Hi Robert,
>Just disabling the FIND_LIBRARY(MATH_LIBRARY m) for all Apple builds
>doesn't feel right. The are lots of other Apple developers using the
>CMake build and haven't had problems with these particular line of the
>OpenSceneGraph/CMakeLists.txt so I am surprised that you are having
>problems. Given that there is chance that making this change will
>break the build for other Apply developers I feel that this specific
>change is inappropriate to apply at this time.
>
>It would be useful to try and work what combination of OS/XCode that
>the problem you see exists and where it doesn't exist, and where the
>MATH_LIBRARY needs to be defined, and where not. Could you write a
>post to osg-users explaining the error you are seeing and the version
>of the OSX/XCode etc and call for feedback from other OSX users. From
>this feedback we can try and come up with a workable solution.
This linker problem surfaced after I switched from Fink to MacPorts.
Apple doesn't really have "libm" but rather has 2 symlinks:
........
[j...@mac]:/usr/lib dir libm.*
lrwxr-xr-x 1 root wheel 15 Apr 12 2009 libm.dylib -> libSystem.dylib
[j...@mac]:/Developer/SDKs/MacOSX10.4u.sdk/usr/lib dir libm.dylib
lrwxr-xr-x 1 root wheel 15 Aug 16 18:49 libm.dylib -> libSystem.dylib
........
The linker gets confused by these two different libSystem.dylib.
Removing "/usr/lib/libm.dylib" from the linker's args solves the problem.
So OSG has been linking the "UNIX way" but not the "Apple way"
(since UNIX includes APPLE on cmake).
Don't know if changing this would break Leopard/SnowLeopard
(I'm using Tiger).
Maybe try this change in OSG's development branch???
IF(UNIX)
# Not sure what this will do on Cygwin and Msys
# Also, remember OS X X11 is a user installed option so it may not exist.
FIND_PACKAGE(X11)
# Some Unicies need explicit linkage to the Math library or the build fails.
IF(NOT APPLE)
FIND_LIBRARY(MATH_LIBRARY m)
ENDIF(NOT APPLE)
............................................................................
Linking CXX shared library ../../lib/libosgText.dylib
cd /Users/jimb/tmp/OpenSceneGraph-2.8.2-squareBracketFix-appleMacFix/src/osgText
&& /opt/local/bin/cmake -E cmake_link_script CMakeFiles/osgText.dir/link.txt --
verbose=1
/usr/bin/c++ -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-vers
ion-min=10.4 -O2 -mmacosx-version-min=10.4 -ftree-vectorize -fvisibility-inline
s-hidden -dynamiclib -headerpad_max_install_names -compatibility_version 55.0.0
-current_version 2.8.2 -o ../../lib/libosgText.2.8.2.dylib -install_name /Users/
jimb/tmp/OpenSceneGraph-2.8.2-squareBracketFix-appleMacFix/lib/libosgText.55.dyl
ib CMakeFiles/osgText.dir/DefaultFont.cpp.o CMakeFiles/osgText.dir/Font.cpp.o CM
akeFiles/osgText.dir/Font3D.cpp.o CMakeFiles/osgText.dir/String.cpp.o CMakeFiles
/osgText.dir/FadeText.cpp.o CMakeFiles/osgText.dir/TextBase.cpp.o CMakeFiles/osg
Text.dir/Text.cpp.o CMakeFiles/osgText.dir/Text3D.cpp.o
CMakeFiles/osgText.dir/Version.cpp.o ../../lib/libosgDB.2.8.2.dylib
../../lib/libosg.2.8.2.dylib ../../lib/libOpenThreads.2.4.0.dylib -framework AGL
-framework OpenGL /usr/lib/libm.dylib
-lpthread -framework Carbon -framework AGL -framework OpenGL
ld: Undefined symbols:
_acl_copy_ext_native referenced from CarbonCore expected to be defined in libSys
tem
_acl_copy_int_native referenced from CarbonCore expected to be defined in libSys
tem
_task_name_for_pid referenced from CarbonCore expected to be defined in libSyste
m
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/libtool: internal link edit command
failed
make[2]: *** [lib/libosgText.2.8.2.dylib] Error 1
make[1]: *** [src/osgText/CMakeFiles/osgText.dir/all] Error 2
make: *** [all] Error 2
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