undefined reference to symbol 'dlopen@@GLIBC_2.1'

[abassign]

In Kubuntu / Ubuntu ("raring" - 13.4) I'm trying to compile with "sh download_and_compile.sh" script, but I always get an error:

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[ 34%] Building CXX object src/Main/CMakeFiles/fgfs.dir/__/Viewer/splash.cxx.o
Linking CXX executable fgfs
[ 94%] Built target fgfs
Linking CXX executable metar
[ 95%] Built target metar
[ 95%] Built target FGAdminUI
Linking CXX executable fgadmin
/usr/bin/ld: /usr/lib/i386-linux-gnu/libfltk.a(Fl_Preferences.o): undefined reference to symbol 'dlopen@@GLIBC_2.1'
/usr/bin/ld: note: 'dlopen@@GLIBC_2.1' is defined in DSO /lib/i386-linux-gnu/libdl.so.2 so try adding it to the linker command line
/lib/i386-linux-gnu/libdl.so.2: could not read symbols: Operazione non valida
collect2: error: ld returned 1 exit status
make[2]: *** [utils/fgadmin/src/fgadmin] Errore 1
make[1]: *** [utils/fgadmin/src/CMakeFiles/fgadmin.dir/all] Errore 2
make: *** [all] Errore 2


Can anyone help me ?

[Curtis]

it's better to use the classic way with "cmake" :

I suppose you have extracted the source code in /home/user/flightgear

just type :

Code: Select all

cd /home/user/flightgear/flightgear2.10.0
    mkdir fgbuild
    cd fgbuild
    cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
    make install

[abassign]

Unfortunately, the problem is definitely not what the configuration of CMAKE, but something about libraries, when I installed the Kubuntu / Ubuntu 12.10 no problem, instead when I installed Kubuntu / Ubuntu 13.04 are no longer able to compile, I'd like to know if someone has experienced the same problem.

[Curtis]

try to install libc6-dev package,

Code: Select all

sudo apt-get install libc6-dev

probably some "dev packages" are missing in your ubuntu, check what "dev packages" are available for your Ubuntu 13.04 and install them, sometimes there is a meta package "development" who installs all the required packages for software development,

you can also try this before compiling :

Code: Select all

export LDFLAGS="$LDFLAGS -ldl"

[abassign]

The library "libc6-dev" was present in the system, and the command
"export LDFLAGS =" $ LDFLAGS-ldl "" did not give Nessu result.

Code: Select all

[  0%] Built target fgjs
[  0%] Built target js_demo
[  5%] Built target yasim
[ 11%] Built target yasim-proptest
[ 27%] Built target JSBSim
[ 94%] Built target fgfs
[ 95%] Built target metar
[ 95%] Built target FGAdminUI
Linking CXX executable fgadmin
/usr/bin/ld: /usr/lib/i386-linux-gnu/libfltk.a(Fl_Preferences.o): undefined reference to symbol 'dlopen@@GLIBC_2.1'
/usr/bin/ld: note: 'dlopen@@GLIBC_2.1' is defined in DSO /usr/lib/gcc/i686-linux-gnu/4.7/../../../i386-linux-gnu/libdl.so so try adding it to the linker command line
/usr/lib/gcc/i686-linux-gnu/4.7/../../../i386-linux-gnu/libdl.so: could not read symbols: Operazione non valida
collect2: error: ld returned 1 exit status
make[2]: *** [utils/fgadmin/src/fgadmin] Errore 1
make[1]: *** [utils/fgadmin/src/CMakeFiles/fgadmin.dir/all] Errore 2
make: *** [all] Errore 2


My impression is that there is a problem on some version in the library, but I do not understand on what library!

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/usr/bin/ld: /usr/lib/i386-linux-gnu/libfltk.a(Fl_Preferences.o): undefined reference to symbol 'dlopen@@GLIBC_2.1'


[Curtis]

the command
"export LDFLAGS =" $ LDFLAGS-ldl "" did not give Nessu result.

be careful with the syntax, it's :

export LDFLAGS="$LDFLAGS -ldl"

not "export LDFLAGS =" $ LDFLAGS-ldl "

try also :

export LDFLAGS="-ldl"

try also to compil another software in order to see if the same problem happens again, it may caused by a bad configuration of your environment variables for gcc,

ubuntu 13.04 is not again a stable version, some bugs like this may exist

[abassign]

I could not resolve the error, I'd like to understand what the message of cmake! Someone can explain it to me?

[Soitanen]

Confirm error. Installed Ubuntu 13.04 (release) and get the same error. 12.10 worked correctly.

[Soitanen]

Now I have temporary solution of the problem:
you need to edit /dir-where-script-lives/fgfs/flightgear/utils/CMakeLists.txt and make comments instead of first 7 string:

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#if(FLTK_FOUND)
#    if (EXISTS ${FLTK_FLUID_EXECUTABLE})
#        add_subdirectory(fgadmin)
#    else ()
#        message(STATUS "fluid executable not found, disabling fgadmin")
#    endif ()
#endif()

FG compiles normally, but FGRun fails in compiling with the same error about 'DLOPEN@@GLIBC_2.1'.

[Trez]

Experiencing the exact same problem. Worked fine with Linux Mint 14 Cinnamon

[chris_blues]

Same here!

The answer is here:
viewtopic.php?f=45&t=17504

Code: Select all

sudo apt-get remove libfltk1.3-dev

did the trick...

apparently, in order to compile fgrun, it needs to be installed again afterwards...

[Trez]

Well,

I got Flightgear running somehow using Soitanen's solution. All you actually need is FGFS, FGDATA, OSG, FGX(or your favorite launcher) and SIMGEAR.

Happy Flying!

[chris_blues]

Yea, but these are ugly workarounds. I wonder what the real trouble is here! Avoiding the problem by simply not compiling fgadmin is not really a sloution in my eyes. Mostly only few people use fgadmin, I almost never do. But installing the whole world scenery by hand would take days!
So, if anyone could provide some info, what is going on here, I would be very happy!

Cheers
chris

[callahanp]

The problem appears to be flaky behavior of the fltk cmake module.

Here's what we need to figure out what's really going on:

Someone who still has 12.10 installed: find the exact gcc command that your build uses to build fgrun and fgadmin.
This should include all the link libraries such as fltk etc.

Lets start there.

Other info is out there about this bug. We are not alone in this. Several other applications are also having the same trouble building.

libdl appears to be the library that is not showing up correctly when the linker is trying to link the executable.
This happesn for me on compiling FGRUN, during the cmake step. Cmake fails because it cannot compile the very short program that tests that a compile works under FLTK 1.3. It fails for the same reason as a full build of FGRUN. You can get the full build by removing the section of code from the FGRUN CMakeLists.txt.

[callahanp]

More information about this:

Workaround:

You can get fgrun to build by changing two sections of the FGRUN CMakeLists.txt, then rerun the FGRUN build without downloading updated sources. Not dowloading the sources preserves your change to CmakeLists.txt


Change 1: add to CmakeLists.txt, the line

list(APPEND FLTK_LIBRARIES -ldl)

about lines 204 to 207 should look like this:

if ( FLTK_FOUND )
list(APPEND FLTK_LIBRARIES -ldl)

if ( X11_Xinerama_FOUND )


Comment out the check for FLTK 1.3 it doesn't work with this change
Near Lines 220 through 230 should look like this:

# check_cxx_source_runs(
# "#include <FL/Fl.H>
# int main() {
# return Fl::version() >= 1.03 ? 0 : -1;
# }
# "
# HAVE_FLTK_1_3)
#
# if ( NOT HAVE_FLTK_1_3 )
# message( SEND_ERROR "FLTK 1.3 is required" )
# endif ( NOT HAVE_FLTK_1_3 )

next just run

./download_and_compile.sh -d n -p n FGRUN


Background info:

Below is the working link for FGRUN with -dl added in the list of fltk libraries. Without the fix, its broken.

Linking CXX executable fgrun
cd /home/pac1/work/dc1/patching/p1/build/fgrun/src && /usr/bin/cmake -E cmake_link_script CMakeFiles/fgrun.dir/link.txt --verbose=1
/usr/bin/c++ -O3 -D__STDC_CONSTANT_MACROS -D_REENTRANT -DENABLE_NLS -O3 -DNDEBUG CMakeFiles/fgrun.dir/wizard_funcs.cxx.o CMakeFiles/fgrun.dir/advanced_funcs.cxx.o CMakeFiles/fgrun.dir/AirportBrowser.cxx.o CMakeFiles/fgrun.dir/AirportTable.cxx.o CMakeFiles/fgrun.dir/Fl_Table.cxx.o CMakeFiles/fgrun.dir/Fl_Table_Row.cxx.o CMakeFiles/fgrun.dir/Fl_OSG.cxx.o CMakeFiles/fgrun.dir/Fl_Heading_Dial.cxx.o CMakeFiles/fgrun.dir/main.cxx.o CMakeFiles/fgrun.dir/io.cxx.o CMakeFiles/fgrun.dir/fgfsrc.cxx.o CMakeFiles/fgrun.dir/logwin.cxx.o CMakeFiles/fgrun.dir/parkingloader.cxx.o CMakeFiles/fgrun.dir/settings.cxx.o CMakeFiles/fgrun.dir/util.cxx.o CMakeFiles/fgrun.dir/run_posix.cxx.o CMakeFiles/fgrun.dir/fgrun_pty.cxx.o -o fgrun -rdynamic libWizard.a libAdvanced.a /home/pac1/work/dc1/patching/p1/install/simgear/lib/i386-linux-gnu/libSimGearScene.a /home/pac1/work/dc1/patching/p1/install/simgear/lib/i386-linux-gnu/libSimGearCore.a /home/pac1/work/dc1/patching/p1/install/simgear/lib/i386-linux-gnu/libSimGearCore.a -lpthread -lz -lrt /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgText.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgDB.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgParticle.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgUtil.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgViewer.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgGA.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosg.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libOpenThreads.so /usr/lib/i386-linux-gnu/libfltk_images.a /usr/lib/i386-linux-gnu/libfltk_forms.a /usr/lib/i386-linux-gnu/libfltk_gl.a -lGL /usr/lib/i386-linux-gnu/libfltk.a -lSM -lICE -lX11 -lXext -lm -ldl -lXinerama -lXft -lz -lutil -lrt /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgText.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgDB.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgParticle.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgUtil.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgViewer.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosgGA.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libosg.so /home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib/libOpenThreads.so -lGL -lSM -lICE -lX11 -lXext -lm -ldl -lXinerama -lXft -lutil -lpng -lz -ljpeg -lXft -lfontconfig -lXinerama -lX11 -lm -lGLU -lGL -Wl,-rpath,/home/pac1/work/dc1/patching/p1/install/OpenSceneGraph/lib: