[Pythonmac-SIG] python 2.6 on mac seems to break compatibility

[Rodrigo Ventura]

I'm having difficulty on compiling PIL on Leopard. PIL used to compile  
just fine with the system's python (2.5.1 I believe), but with  
macpython 2.6 it breaks.

First of all, I get lots of warnings after almost all gcc calls during  
compilation that I did't get before. Sample example:


gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk - 
fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 - 
DHAVE_LIBJPEG -DHAVE_LIBZ -I/System/Library/Frameworks/Tcl.framework/ 
Headers -I/System/Library/Frameworks/Tk.framework/Headers -I/opt/local/ 
include/freetype2 -IlibImaging -I/opt/local/include -I/Library/ 
Frameworks/Python.framework/Versions/2.6/include -I/usr/include -I/ 
Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c  
libImaging/RawDecode.c -o build/temp.macosx-10.3-i386-2.6/libImaging/ 
RawDecode.o
In file included from /usr/include/math.h:26,
                 from /Library/Frameworks/Python.framework/Versions/ 
2.6/include/python2.6/pyport.h:235,
                 from /Library/Frameworks/Python.framework/Versions/ 
2.6/include/python2.6/Python.h:58,
                 from libImaging/ImPlatform.h:10,
                 from libImaging/Imaging.h:14,
                 from libImaging/RawDecode.c:17:
/usr/include/architecture/ppc/math.h:675: warning: conflicting types  
for built-in function 'scalb'


Another illustrative example:


gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk - 
fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -I/System/ 
Library/Frameworks/Tcl.framework/Headers -I/System/Library/Frameworks/ 
Tk.framework/Headers -I/opt/local/include/freetype2 -IlibImaging -I/ 
opt/local/include -I/Library/Frameworks/Python.framework/Versions/2.6/ 
include -I/usr/include -I/Library/Frameworks/Python.framework/Versions/ 
2.6/include/python2.6 -c Tk/tkImaging.c -o build/temp.macosx-10.3- 
i386-2.6/Tk/tkImaging.o -framework Tcl -framework Tk
In file included from /usr/include/math.h:26,
                  from /Library/Frameworks/Python.framework/Versions/ 
2.6/include/python2.6/pyport.h:235,
                  from /Library/Frameworks/Python.framework/Versions/ 
2.6/include/python2.6/Python.h:58,
                  from libImaging/ImPlatform.h:10,
                  from libImaging/Imaging.h:14,
                  from Tk/tkImaging.c:53:
/usr/include/architecture/ppc/math.h:675: warning: conflicting types  
for built-in function 'scalb'
i686-apple-darwin9-gcc-4.0.1: -framework: linker input file unused  
because linking not done
i686-apple-darwin9-gcc-4.0.1: Tcl: linker input file unused because  
linking not done
i686-apple-darwin9-gcc-4.0.1: -framework: linker input file unused  
because linking not done
i686-apple-darwin9-gcc-4.0.1: Tk: linker input file unused because  
linking not done
powerpc-apple-darwin9-gcc-4.0.1: -framework: linker input file unused  
because linking not done
powerpc-apple-darwin9-gcc-4.0.1: Tcl: linker input file unused because  
linking not done
powerpc-apple-darwin9-gcc-4.0.1: -framework: linker input file unused  
because linking not done
powerpc-apple-darwin9-gcc-4.0.1: Tk: linker input file unused because  
linking not done


And then it fails with:


gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -g - 
bundle -undefined dynamic_lookup build/temp.macosx-10.3-i386-2.6/ 
_imagingtk.o build/temp.macosx-10.3-i386-2.6/Tk/tkImaging.o -L/opt/ 
local/lib -L/usr/local/lib -L/Library/Frameworks/Python.framework/ 
Versions/2.6/lib -L/usr/lib -o build/lib.macosx-10.3-i386-2.6/ 
_imagingtk.so -framework Tcl -framework Tk
ld: in /opt/local/lib/libz.1.dylib, file is not of required  
architecture for architecture ppc
collect2: ld returned 1 exit status
lipo: can't open input file: /var/folders/gO/gOEfKG2kElSEfJYMJH7ijU++ 
+TI/-Tmp-//ccpZdO98.out (No such file or directory)
error: command 'gcc' failed with exit status 1


Is there a fix for this?

Rodrigo Ventura
Institute for Systems and Robotics
(www.isr.ist.utl.pt)
Instituto Superior Técnico
Lisbon, Portugal