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Re: Suspicious warning in W64 build
From: |
Eli Zaretskii |
Subject: |
Re: Suspicious warning in W64 build |
Date: |
Fri, 15 Sep 2017 11:59:47 +0300 |
> From: Richard Copley <address@hidden>
> Date: Thu, 14 Sep 2017 20:34:42 +0100
> Cc: Fabrice Popineau <address@hidden>,
> Emacs Development <address@hidden>
>
> On 14 September 2017 at 18:47, Eli Zaretskii <address@hidden> wrote:
> > It was a mess, but I hope I fixed these warnings now. Please try the
> > latest master and see if any fallout remains.
>
> Not much. Here's another transcript. It's a lot better.
Some of the warnings are not Windows specific, so I'm CC'ing Paul.
CC eval.o
eval.c: In function 'internal_catch':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
struct handler *c = handlerlist->nextfree;
^
eval.c: In function 'internal_condition_case':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
eval.c: In function 'internal_condition_case_1':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
eval.c: In function 'internal_condition_case_2':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
eval.c: In function 'internal_condition_case_n':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
eval.c: In function 'internal_catch.constprop':
eval.c:1431:19: warning: variable 'c' might be clobbered by 'longjmp' or
'vfork' [-Wclobbered]
Not sure what to do about this. Add 'volatile' to the declaration of
'c'?
CC search.o
search.c: In function 'Freplace_match':
search.c:2621:15: warning: argument 1 value '2305843009213693951' exceeds
maximum object size 2147483647 [-Walloc-size-larger-than=]
substed = xmalloc (substed_alloc_size);
~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from search.c:24:0:
lisp.h:4439:14: note: in a call to allocation function 'xmalloc' declared here
extern void *xmalloc (size_t) ATTRIBUTE_MALLOC_SIZE ((1));
^~~~~~~
This seems to imply that m4/manywarnings.m4 has a bug: it somehow
deduces that a 64-bit Windows build can only allocate up to LONG_MAX
bytes. But 'long' is a 32-bit type on 64-bit MS-Windows, whereas
'size_t' is a 64-bit type, as is 'ptrdiff_t', which might be the
reason for this problem, if manywarnings.m4 somehow assumes that this
combination cannot happen.
- Re: Suspicious warning in W64 build, (continued)
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/14
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/15
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/15
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/16
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/16
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/16
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/16
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/16
- Re: Suspicious warning in W64 build, Fabrice Popineau, 2017/09/16
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/16
- Re: Suspicious warning in W64 build,
Eli Zaretskii <=
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/15
- Re: Suspicious warning in W64 build, Paul Eggert, 2017/09/17
- Re: Suspicious warning in W64 build, Richard Copley, 2017/09/17
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/17
- Re: Suspicious warning in W64 build, Paul Eggert, 2017/09/17
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/17
- Re: Suspicious warning in W64 build, Fabrice Popineau, 2017/09/17
- Re: Suspicious warning in W64 build, Eli Zaretskii, 2017/09/17
- Re: Suspicious warning in W64 build, Paul Eggert, 2017/09/17
- Re: Suspicious warning in W64 build, Fabrice Popineau, 2017/09/18