[Buildroot] [Bug 4718] New: python (built for powerpc) distutils has paths to host compiler toolchain

[Buildroot] [Bug 4718] New: python (built for powerpc) distutils has paths to host compiler toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4718

           Summary: python (built for powerpc) distutils has paths to host
                    compiler toolchain
           Product: buildroot
           Version: 2011.11
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: bvwelch at gmail.com
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


I suspect that I probably missed somewhere that I could have set this up, and I
think I can workaround it using distutil.cfg, but I was surprised that when I
ran "python setup.py build_ext --inplace", the errors were showing path names
from the host where I ran buildroot, rather than my native powerpc toolchain.

Otherwise, buildroot is working great, thank you!

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[Buildroot] [Bug 4718] python (built for powerpc) distutils has paths to host compiler toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4718

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2012-01-31 19:43:30 UTC ---
Python support for cross-compilation is quite horrible, so the problem may be
quite hard to fix.

Could you give some steps to reproduce what you are seeing?

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[Buildroot] [Bug 4718] python (built for powerpc) distutils has paths to host compiler toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4718

--- Comment #2 from William Welch <bvwelch@gmail.com> 2012-02-01 17:23:06 UTC ---
(In reply to comment #1)
> Python support for cross-compilation is quite horrible, so the problem may be
> quite hard to fix.
> 
> Could you give some steps to reproduce what you are seeing?

First, may I say that with some more research I found a workaround that is easy
and works good.

But, here is what happens without the workaround:


python setup.py build_ext --inplace

running build_ext
building '_ncapio' extension
creating build
creating build/temp.linux-ppc-2.7

/home/bwelch/jan23a/buildroot-2011.11/output/host/usr/bin/powerpc-unknown-linux-uclibc-gcc
-fno-strict-aliasing -pipe -Os -DNDEBUG -g -fwrapv -O3 -Wall
-Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c _ncapio.c -o
build/temp.linux-ppc-2.7/_ncapio.o

unable to execute
/home/bwelch/jan23a/buildroot-2011.11/output/host/usr/bin/powerpc-unknown-linux-uclibc-gcc:
No such file or directory

error: command
'/home/bwelch/jan23a/buildroot-2011.11/output/host/usr/bin/powerpc-unknown-linux-uclibc-gcc'
failed with exit status 1

Note that instead of using my native powerpc 'gcc' and 'ld', somehow it tried
to use pathnames from my host computer's cross-toolcain??

------------------------

Now the simple workaround:

export CC='gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions'
export LDSHARED='ld -shared'

running build_ext
building '_ncapio' extension
gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -fno-strict-aliasing
-pipe -Os -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC
-I/usr/include/python2.7 -c _ncapio.c -o build/temp.linux-ppc-2.7/_ncapio.o

ld -shared build/temp.linux-ppc-2.7/_ncapio.o -L/usr/lib -lpython2.7 -o
/root/ncapio/_ncapio.so


# works fine

thank you!  buildroot, python, native gcc all working great

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[Buildroot] [Bug 4718] python (built for powerpc) distutils has paths to host compiler toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4718

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at buildroot.uclibc |gustavo at zacarias.com.ar
                   |.org                        |

--- Comment #3 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2013-05-26 10:54:21 UTC ---
Giving this bug to Gustavo, since he's been working on Python cross-compilation
issues recently.

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[Buildroot] [Bug 4718] python (built for powerpc) distutils has paths to host compiler toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4718

Gustavo Zacarias <gustavo@zacarias.com.ar> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX

--- Comment #4 from Gustavo Zacarias <gustavo@zacarias.com.ar> 2013-07-10 13:18:00 UTC ---
Target toolchain is deprecated so this bug is basically invalid/wontfix now.
Building modules in the target isn't supported nor encouraged.

*IF* you wanted to patch this for an older version of buildroot you'd need to
tweak $(TARGET_DIR)/usr/lib/python2.7/config/Makefile and substitute the
appropiate CC/CXX/AR/RANLIB/PYTHON_FOR_BUILD/PGEN_FOR_BUILD definitions to
those matching the target.

But it's completely unsupported, it may or may not work and might need
additional tweaking.

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