huh? ld can't find library that is in /usr/lib

This is a discussion on huh? ld can't find library that is in /usr/lib within the C++ Programming forums, part of the General Programming Boards category; I'm trying to build dynagraph (a graph layout engine) but the linker can't find one of the libraries and I ...

  1. #1
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    huh? ld can't find library that is in /usr/lib

    I'm trying to build dynagraph (a graph layout engine) but the linker can't find one of the libraries and I can't figure out why.

    Code:
    g++ -static -g main.o IncrCalledBack.o DuplicateStream.o createConfiguration.o -Lincrface -lincrface -Ldynadag -ldynadag -Lpathplot -lpathplot -Lfdp -lfdp -Lshortspline -lshortspline -Lvoronoi -lvoronoi -Lcommon -ldynagraph -L/usr/lib/graphviz -lagraph -lpathplan -lcdt -lagraph -lboost_thread -pthread -o dynagraph-whole
    /usr/bin/ld: cannot find -lagraph
    collect2: ld returned 1 exit status
    make: *** [dynagraph-whole] Error 1
    The libraries seem to be present:
    Code:
    $ ls -l /usr/lib/libagraph*
    -rw-r--r-- 1 root root   808 2008-02-08 13:57 /usr/lib/libagraph.la
    lrwxrwxrwx 1 root root    18 2008-05-27 16:56 /usr/lib/libagraph.so -> libagraph.so.4.0.0
    lrwxrwxrwx 1 root root    18 2008-04-24 17:38 /usr/lib/libagraph.so.4 -> libagraph.so.4.0.0
    -rw-r--r-- 1 root root 61336 2008-02-08 13:57 /usr/lib/libagraph.so.4.0.0
    The directory /usr/lib should be in ld's search path (I even tried adding -L/usr/lib just in case). So why is ld complaining? Any pointers or hints on troubleshooting would be much appreciated!

    Cheers,
    Z.

  2. #2
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    The liblagraph.so is the shared library. You need the .ar version to link to your code. Usually, those come from a "-devel" variant when you install, e.g. you have "blah.2.9.rpm", and a "blah-devel.2.9.rpm" (rpm is just one of several types of "installable package" - yours may be one of many others).

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
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    Quote Originally Posted by matsp View Post
    The liblagraph.so is the shared library. You need the .ar version to link to your code. Usually, those come from a "-devel" variant when you install, e.g. you have "blah.2.9.rpm", and a "blah-devel.2.9.rpm" (rpm is just one of several types of "installable package" - yours may be one of many others).

    --
    Mats
    Thanks for the suggestion Mats. I have the deb package libgraphviz-dev installed:
    Code:
    $ dpkg -l libgraphviz*
    [..]
    ii  libgraphviz-dev         2.16-3ubuntu2           graphviz libs and headers against which to build applications
    rc  libgraphviz3            2.12-4ubuntu3           rich set of graph drawing tools
    un  libgraphviz3-dev        <none>                  (no description available)
    ii  libgraphviz4            2.16-3ubuntu2           rich set of graph drawing tools
    un  libgraphviz4-dev        <none>                  (no description available)
    This package supplies the shared libraries:
    Code:
    $ dpkg -L libgraphviz-dev | grep agraph
    /usr/include/graphviz/agraph.h
    /usr/lib/pkgconfig/libagraph.pc
    /usr/lib/libagraph.la
    /usr/share/man/man3/agraph.3.gz
    /usr/lib/libagraph.so
    Could it be that the package is missing the .ar ?

  4. #4
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    The problem appears to be related to the graphviz packages in Ubuntu 8.10. I installed from the latest stable graphviz sources and the linking problem goes away.

    However, I haven't found a satisfactory explanation. The libraries look very similar to those provided by the Ubuntu packages.

    Code:
    $ ls -l /usr/local/lib/ | grep agraph
    -rwxr-xr-x  1 root root      837 2008-05-28 14:50 libagraph.la
    lrwxrwxrwx  1 root root       18 2008-05-28 14:50 libagraph.so -> libagraph.so.4.0.0
    lrwxrwxrwx  1 root root       18 2008-05-28 14:50 libagraph.so.4 -> libagraph.so.4.0.0
    -rwxr-xr-x  1 root root   254507 2008-05-28 14:50 libagraph.so.4.0.0
    Cheers,
    Z.

  5. #5
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    Are you sure there's no other libagraph file(s) somewhere else?

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  6. #6
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    When you pass -lagraph to the linker, it's looking for a file named libagraph.a, no? If you want to statically link with libagraph.la, you have to explicitly pass that name to the linker.

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