[gentoo-user] 32bit-Executables on a AMD64 system...

[gentoo-user] 32bit-Executables on a AMD64 system...

[meino.cramer]

Hi,

it is possible to run a 32-bit binary executable on a 64-bit system
(AMD64).


But: Is it possible to compile source code on a 64-bit system and get
an 32-bit executable a the result ??? And if 'yes'...how???

Thank you very much for any help in advance!

Best regards,
mcc

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Jarry]

On 9. 11. 2010 18:25, meino.cramer@gmx.de wrote:

> But: Is it possible to compile source code on a 64-bit system and get
> an 32-bit executable a the result ??? And if 'yes'...how???

I think that is what "cross-compilation" is good for...

Jarry

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Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Maciej Grela]

2010/11/9  <meino.cramer@gmx.de>:
> Hi,
>
> it is possible to run a 32-bit binary executable on a 64-bit system
> (AMD64).
>
>
> But: Is it possible to compile source code on a 64-bit system and get
> an 32-bit executable a the result ??? And if 'yes'...how???
>

grela@kraken ~ $ cat test.c
void main() {}
grela@kraken ~ $ gcc -o a.out.64 test.c
grela@kraken ~ $ gcc -m32 -o a.out.32 test.c
grela@kraken ~ $ file a.out.*
a.out.32: ELF 32-bit LSB executable, Intel 80386, version 1
(GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux
2.6.9, not stripped
a.out.64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux),
dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not
stripped
grela@kraken ~ $

Br,
Maciej Grela

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[meino.cramer]

Jarry <mr.jarry@gmail.com> [10-11-09 18:36]:
> On 9. 11. 2010 18:25, meino.cramer@gmx.de wrote:
> 
> >But: Is it possible to compile source code on a 64-bit system and get
> >an 32-bit executable a the result ??? And if 'yes'...how???
> 
> I think that is what "cross-compilation" is good for...
> 
> Jarry
> 
> -- 
> _______________________________________________________________
> This mailbox accepts e-mails only from selected mailing-lists!
> Everything else is considered to be spam and therefore deleted.
> 

Is there a toolchain already setup for cross-compiling 32-bit
executables on a AMD64 system, or do I have to do all that cross-
compiling magic by myself ?

Best regards,
mcc

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[meino.cramer]

Maciej Grela <maciej.grela@gmail.com> [10-11-09 18:40]:
> 2010/11/9  <meino.cramer@gmx.de>:
> > Hi,
> >
> > it is possible to run a 32-bit binary executable on a 64-bit system
> > (AMD64).
> >
> >
> > But: Is it possible to compile source code on a 64-bit system and get
> > an 32-bit executable a the result ??? And if 'yes'...how???
> >
> 
> grela@kraken ~ $ cat test.c
> void main() {}
> grela@kraken ~ $ gcc -o a.out.64 test.c
> grela@kraken ~ $ gcc -m32 -o a.out.32 test.c
> grela@kraken ~ $ file a.out.*
> a.out.32: ELF 32-bit LSB executable, Intel 80386, version 1
> (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux
> 2.6.9, not stripped
> a.out.64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux),
> dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not
> stripped
> grela@kraken ~ $
> 
> Br,
> Maciej Grela
> 

Oh YEAH! That's a definition of "straight forward I do like very much!
Thanks a lot, Maciej! You saved me a lot of half defunct bits ! ;)

Best regards,
mcc

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[meino.cramer]

Maciej Grela <maciej.grela@gmail.com> [10-11-09 18:40]:
> 2010/11/9  <meino.cramer@gmx.de>:
> > Hi,
> >
> > it is possible to run a 32-bit binary executable on a 64-bit system
> > (AMD64).
> >
> >
> > But: Is it possible to compile source code on a 64-bit system and get
> > an 32-bit executable a the result ??? And if 'yes'...how???
> >
> 
> grela@kraken ~ $ cat test.c
> void main() {}
> grela@kraken ~ $ gcc -o a.out.64 test.c
> grela@kraken ~ $ gcc -m32 -o a.out.32 test.c
> grela@kraken ~ $ file a.out.*
> a.out.32: ELF 32-bit LSB executable, Intel 80386, version 1
> (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux
> 2.6.9, not stripped
> a.out.64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux),
> dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not
> stripped
> grela@kraken ~ $
> 
> Br,
> Maciej Grela
> 

Sorry a little offtopic, but: There is kinda nonsense-humor of 
gcc in you lines. To call a program, which only consists of "void main() {}",
to be "non stripped" is - at least - "british understatement" (no
punt intended!) :) ;) X-}

Best regards,
mcc

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Jacob Todd]

[-- Attachment #1: Type: text/plain, Size: 783 bytes --]

Crosstools
On Nov 9, 2010 12:39 PM, <meino.cramer@gmx.de> wrote:
> Jarry <mr.jarry@gmail.com> [10-11-09 18:36]:
>> On 9. 11. 2010 18:25, meino.cramer@gmx.de wrote:
>>
>> >But: Is it possible to compile source code on a 64-bit system and get
>> >an 32-bit executable a the result ??? And if 'yes'...how???
>>
>> I think that is what "cross-compilation" is good for...
>>
>> Jarry
>>
>> --
>> _______________________________________________________________
>> This mailbox accepts e-mails only from selected mailing-lists!
>> Everything else is considered to be spam and therefore deleted.
>>
>
> Is there a toolchain already setup for cross-compiling 32-bit
> executables on a AMD64 system, or do I have to do all that cross-
> compiling magic by myself ?
>
> Best regards,
> mcc
>
>

[-- Attachment #2: Type: text/html, Size: 1209 bytes --]

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Coert Waagmeester]

meino.cramer@gmx.de wrote:
> Hi,
> 
> it is possible to run a 32-bit binary executable on a 64-bit system
> (AMD64).
> 
> 
> But: Is it possible to compile source code on a 64-bit system and get
> an 32-bit executable a the result ??? And if 'yes'...how???
> 
> Thank you very much for any help in advance!
> 
> Best regards,
> mcc
> 
> 
> 

Hello Meino,

My setup is one 32bit pc with gentoo and another 64bit pc with gentoo

I managed to get this going on the 64bit with a 32-bit chroot, distcc, 
and crosstools

Just make sure you compiled your kernel with IA32 binary support (should 
be default)

Here are some links:
http://www.gentoo.org/proj/en/base/amd64/howtos/index.xml?part=1&chap=2
http://www.gentoo.org/doc/en/cross-compiling-distcc.xml
http://www.gentoo.org/doc/en/distcc.xml
http://www.gentoo.org/proj/en/base/embedded/handbook/index.xml?part=1&chap=2

Regards,
Coert Waagmeester

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[meino.cramer]

Coert Waagmeester <lgroups@waagmeester.co.za> [10-11-10 18:40]:
> meino.cramer@gmx.de wrote:
> >Hi,
> >it is possible to run a 32-bit binary executable on a 64-bit system
> >(AMD64).
> >But: Is it possible to compile source code on a 64-bit system and get
> >an 32-bit executable a the result ??? And if 'yes'...how???
> >Thank you very much for any help in advance!
> >Best regards,
> >mcc
> 
> Hello Meino,
> 
> My setup is one 32bit pc with gentoo and another 64bit pc with gentoo
> 
> I managed to get this going on the 64bit with a 32-bit chroot, distcc, 
> and crosstools
> 
> Just make sure you compiled your kernel with IA32 binary support 
> (should be default)
> 
> Here are some links:
> http://www.gentoo.org/proj/en/base/amd64/howtos/index.xml?part=1&chap=2
> http://www.gentoo.org/doc/en/cross-compiling-distcc.xml
> http://www.gentoo.org/doc/en/distcc.xml
> http://www.gentoo.org/proj/en/base/embedded/handbook/index.xml?part=1&chap=2
> 
> Regards,
> Coert Waagmeester
> 

Hi Coert,

thanks a lot for your informations and the links! :)

I will see, how I will proceed...

Best regards
mcc

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Enrico Weigelt]

* meino.cramer@gmx.de <meino.cramer@gmx.de> wrote:

> Is there a toolchain already setup for cross-compiling 32-bit
> executables on a AMD64 system, or do I have to do all that cross-
> compiling magic by myself ?

crosstool-ng

If you want a build system for crosscompiling, you might like
to look at Briegel.


cu
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Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Enrico Weigelt]

* meino.cramer@gmx.de <meino.cramer@gmx.de> wrote:

> > grela@kraken ~ $ gcc -o a.out.64 test.c
> > grela@kraken ~ $ gcc -m32 -o a.out.32 test.c
> > grela@kraken ~ $ file a.out.*
> > a.out.32: ELF 32-bit LSB executable, Intel 80386, version 1
> > (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux
> > 2.6.9, not stripped
> > a.out.64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux),
> > dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not
> > stripped
> > grela@kraken ~ $
> > 
> > Br,
> > Maciej Grela
> > 
> 
> Oh YEAH! That's a definition of "straight forward I do like very much!
> Thanks a lot, Maciej! You saved me a lot of half defunct bits ! ;)

Only for the specific case that your target system has the same
system libraries (and you have a *full* multilib installation)
as the building system.

If you want to crosscompile, you *most likely* want sysroot too.


cu
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 phone:  +49 36207 519931  email: weigelt@metux.de
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Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Enrico Weigelt]

* Coert Waagmeester <lgroups@waagmeester.co.za> wrote:

> My setup is one 32bit pc with gentoo and another 64bit pc with gentoo
> 
> I managed to get this going on the 64bit with a 32-bit chroot, distcc, 
> and crosstools

Why do you need an 32bit chroot if you're going to use an
crosscompiler anyways ?

> Just make sure you compiled your kernel with IA32 binary support (should 
> be default)

The _target_ kernel has to support the IA32 ABI. The host (building)
might be better off w/o it (better detection of build errors).


cu
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 phone:  +49 36207 519931  email: weigelt@metux.de
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Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Coert Waagmeester]

Enrico Weigelt wrote:
> * Coert Waagmeester <lgroups@waagmeester.co.za> wrote:
> 
>> My setup is one 32bit pc with gentoo and another 64bit pc with gentoo
>>
>> I managed to get this going on the 64bit with a 32-bit chroot, distcc, 
>> and crosstools
> 
> Why do you need an 32bit chroot if you're going to use an
> crosscompiler anyways ?
> 
You are right, I only have distcc in the 32bit chroot, it ofcourse 
already has the 32bit gcc et al.

I have a 64bit crossdev setup on my 32 bit machine. that is where the 
confusion came in.
>> Just make sure you compiled your kernel with IA32 binary support (should 
>> be default)
> 
> The _target_ kernel has to support the IA32 ABI. The host (building)
> might be better off w/o it (better detection of build errors).
How would this work exactly?
64 bit only installation with a 32 bit crossdev installation?
> 
> 
> cu

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Volker Armin Hemmann]

On Tuesday 09 November 2010, meino.cramer@gmx.de wrote:
> Hi,
> 
> it is possible to run a 32-bit binary executable on a 64-bit system
> (AMD64).

yes, if you use the multilib profile.



> But: Is it possible to compile source code on a 64-bit system and get
> an 32-bit executable a the result ??? And if 'yes'...how???

cross compiling

Re: [gentoo-user] 32bit-Executables on a AMD64 system...

[Enrico Weigelt]

* Coert Waagmeester <lgroups@waagmeester.co.za> wrote:
> >The _target_ kernel has to support the IA32 ABI. The host (building)
> >might be better off w/o it (better detection of build errors).
>
> How would this work exactly?
> 64 bit only installation with a 32 bit crossdev installation?

Not sure on how gentoo builds the crosscompilers, but with an
crosstool-ng generated toolchain it will do.


cu
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