RE: cross compiling 32 bit Xen on an x86_64 system

[Michal Ostrowski <mostrows@watson.ibm.com>]

I came across a variant of this problem trying to cross-compile myself. 
Python's distutils.core package seem to have "gcc" hardcoded in it, and
there is no way to redirect it to another compiler when trying to build
these modules.  In other words, python seems not to be able to
cross-compile these things.

On Mon, 2005-03-21 at 23:00 +0000, Ian Pratt wrote:
> > Here is the gcc line it comes up with:
> > gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -m64 -
> > D_GNU_SOURCE -fPIC -m32 -march=i686 -fPIC -
> > I../../tools/python/xen/lowlevel/xu -I../../tools/libxc -
> > I../../tools/libxutil -I../../tools/xcs -Ixen/lowlevel/xc -
> > I/usr/include/python2.3 -c xen/lowlevel/xc/xc.c -o build/temp.linux-
> > x86_64-2.3/xen/lowlevel/xc/xc.o -fno-strict-aliasing -Wall -Werror
> > In file included from /usr/include/python2.3/Python.h:48,
> >                  from xen/lowlevel/xc/xc.c:7:
> > /usr/include/python2.3/pyport.h:554:2: #error "LONG_BIT definition
> > appears wrong for platform (bad gcc/glibc config?).
> > 
> > You will notice both "-m64" & "-m32 -march=i686" ("-m32 & -march=i686"
> > are the CFLAGS we are specifying). This is were the problem is. The
> > first set of CFLAGS with "-m64" are assumed by python.
> > 
> > On a normal x86-64 compile you get: 
> > gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -m64 -
> > D_GNU_SOURCE -fPIC -m64 -fPIC -I../../tools/python/xen/lowlevel/xu -
> > I../../tools/libxc -I../../tools/libxutil -I../../tools/xcs -
> > Ixen/lowlevel/xc -I/usr/include/python2.3 -c xen/lowlevel/xc/xc.c -o
> > build/temp.linux-x86_64-2.3/xen/lowlevel/xc/xc.o 
> > -fno-strict-aliasing -
> > Wall -Werror
> > 
> > So it's figuring out where python is getting these CFLAGS.
> 
> Interesting.
> 
> It seems to be coming from the following lines in
> /usr/lib64/python2.3/config/Makefile
> Not sure how to fix it...
> 
> # Compiler options
> OPT=            -DNDEBUG -O2 -g -pipe -m64 -D_GNU_SOURCE -fPIC
> BASECFLAGS=      -fno-strict-aliasing
> CFLAGS=         $(BASECFLAGS) $(OPT)
> 
> 
> 
> Ian

-- 
Michal Ostrowski <mostrows@watson.ibm.com>



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