linux-kernel - Userspace compiler support of "long long"

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Message-ID: <20070627173240.GR1094@stusta.de>
Date:	Wed, 27 Jun 2007 19:32:40 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Joerg Schilling <Joerg.Schilling@...us.fraunhofer.de>
Cc:	mrmacman_g4@....com, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, david@...g.hm
Subject: Userspace compiler support of "long long"

On Wed, Jun 27, 2007 at 05:52:08PM +0200, Joerg Schilling wrote:
> Adrian Bunk <bunk@...sta.de> wrote:
> 
> > That's a good point I missed.
> >
> > What about:
> >
> > #if defined(__GNUC__) && __STDC_VERSION__ < 19901L
> > __extension__ typedef   signed long long __s64;
> > __extension__ typedef unsigned long long __u64;
> > #else
> > typedef   signed long long __s64;
> > typedef unsigned long long __u64;
> > #endif
> 
> What about using:
> 
> #if (defined(__GNUC__) || defined(__SUNPRO_C)) && !defined(__STRICT_ANSI__) 

AFAIR __extension__ was gcc specific.

Does the Sun cc provide options for strict C90 checking?
And if yes, what is it's syntax for disabling this checking for a line 
of code?

> Well, there seems to be one other compiler (the one from Intel).
> It may be that if this compiler does not claim to be GCC, another
> definituion needs to be added.

AFAIR the Intel compiler claims to be gcc.

But these are by far not the only C compilers under Linux, and the more 
important points are:

Is there any userspace Linux compiler that does not support "long long"?
If yes, is there any other way to tell that something is a
64bit int on 32bit architectures?

> Jörg

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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