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Re: how to get typesizes w/o running binary ?

From: Ralf Corsepius <rc040203 at freenet dot de>
To: weigelt at metux dot de
Cc: crossgcc maillist <crossgcc at sources dot redhat dot com>
Date: Thu, 23 Nov 2006 07:25:08 +0100
Subject: Re: how to get typesizes w/o running binary ?
References: <20061122230513.GA24017@nibiru.local>

On Thu, 2006-11-23 at 00:05 +0100, Enrico Weigelt wrote: 
> Hi folks,
> 
> 
> I'd like to probe typesizes. 
> Simply building and running some little test program is trivial.
> But I'd like to do it *without* running an test program.
> 
> Does anyone know how I could do this ?

Depends on what you'd need this for.

- Best would be to design your app in such a way that does not depend on
precomputed sizes. Instead, let the compiler compute them at
compile-time or even at run-time.

- If your problem is fixed-size types and if you are using a modern
toolchain, base your design on C99-types (aka. stdint.h)

- If you really need pre-computed sizes, check how autoconf's
AC_CHECK_TYPE macro works or (if your work is using autoconf)
directly use it.
...

Ralf



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References:
- how to get typesizes w/o running binary ?
  - From: Enrico Weigelt

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