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Re: Biarch patch for s390/s390x.

From: Jakub Jelinek <jakub at redhat dot com>
To: Martin Schwidefsky <schwidefsky at de dot ibm dot com>
Cc: libc-hacker at sources dot redhat dot com
Date: Tue, 9 Jul 2002 20:31:26 +0200
Subject: Re: Biarch patch for s390/s390x.
References: <200207092021.32071.schwidefsky@de.ibm.com>
Reply-to: Jakub Jelinek <jakub at redhat dot com>

On Tue, Jul 09, 2002 at 08:21:31PM +0200, Martin Schwidefsky wrote:
> Hi,
> I unified the bits and sys header files of s390-32 and s390-64. The goal is to
> be able to compile 31 bit binaries on a 64 bit system with the gcc switch -m31.
> The biarch support in the binutils already works, the compiler is almost done.
> Only the kernel header files are yet to be done.

You could use similar script like Sparc linux is using - BuildASM
is a simple script which for
/usr/include/asm-sparc and /usr/include/asm-sparc64
creates /usr/include/asm directory, which contains headers like:
#ifndef __SPARCSTUB__ASI_H__
#define __SPARCSTUB__ASI_H__
#ifdef __arch64__
#include <asm-sparc64/asi.h>
#else
#include <asm-sparc/asi.h>
#endif
#endif

(if both exist and are different, link to one of the files if they are equal
and have the corresponding #if/#else part removed if some header exists
for 32-bit or 64-bit only).

	Jakub

References:
- Biarch patch for s390/s390x.
  - From: Martin Schwidefsky

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