Hi Wilson:
	Thanks very much for the description!  Cross-compilation is one
of the things that we are intending to support at some point in the
future but we just don't have the people to dig into it with right now.
It's great to know that it can be done and having this information
available for others to work with is invaluable.

	Robert.

-----Original Message-----
From: Wilson Talaugon [mailto:community-noreply@qnx.com] 
Sent: Monday, July 28, 2008 2:25 PM
To: general-pkgsrc
Subject: Re: RE: How to cross-compile python24 for qnx-ppc using pkgsrc

Hi Robert,

I make modifications every time I encounter a build problem.
Cross-compiling python is a bit tricky.  It has 2-stage build process -
it first builds the python interpreter and then invokes the built python
binary executable to run the setup.py python script to build the
extension modules. The problem here is that the python executable is the
cross-compiled for ppc which will not run on the self-hosted machine.
You have to change the Makefile to use the python for qnx-x86.   I
haven't done the proper changes to be able to do a fresh build since my
initial goal so to be able build something that I can run.  Here's what
I did as far as I can remember:

1. You have to build & install python first natively on qnx-x86
self-hosted.  This will be installed in /usr/pkg/bin & /usr/pkg/lib.
Make sure you set your default compiler to qcc.  Add the following line
in /usr/pkg/etc/mk.conf configuration file.
PKGSRC_COMPILER=        qcc

2. Delete the previously configured & built python using "bmake clean".
3. Reconfigure python source using "bmake configure".
4. Make some changes in the Makefile to cross-compile to ppc.  You can
use the attached Makefile as a reference.  Summary of the changes:
    a. Changed the compiler to cross-compiler.  From "qcc" to "qcc
-V3.3.5,gcc_ntoppcbe".
    b. Changed the default installation directory from "/usr/pkg/src/"
to "/staging/usr/pkg/src".
    c. Changed the default python call from "./python" to "python".
This will run the native python instead of the cross-compiled python.
5. Modify python24/work/Python-2.4.4/.gcc/bin/qcc with the ff:
    exec /usr/qnx630/host/qnx6/x86/usr/bin/qcc -V3.3.5,gcc_ntoppcbe "$@"
6. Build & install python using "bmake install".
 
If anybody wants the pre-compiled binaries I can provide them in a
tarball as well.


_______________________________________________
General
http://community.qnx.com/sf/go/post11162

I know this is a very old post, could I have a binary of the python for PPC?

> Hi Robert,
> 
> I make modifications every time I encounter a build problem.  Cross-compiling 
> python is a bit tricky.  It has 2-stage build process - it first builds the 
> python interpreter and then invokes the built python binary executable to run 
> the setup.py python script to build the extension modules. The problem here is
>  that the python executable is the cross-compiled for ppc which will not run 
> on the self-hosted machine.  You have to change the Makefile to use the python
>  for qnx-x86.   I haven't done the proper changes to be able to do a fresh 
> build since my initial goal so to be able build something that I can run.  
> Here's what I did as far as I can remember:
> 
> 1. You have to build & install python first natively on qnx-x86 self-hosted.  
> This will be installed in /usr/pkg/bin & /usr/pkg/lib.  Make sure you set your
>  default compiler to qcc.  Add the following line in /
usr/pkg/etc/mk.conf 
> configuration file.
> PKGSRC_COMPILER=        qcc
> 
> 2. Delete the previously configured & built python using "bmake clean".
> 3. Reconfigure python source using "bmake configure".
> 4. Make some changes in the Makefile to cross-compile to ppc.  You can use the
>  attached Makefile as a reference.  Summary of the changes:
>     a. Changed the compiler to cross-compiler.  From "qcc" to "qcc -V3.3.5,
> gcc_ntoppcbe".
>     b. Changed the default installation directory from "/usr/pkg/src/" to "/
> staging/usr/pkg/src".
>     c. Changed the default python call from "./python" to "python".  This will
>  run the native python instead of the cross-compiled python.
> 5. Modify python24/work/Python-2.4.4/.gcc/bin/qcc with the ff:
>     exec /usr/qnx630/host/qnx6/x86/usr/bin/qcc -V3.3.5,gcc_ntoppcbe "$@"
> 6. Build & install python using "bmake install".
>  
> If anybody wants the pre-compiled binaries I can provide them in a tarball as 
> well.