don't see how you could possibly get it, since
> window_left_edge_col is an int, whereas WINDOW_LEFT_EDGE_COL is
> defined like this:
>
> #define WINDOW_LEFT_EDGE_COL(W) \
> (XFASTINT ((W)->left_col))
>
> So it already extracts the integer from a Lisp_Object. What am I
> missing?
Hm. What version of XFASTINT is being used by default? If it's this
one, I can perhaps understand the warning. I think.
#define XFASTINT(a) ((a) + 0)
So gcc 4.4.4 doesn't understand that this converts from Lisp_Object a to
EMACS_INT a? Which is what I'm assuming it's doing, although I'm not
sure whether the C standard actually allows doing it this way?
--
(domestic pets only, the antidote for overdose, milk.)
address@hidden * Lars Magne Ingebrigtsen
- Re: Buffer size limitation in insdel.c, (continued)
- Re: Buffer size limitation in insdel.c, Richard Stallman, 2010/09/22
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Andreas Schwab, 2010/09/23
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c,
Lars Magne Ingebrigtsen <=
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Lars Magne Ingebrigtsen, 2010/09/23
- Re: Buffer size limitation in insdel.c, Eli Zaretskii, 2010/09/23
- Re: Buffer size limitation in insdel.c, Richard Stallman, 2010/09/24