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July 2008
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2008.07.10 01:54 "Building a four way universal libtiff under OS X", by David Hoerl
Previously, i was able to build libtiff as a two-way 32bit/64bit
library on either a Intel or a PPC machine. I could build it fully
4-way universal too, but it failed on the non-build platform.
I posted about this in Feb 2007.
What I found was that two tiff header files ended up with the wrong
ENDIAN defines - these end up set to the build machine's values and
not the architecture you are trying to build.
I'm almost certain that the root cause is this snippet from configure.ac:
dnl ---------------------------------------------------------------------------
dnl Configure legacy tifconf.h HOST_BIGENDIAN.
dnl ---------------------------------------------------------------------------
if test "$ac_cv_c_bigendian" = yes ; then
HOST_BIGENDIAN=1
else
HOST_BIGENDIAN=0
fi
AC_DEFINE_UNQUOTED(HOST_BIGENDIAN,$HOST_BIGENDIAN,[Native cpu byte
order: 1 if big-endian (Motorola) or 0 if little-endian (Intel)])
The variable ac_cv_c_bigendian is set in the configure script itself
and reflects the host machine.
So, what I did was hacked my ksh script to run the affected header
files through "sed" to properly set these values. The script builds
4-way Universal library (both a .a and a .dylib), but I have not yet
verified that it functions properly on the alternate build machine
(it should given the fix to the previously identified problem).
If anyone wants to download the script and try it, you can get it
from: http://web.mac.com/dhoerl/Home/Tech_Blog/Tech_Blog.html
All you have to do is move it to the libtiff (3.8.2) top level
directory and run it as ./UniBld.sh
David
PS: The 32 / 64 bit library has been working for me just fine for a
few months now.