Re: Building Kernels and Kernel modules

On Tue, Apr 29, 2003 at 10:06:33AM +0100, Kevin Curtis wrote:
> Hi,
> 	At last I have got a Kernel to build (2.4.21.-pre7).  Now when I try
> to build our X.25 module I get the following error:
> 
> cd ~/develop/ia64x25/src/kernel/
> make 
> gcc -m64 -Wall -Wstrict-prototypes -DMODULE -D__KERNEL__ -DLINUX -DFSK_HP2FS
> -DCONFIG_X25_MODULE -DFSC_DEBUG=0 -O2	  -I/lib/modules/`uname
> -r`/build/include -I/usr/src/linux/include -I../lib   -c -o fsx25main.o
> fsx25main.c
> In file included from
> /lib/modules/2.4.21-pre7/build/include/asm/processor.h:23,
>                  from
> /lib/modules/2.4.21-pre7/build/include/linux/prefetch.h:13,
>                  from /lib/modules/2.4.21-pre7/build/include/linux/list.h:6,
>                  from
> /lib/modules/2.4.21-pre7/build/include/linux/module.h:12,
>                  from fsx25main.c:70:
> /lib/modules/2.4.21-pre7/build/include/asm/page.h:111: global register
> variable follows a function definition
> /lib/modules/2.4.21-pre7/build/include/asm/page.h:111: warning:
> call-clobbered register used for global register variable
> make: *** [fsx25main.o] Error 1

You need to use the same kgcc (or gcc) options and the same compiler
as the kernel has been built with, particularly you should make sure all
-f* and -m* options which are used for building modules normally are on
your command line.
For kgcc, the important options include
-m64 -mno-fpu -mtune=ultrasparc -mmedlow -ffixed-g4 -fcall-used-g5 -fcall-used-g7
and for gcc
-m64 -mno-fpu -mcpu=ultrasparc -mcmodel=medlow -ffixed-g4 -fcall-used-g5 -fcall-used-g7

	Jakub