[Python-Dev] zlib module build failure on Mac OSX 10.4.7 (original) (raw)

skip at pobox.com skip at pobox.com
Sun Jul 2 00:26:17 CEST 2006 

Ronald> What does /usr/lib/libz.dylib point to on your system?  

% cd /usr/lib
% ls -l libz.*
lrwxr-xr-x   1 root  wheel     12 Feb 12 00:32 libz.1.1.3.dylib -> libz.1.dylib
-rwxr-xr-x   1 root  wheel  72588 Jun 29 18:36 libz.1.2.3.dylib
lrwxr-xr-x   1 root  wheel     16 Feb 12 00:32 libz.1.dylib -> libz.1.2.3.dylib
lrwxr-xr-x   1 root  wheel     16 Feb 12 00:32 libz.dylib -> libz.1.2.3.dylib

Looks like everything on my system winds up at 1.2.3.

Ronald> What I don't understand yet is why your copy of libz doesn't
Ronald> have inflateCopy.

It appears to:

% nm libz.1.2.3.dylib | egrep -i inflate
         U _inflate
         U _inflateEnd
         U _inflateInit2_
         U _inflateReset
         U _inflate
         U _inflateEnd
         U _inflateInit_
libz.1.2.3.dylib(inflate.o):
9110ea18 T _inflate
911168cc T _inflateCopy
9110e5d8 T _inflateEnd
91116694 t _inflateGetHeader
9110dc84 T _inflateInit2_
9110e680 T _inflateInit_
91116524 t _inflatePrime
9110dddc T _inflateReset
91116584 T _inflateSetDictionary
91116744 T _inflateSync
91116888 T _inflateSyncPoint
         u _inflate_fast
         u _inflate_table
91116b90 T _inflateBack
91117a6c T _inflateBackEnd
91116a38 T _inflateBackInit_
         u _inflate_fast
         u _inflate_table
91118334 s _inflate_copyright
9111047c t _inflate_table
91110930 t _inflate_fast

However, even though the zlib.so is linked with -lz, there's no evidence of it in the otool -L output:

% make
case $MAKEFLAGS in \
*-s*)  CC='gcc' LDSHARED='gcc  -bundle -undefined dynamic_lookup' OPT='-DNDEBUG -g -O3 -Wall -Wstrict-prototypes' ./python.exe -E ../setup.py -q build;; \
*)  CC='gcc' LDSHARED='gcc  -bundle -undefined dynamic_lookup' OPT='-DNDEBUG -g -O3 -Wall -Wstrict-prototypes' ./python.exe -E ../setup.py build;; \
esac
running build
running build_ext
db.h: found (4, 2) in /sw/include/db4
db lib: using (4, 2) db-4.2
sqlite: found /usr/include/sqlite3.h
/usr/include/sqlite3.h: version 3.1.3
building 'zlib' extension
gcc -fno-strict-aliasing -Wno-long-double -no-cpp-precomp -mno-fused-madd -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -I. -I/Users/skip/src/python-svn/trunk/./Include -I/Users/skip/src/python-svn/trunk/./Mac/Include -I/Users/skip/local/include -I../Include -I. -I/usr/local/include -I/Users/skip/src/python-svn/trunk/Include -I/Users/skip/src/python-svn/trunk/build -c /Users/skip/src/python-svn/trunk/Modules/zlibmodule.c -o build/temp.macosx-10.3-ppc-2.5/Users/skip/src/python-svn/trunk/Modules/zlibmodule.o
/Users/skip/src/python-svn/trunk/Modules/zlibmodule.c: In function 'PyZlib_uncopy':
/Users/skip/src/python-svn/trunk/Modules/zlibmodule.c:724: warning: implicit declaration of function 'inflateCopy'
gcc -bundle -undefined dynamic_lookup build/temp.macosx-10.3-ppc-2.5/Users/skip/src/python-svn/trunk/Modules/zlibmodule.o -L/Users/skip/local/lib -L/usr/local/lib -lz -o build/lib.macosx-10.3-ppc-2.5/zlib.so -Wl,-search_paths_first
*** WARNING: renaming "zlib" since importing it failed: dlopen(build/lib.macosx-10.3-ppc-2.5/zlib.so, 2): Symbol not found: _inflateCopy
  Referenced from: build/lib.macosx-10.3-ppc-2.5/zlib.so
  Expected in: dynamic lookup

running build_scripts
montanaro:build% otool -L build/lib.macosx-10.3-ppc-2.5/zlib_failed.so 
build/lib.macosx-10.3-ppc-2.5/zlib_failed.so:
        /usr/lib/libmx.A.dylib (compatibility version 1.0.0, current version 93.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.1.6)

Ah, found it! There was an antique libz.a in /usr/local/lib dating from 2003. It's all better now.

Skip

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