Compiling apiextractor on Mac OS X failed (lib not found libxml2)

  • Hi,

    I've been trying to compile PySide on my Mac OS X 10.7 Lion machine, but got stuck right away when I tried to compile apiextractor.

    The cmake process ended fine, except that it says it couldn't find libxslt and sphinx-build, so doc target is disabled. But then this happened:

    Linking CXX shared library tests/libapiextractor.dylib
    ld: framework not found libxml2
    collect2: ld returned 1 exit status
    make[2]: *** [tests/libapiextractor.0.10.6.dylib] Error 1
    make[1]: *** [CMakeFiles/apiextractor.dir/all] Error 2
    make: *** [all] Error 2

    After some searching I found that Mac OS X does have libxml2 as a framework, which is at /Library/Frameworks/libxml2.framework. But after make VERBOSE=1 I found that the linking command does have the right search path specified:

    /usr/bin/c++ -F/Library/Frameworks -Wall -fvisibility=hidden -dynamiclib -Wl,-headerpad_max_install_names -compatibility_version 0.10.0 -current_version 0.10.6 -o [blah blah blah] -F/usr/local/Cellar/qt/4.7.4/lib /usr/lib/libxslt.dylib -framework libxml2 -framework QtCore -framework QtXmlPatterns -framework QtXml

    (I'm trying to build PySide against Qt from Homebrew, thus the -F/usr/local/Cellar path. But that doesn't seem to be the problem.)

    As above, there is a -F/Library/Frameworks in the flags, but the linker still couldn't find libxml2. I am not really familiar with cmake, and am really in a lost now.

    Thanks for the help in advance.

  • On a standard OS X installation (checked against 10.6/Snow Leo and 10.7/Lion), there is no libxml2 framework, but only a regular shared library in /usr/lib/libxml2.dylib. You should try to link against that lib, not a framework by using "-lxml2" instead of "-framework libxml2".

  • Thanks for the info. I've read some articles on the Internet that said the same, but since my machine does have /Library/Frameworks/libxml2.framework (see below), I thought this was added in Lion. Seems like I was wrong, maybe it came from some other package I installed.

    I edited CMakeLists.txt and changed
    and the building succeeded. thanks!

    Another question: I'm not familiar with cmake, is there a "better" way of doing this, like specifying some flags in the cmake command? Manually editing CMakeLists.txt doesn't seem very standard, and would be hard to document if I wish to explain this build flow to someone else.


    Below is a snip of the output of cmake:

    -- Found Qt4: /usr/local/bin/qmake (found suitable version "4.7.4", required is "4.5.0")
    -- Found LibXml2: /Library/Frameworks/libxml2.framework (Required is at least version "2.6.32")
    -- checking for module 'libxslt'
    -- package 'libxslt' not found
    -- Found LibXslt: /usr/lib/libxslt.dylib (Required is at least version "1.1.19")
    -- sphinx-build - not found! doc target disabled

    Seems that LibXml2 is found by cmake, but the path is not recognized by the linker? Don't understand...

  • Sorry, I'm not familiar with CMake, so I'm of no help here. You might want to ask in one of the CMake users help channels.

  • OK, will do, thanks.

    By the way, after some probing I found my libxml2.framework under /Library/Frameworks seems to be corrupted for some reason. This explains why the linker can't link it even though cmake "recognizes" the framework.

    Thanks for all the info.

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