how to cross compile kexec for 64b x86_64 on a 32b x86

how to cross compile kexec for 64b x86_64 on a 32b x86

[Srinivas Murthy]

Hi,
	I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
platform on a 32b x86.

	I didn't see any instructions in the configure, etc. scripts for doing this.

	Can you please let me know how to do this?

Thanks.

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Bernhard Walle]

* "Srinivas Murthy" <codevana@gmail.com> [2008-06-24 11:11]:
>
> Hi,
> 	I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
> platform on a 32b x86.
> 
> 	I didn't see any instructions in the configure, etc. scripts for doing this.

gcc does not support that (like the -m32 flag when you build i386 on
x86-64). You need to build a cross compiler, and then you would pass
that via

      CC=your-cross-compiler ./configure



Bernhard
-- 
Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Srinivas Dharmasanam]

Tried that; it fails saying:

checking for gcc...
/gcc-3.4.5-glibc-2.3.6/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... configure: error: cannot run
C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.


configure:1803:
/gcc-3.4.5-glibc-2.3.6/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-gcc
   conftest.c  >&5
configure:1806: $? = 0
configure:1852: result: a.out
configure:1857: checking whether the C compiler works
configure:1863: ./a.out
./configure: ./a.out: No such file or directory
configure:1866: $? = 127
configure:1875: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.

I dont see a conftest.c file anywhere.



On Tue, Jun 24, 2008 at 11:14 AM, Bernhard Walle <bwalle@suse.de> wrote:
> * "Srinivas Murthy" <codevana@gmail.com> [2008-06-24 11:11]:
>>
>> Hi,
>>       I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
>> platform on a 32b x86.
>>
>>       I didn't see any instructions in the configure, etc. scripts for doing this.
>
> gcc does not support that (like the -m32 flag when you build i386 on
> x86-64). You need to build a cross compiler, and then you would pass
> that via
>
>      CC=your-cross-compiler ./configure
>
>
>
> Bernhard
> --
> Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development
>

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Bernhard Walle]

* "Srinivas Dharmasanam" <the.srinivas@gmail.com> [2008-06-24 11:46]:
>
> Tried that; it fails saying:
> 
> checking for gcc...
> /gcc-3.4.5-glibc-2.3.6/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-gcc
> checking for C compiler default output file name... a.out
> checking whether the C compiler works... configure: error: cannot run
> C compiled programs.
> If you meant to cross compile, use `--host'.
> See `config.log' for more details.

Ah, right, try

  ./configure \
      --host=x86_64-unknown-linux-gnu
      --build=x86_64-unknown-linux-gnu

> I dont see a conftest.c file anywhere.

Read config.log. It's "inline", the conftest.c gets deleted on very
check.


Bernhard
-- 
Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Neil Horman]

On Tue, Jun 24, 2008 at 11:11:36AM -0700, Srinivas Murthy wrote:
> Hi,
> 	I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
> platform on a 32b x86.
> 
> 	I didn't see any instructions in the configure, etc. scripts for doing this.
> 
> 	Can you please let me know how to do this?
> 
Mostly, you can get away with adding -m32 to the top level CFLAGS in the
makefile and running setarch i386 in the shell where you run make

Neil

> Thanks.
> 
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> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec

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/***************************************************
 *Neil Horman
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 *Red Hat, Inc.
 *nhorman@redhat.com
 *gpg keyid: 1024D / 0x92A74FA1
 *http://pgp.mit.edu
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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Bernhard Walle]

* Neil Horman <nhorman@redhat.com> [2008-06-24 14:52]:
> On Tue, Jun 24, 2008 at 11:11:36AM -0700, Srinivas Murthy wrote:
> > Hi,
> > 	I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
> > platform on a 32b x86.
> > 
> > 	I didn't see any instructions in the configure, etc. scripts for doing this.
> > 
> > 	Can you please let me know how to do this?
> > 
> Mostly, you can get away with adding -m32 to the top level CFLAGS in the
> makefile and running setarch i386 in the shell where you run make

It's the other way round. Not i386 on x86-64, but x86-64 on i386.

(BTW: 'setarch' does not exist on SUSE, we use 'linux32'. I don't have
an overview about other Linux distributions. Unfortunately, that seems
to be not standardised via LSB.)



Bernhard
-- 
Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Neil Horman]

On Tue, Jun 24, 2008 at 08:55:08PM +0200, Bernhard Walle wrote:
> * Neil Horman <nhorman@redhat.com> [2008-06-24 14:52]:
> > On Tue, Jun 24, 2008 at 11:11:36AM -0700, Srinivas Murthy wrote:
> > > Hi,
> > > 	I need to cross-compile kexec-tools-1.101 for a x86_64 architecture
> > > platform on a 32b x86.
> > > 
> > > 	I didn't see any instructions in the configure, etc. scripts for doing this.
> > > 
> > > 	Can you please let me know how to do this?
> > > 
> > Mostly, you can get away with adding -m32 to the top level CFLAGS in the
> > makefile and running setarch i386 in the shell where you run make
> 
> It's the other way round. Not i386 on x86-64, but x86-64 on i386.
> 
ah, my bad. yes, for 64 bit on a 32 bit arch, you'll certainly need a cross-cc.

Neil

-- 
/***************************************************
 *Neil Horman
 *Software Engineer
 *Red Hat, Inc.
 *nhorman@redhat.com
 *gpg keyid: 1024D / 0x92A74FA1
 *http://pgp.mit.edu
 ***************************************************/

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Srinivas Murthy]

./configure \
     --host=x86_64-unknown-linux-gnu
seems to work. The --build is if we're building on the x86_64.

It seems that I now need the crash utility also to be cross compiled.
I dont see any cross-compile support in the crash-4.0-6.3 pkg.

Any suggestions for how to cross compile the crash-4.0-6.3 for x86_64
on an x86 system.

Thanks.

On Tue, Jun 24, 2008 at 11:50 AM, Bernhard Walle <bwalle@suse.de> wrote:
> * "Srinivas Dharmasanam" <the.srinivas@gmail.com> [2008-06-24 11:46]:
>>
>> Tried that; it fails saying:
>>
>> checking for gcc...
>> /gcc-3.4.5-glibc-2.3.6/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-gcc
>> checking for C compiler default output file name... a.out
>> checking whether the C compiler works... configure: error: cannot run
>> C compiled programs.
>> If you meant to cross compile, use `--host'.
>> See `config.log' for more details.
>
> Ah, right, try
>
>  ./configure \
>      --host=x86_64-unknown-linux-gnu
>      --build=x86_64-unknown-linux-gnu
>
>> I dont see a conftest.c file anywhere.
>
> Read config.log. It's "inline", the conftest.c gets deleted on very
> check.
>
>
> Bernhard
> --
> Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development
>

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Bernhard Walle]

* "Srinivas Murthy" <codevana@gmail.com> [2008-06-24 16:48]:
>
> Any suggestions for how to cross compile the crash-4.0-6.3 for x86_64
> on an x86 system.

Tweak the Makefile. Or ask Dave on the crash list
(https://www.redhat.com/mailman/listinfo/crash-utility).



Bernhard
-- 
Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development

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Re: how to cross compile kexec for 64b x86_64 on a 32b x86

[Dave Anderson]

> It seems that I now need the crash utility also to be cross compiled.
> I dont see any cross-compile support in the crash-4.0-6.3 pkg.

You got that right...

> Any suggestions for how to cross compile the crash-4.0-6.3 for x86_64
> on an x86 system.

Like Bernhard suggested, try tinkering with the compilations in the
top-level Makefile, as well as passing --host and --target arguments
to the embedded gdb's configure command when it gets built.

I'm unaware of anybody who's ever attempted it...

Dave




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