Another problem with compiling Linux kernel

Another problem with compiling Linux kernel

[Jonathan Day]

Hi again,

Using GCC 4.0.0 on the Broadcom SB1 MIPS64 board, the
compilation crashes at the final link phase with the
following errors:

`.exit.text' referenced in section `.pdr.78' of
arch/mips/kernel/built-in.o: defined in discarded
section `.exit.text' of arch/mips/kernel/built-in.o
`.exit.text' referenced in section `.pdr.37' of
fs/built-in.o: defined in discarded section
`.exit.text' of fs/built-in.o
`.exit.text' referenced in section `.pdr.17' of
crypto/built-in.o: defined in discarded section
`.exit.text' of crypto/built-in.o
`.exit.text' referenced in section `.pdr.17' of
block/built-in.o: defined in discarded section
`.exit.text' of block/built-in.o
`.exit.text' referenced in section `.pdr.10' of
drivers/built-in.o: defined in discarded section
`.exit.text' of drivers/built-in.o
`.exit.data' referenced in section `.exit.text.403' of
net/built-in.o: defined in discarded section
`.exit.data' of net/built-in.o
`.exit.data' referenced in section `.exit.text.403' of
net/built-in.o: defined in discarded section
`.exit.data' of net/built-in.o
`.exit.data' referenced in section `.exit.text.403' of
net/built-in.o: defined in discarded section
`.exit.data' of net/built-in.o
`.exit.data' referenced in section `.exit.text.403' of
net/built-in.o: defined in discarded section
`.exit.data' of net/built-in.o
`.exit.text' referenced in section `.pdr.20' of
net/built-in.o: defined in discarded section
`.exit.text' of net/built-in.o

My first thought was "ah, might be because I'm using
an old GCC, so I'll try something more recent and see
what happens". When trying GCC 4.1.0 (snapshot from
20051017), I get the following error:

In file included from include/linux/nfs_fs.h:15,
                 from init/do_mounts.c:12:
include/linux/pagemap.h: In function
'fault_in_pages_readable':
include/linux/pagemap.h:237: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:237: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:237: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:237: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:243: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:243: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:243: error: read-only variable
'__gu_val' used as 'asm' output
include/linux/pagemap.h:243: error: read-only variable
'__gu_val' used as 'asm' output
make[1]: *** [init/do_mounts.o] Error 1
make: *** [init] Error 2

This one may be a compiler bug (experimental GCCs are,
well, experimental!) but it makes it somewhat harder
to know if the later issue is resolved by using a
different toolchain.

Any suggestions on how to fix either/both problems?

Thanks,

Jonathan Day



		
__________________________________ 
Start your day with Yahoo! - Make it your home page! 
http://www.yahoo.com/r/hs

Re: Another problem with compiling Linux kernel

[David Daney]

Jonathan Day wrote:
> Hi again,
> 
> Using GCC 4.0.0 on the Broadcom SB1 MIPS64 board, the
> compilation crashes at the final link phase with the
> following errors:
> 
.
.
> `.exit.text' referenced in section `.pdr.20' of
> net/built-in.o: defined in discarded section
> `.exit.text' of net/built-in.o
> 

I know nothing about this one.

> My first thought was "ah, might be because I'm using
> an old GCC, so I'll try something more recent and see
> what happens". When trying GCC 4.1.0 (snapshot from
> 20051017), I get the following error:
> 
> In file included from include/linux/nfs_fs.h:15,
>                  from init/do_mounts.c:12:
> include/linux/pagemap.h: In function
> 'fault_in_pages_readable':
> include/linux/pagemap.h:237: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:237: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:237: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:237: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:243: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:243: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:243: error: read-only variable
> '__gu_val' used as 'asm' output
> include/linux/pagemap.h:243: error: read-only variable
> '__gu_val' used as 'asm' output
> make[1]: *** [init/do_mounts.o] Error 1
> make: *** [init] Error 2
> 
> This one may be a compiler bug (experimental GCCs are,
> well, experimental!) but it makes it somewhat harder
> to know if the later issue is resolved by using a
> different toolchain.
> 

This is not a GCC bug, but a change in GCC behavior.  One patch was 
posted here:

http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=Pine.LNX.4.61.0511022057140.3511%40trantor.stuart.netsweng.com

I don't know if the change made it into the linux-mips git repository or 
not.

Re: Another problem with compiling Linux kernel

[Thiemo Seufer]

Jonathan Day wrote:
> Hi again,
> 
> Using GCC 4.0.0 on the Broadcom SB1 MIPS64 board,

Try 4.0.2 or 4.0.3 instead, it has some bugfixes which may help.


Thiemo

Re: Another problem with compiling Linux kernel

[Ralf Baechle]

On Tue, Nov 15, 2005 at 01:37:21PM -0800, David Daney wrote:

> >what happens". When trying GCC 4.1.0 (snapshot from
> >20051017), I get the following error:
> >
> >In file included from include/linux/nfs_fs.h:15,
> >                 from init/do_mounts.c:12:
> >include/linux/pagemap.h: In function
> >'fault_in_pages_readable':
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >make[1]: *** [init/do_mounts.o] Error 1
> >make: *** [init] Error 2
> >
> >This one may be a compiler bug (experimental GCCs are,
> >well, experimental!) but it makes it somewhat harder
> >to know if the later issue is resolved by using a
> >different toolchain.
> >
> 
> This is not a GCC bug, but a change in GCC behavior.  One patch was 
> posted here:
> 
> http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=Pine.LNX.4.61.0511022057140.3511%40trantor.stuart.netsweng.com
> 
> I don't know if the change made it into the linux-mips git repository or 
> not.

That patch has a few shortcomings, so I didn't apply it yet.  Unfortunately
a proper solution turns out to be a pretty hard nut.

  Ralf