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SubjectRe: error: 'SEGMENT_SIZE' undeclared with arm-eabi-gcc toolchain
On Fri, 30 Mar 2012, Kukjin Kim wrote:

> 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?

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


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