[Bf-committers] compiling 32 bit blender on 64 bit linux

[Alfredo de Greef]

Hi everyone,

Up to a month ago I compiled Blender without any
apparent problems on 64 bit linux, without any
modification. However, now having to work again on the
yafray code, I'm experiencing problems. For some
reason, pre-242 (cvs) blendfiles load incorrectly,
specifically, the RenderData struct seems to contain
incorrect, or at least 'shifted' values. What I mean
with 'shifted' is that parameters do have the correct
values, but from *other* parameters, values are not
assigned to the correct parameter.
Anyway, I don't know why everything worked before,
something apparently recently changed, but this might
have something to do with Blender's known 64 bit
problems.
So I would like to know how to compile a 32 bit
version of Blender on 64 bit Linux. I use SuSe 10.0,
with gcc 4.0.2 and scons. I'm no expert when it comes
to these things, I can only guess what I'm supposed to
do. I have tried adding the '-m32' flag to
CFLAGS/CCFLAGS & CXXFLAGS in the user-config.py file,
but apparently this is not enough, it seems to work
fine until 'makesdna.c', at which point it stops:

/usr/lib64/gcc/x86_64-suse-linux/4.0.2/../../../../x86_64-suse-linux/bin/ld:
warning: i386 architecture of input file
`/home/eeshlo/cpp_source/blender_310506/build/linux2/source/blender/makesdna/intern/makesdna.o'
is incompatible with i386:x86-64 output
/usr/lib64/gcc/x86_64-suse-linux/4.0.2/../../../../x86_64-suse-linux/bin/ld:
warning: i386 architecture of input file
`intern/guardedalloc/intern/mallocn.o' is incompatible
with i386:x86-64 output
../build/linux2/makesdna
/home/eeshlo/cpp_source/blender_310506/build/linux2/source/blender/makesdna/intern/dna.c
scons: ***
[/home/eeshlo/cpp_source/blender_310506/build/linux2/source/blender/makesdna/intern/dna.c]
Error -11
scons: building terminated because of errors.

I have tried several random things, at one point I got
past this point, but then either makesdna segfaults or
the linking stage is still trying to link with the 64
bit libraries. But can't remember how I accomplished
either.

Searching for info on the net, I found similar stories
of problems on compiling 32 bit programs on 64 bit
linux (for the SuSe distro at least), sometimes
without a solution, so maybe this is not something
unusual.
So my question is, can anyone give me a step by step
description of the required changes to get a 32 bit
version of Blender? I'm willing to try the makefile
system as well.

Thanks in advance!

Alfredo


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