error: 'SEGMENT_SIZE' undeclared with arm-eabi-gcc toolchain

Hi all,

Occurs following error with arm-eabi-gcc toolchain (gcc version 4.4.3 - GCC). But there is no error with arm-none-linux-gnueabi-gcc toolchain (gcc version 4.4.1 - Sourcery G++ Lite 2009q3)...

fs/binfmt_aout.c: In function 'load_aout_binary':
fs/binfmt_aout.c:255: error: 'SEGMENT_SIZE' undeclared (first use in this function)
fs/binfmt_aout.c:255: error: (Each undeclared identifier is reported only once
fs/binfmt_aout.c:255: error: for each function it appears in.) make[2]: *** [fs/binfmt_aout.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [fs] Error 2

Any idea?

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <[email protected]>, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd.

Yes. This comes from the N_DATADDR() macro, defined in include/linux/a.out.h as follows:

|#define N_DATADDR(x) \
|    (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
|     : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))

Then, looking at _N_SEGMENT_ROUND() in the same file:

|#define _N_SEGMENT_ROUND(x) ALIGN(x, SEGMENT_SIZE)

Here it is. Now, why isn't SEGMENT_SIZE defined? Well that's where things get way more hairy than they are already (caution, barf bag recommended):

|/* Address of data segment in memory after it is loaded.
|   Note that it is up to you to define SEGMENT_SIZE
|   on machines not listed here.  */
|#if defined(vax) || defined(hp300) || defined(pyr)
|#define SEGMENT_SIZE page_size
|#endif
|#ifdef	sony
|#define	SEGMENT_SIZE	0x2000
|#endif	/* Sony.  */
|#ifdef is68k
|#define SEGMENT_SIZE 0x20000
|#endif
|#if defined(m68k) && defined(PORTAR)
|#define PAGE_SIZE 0x400
|#define SEGMENT_SIZE PAGE_SIZE
|#endif
|
|#ifdef linux
|#ifdef __KERNEL__
|#include <asm/page.h>
|#else
|#include <unistd.h>
|#endif
|#if defined(__i386__) || defined(__mc68000__)
|#define SEGMENT_SIZE	1024
|#else
|#ifndef SEGMENT_SIZE
|#ifdef __KERNEL__
|#define SEGMENT_SIZE	PAGE_SIZE
|#else
|#define SEGMENT_SIZE   getpagesize()
|#endif
|#endif
|#endif
|#endif

So the clue you're looking for is probably on the 18th line above.

BTW, no one is using a.out on ARM anymore. You should really consider removing CONFIG_BINFMT_AOUT from your config.

Nicolas

[...]

Hi Nicolas,

Ah Yep, I see.

Oh, now s3c2410_defconfig has it. OK, let me fix it.

Thank you for your time and kindly explanation.

Best regards,
Kgene.
--
Kukjin Kim <[email protected]>, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd.