From: "Jan Djärv" <jan.h.d@swipnet.se>
To: Bruno Haible <bruno@clisp.org>
Cc: 9025@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>,
bug-gnulib@gnu.org
Subject: bug#9025: 24.0.50; gnulib defines intmax_t to int64_t on OSX, causes warnings and confusion.
Date: Sat, 09 Jul 2011 13:25:54 +0200 [thread overview]
Message-ID: <4E183AC2.2010103__44902.0960405052$1310210848$gmane$org@swipnet.se> (raw)
In-Reply-To: <201107091227.03099.bruno@clisp.org>
Bruno Haible skrev 2011-07-09 12.27:
> Jan Djärv writes:
>
>>> Somewhere in gnulib, intmax_t gets defined to int64_t thus causing
>>> compiler warnings and general confusion (the code says intmax_t but is
>>> really int64_t). AFAIK, all versions of OSX have intmax_t.
>
> Please provide a reproducible test case, preferrably outside Emacs.
Outside Emacs is hard, since I don't know what code uses gnulib or how to use
it standalone.
>
> Also, I don't understand what's the problem: intmax_t must be 64-bit on
> MacOS X. No compiler supports 128-bit integers, AFAIK. Can you explain?
>
See reply to Paul.
Basically intmax_t is long and int64_t is long long. Same size though.
For example:
intmax_t x;
...
printf ("%jd", x);
gives a compiler warning:
warning: format ‘%jd’ expects type ‘intmax_t’, but argument 2 has type ‘int64_t’
The naive fix is to cast x:
printf ("%jd", (intmax_t)x);
but that don't work because intmax_t is a define to int64_t.
Jan D.
> Paul Eggert wrote:
>> Which compiler and OS version are you using?
>>
>> Does the following (untested) patch to lib/stdint.in.h fix your problem?
>>
>> diff --git a/lib/stdint.in.h b/lib/stdint.in.h
>> index c44401f..0dd60b9 100644
>> --- a/lib/stdint.in.h
>> +++ b/lib/stdint.in.h
>> @@ -270,6 +270,11 @@ typedef unsigned long int gl_uintptr_t;
>> /* Note: These types are compiler dependent. It may be unwise to use them in
>> public header files. */
>>
>> +/* If the system defines INTMAX_MAX, assume that intmax_t works, and
>> + similarly for UINTMAX_MAX and uintmax_t. This avoids problems with
>> + assuming one type where another is used by the system. */
>> +
>> +#ifndef INTMAX_MAX
>> #undef intmax_t
>> #if @HAVE_LONG_LONG_INT@&& LONG_MAX>> 30 == 1
>> typedef long long int gl_intmax_t;
>> @@ -280,7 +285,9 @@ typedef long long int gl_intmax_t;
>> typedef long int gl_intmax_t;
>> # define intmax_t gl_intmax_t
>> #endif
>> +#endif
>
> Untested patches are OK in simple areas. But in complex areas like stdint.in.h
> I would really like to understand the problem before applying any patch. That
> means, provide a reproducible sample (including all details about OS, compiler,
> compiler options), and show the preprocessing result (output of "$CC -E" or
> - even better - "$CC -E -dD") of the code that gives warnings.
>
> Bruno
next prev parent reply other threads:[~2011-07-09 11:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4E1826ED.9020602@cs.ucla.edu>
2011-07-09 10:27 ` bug#9025: 24.0.50; gnulib defines intmax_t to int64_t on OSX, causes warnings and confusion Bruno Haible
2011-07-09 11:18 ` Jan Djärv
[not found] ` <201107091227.03099.bruno@clisp.org>
2011-07-09 11:25 ` Jan Djärv [this message]
2011-07-09 22:06 ` Paul Eggert
2011-07-08 10:17 Jan Djärv
2011-07-09 10:01 ` Paul Eggert
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