I'm writing a code in C++ with MySQL Cpp Conn 6.1 to connect to a database and write data for later use. When trying to initialize the driver with driver = get_driver_instance(); it returns an error message:
Creating executable: out/gcc-debug//DB8.exe
out/gcc-debug//defaultSensor.o: In function `Z10dbWriteWiniiiii':
C:\Users\LuisH.Forchesatto\Dropbox\ProjetosOmnet++\DB8/dbWriteWin.h:35: undefined reference to `_imp___ZN3sql5mysql19get_driver_instanceEv'
collect2.exe: error: ld returned 1 exit status
Makefile:85: recipe for target 'out/gcc-debug//DB8.exe' failed
make: *** [out/gcc-debug//DB8.exe] Error 1
I tried to add mysqlcppconn to the link option (-lmysqlcppconn) but it returns the following error message:
Creating executable: out/gcc-debug//DB8.exe
C:\Users\LuisH.Forchesatto\Downloads\omnetpp-4.6\tools\win32\mingw32\bin/ld.exe: cannot find -lmysqlcppconn
collect2.exe: error: ld returned 1 exit status
Makefile:85: recipe for target 'out/gcc-debug//DB8.exe' failed
make: *** [out/gcc-debug//DB8.exe] Error 1
this error applies if I include the full path to mysqlcppconn.dll or .lib as well as including their directories to paths and symbols.
The non initialized driver variable may be causing crashes when trying to connect to the database so it needs to work.
The paths and symbols contains the includes for mysqlcppconn headers and boost library headers. The full code to the application is in the link below.
https://dl.dropboxusercontent.com/u/85576999/dbWriteWin.h
2 possible error causes,
I - you are refering to undeclered function or variable
II - you aren´t including the proper library in compilation time
Related
I just build the following package: faiss and my cpp program now recognises all library header so I can include them into my program. But my programm throws undefined reference to. So when I built faiss it created a libfaiss.a and a libfaiss.so which one to link and how??? I think I have tried any solution that I could find in the internet, but my knowledge of the build/linking process is limited.
My Faiss build-directory looks like this:
faiss-1.5.3/
-libfaiss.a
-libfaiss.so
-foo.h
-foo.o
-foo.cpp
-bar.h
-...
My tries. (I am using ROS, catkin_simple and gtests)
So this is how I would usually do it:
find_library(LibFaiss faiss HINT /home/tim/faiss/faiss-1_5_3/faiss-1.5.3/)
catkin_add_gtest(test_inverted_nn test/test_inverted-nn.cc
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}})
target_link_libraries(test_inverted_nn ${LIBRARY_NAME} ${LibFaiss})
I get the following Error:
/usr/bin/ld: cannot find -lLibFaiss-NOTFOUND}
collect2: error: ld returned 1 exit status
CMakeFiles/test_inverted_nn.dir/build.make:358: recipe for target '/home/tim/catkin_ws/devel/lib/nn/test_inverted_nn' failed
make[3]: *** [/home/tim/catkin_ws/devel/lib/inverted_nn/test_inverted_nn] Error 1
I also found this Solution here Import an external library into a ROS node, but that does not work for me:
add_library(libfaiss STATIC IMPORTED)
set_target_properties(libfaiss PROPERTIES IMPORTED_LOCATION /home/tim/faiss/faiss-1_5_3/faiss-1.5.3/libfaiss.a)
target_link_libraries(test_inverted_nn ${LIBRARY_NAME} ${libfaiss})
This throws the following Error:
/usr/bin/ld: cannot find -l}
collect2: error: ld returned 1 exit status
EDIT
After correcting the not_found error I am getting the following error:
CMake Warning at /opt/ros/melodic/share/catkin/cmake/test/gtest.cmake:180 (add_executable):
Cannot generate a safe runtime search path for target
test_inverted_multi_index because files in some directories may conflict
with libraries in implicit directories:
runtime library [libz.so.1] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
Some of these libraries may not be found correctly.
*** It does not matter what I add inside target_link_libraries I am always getting that error***
EDIT2
So with the tipp of #Aconcagua I deleted everything from the CMakeLists.txt and only added the following to my cmake options:
-DCMAKE_CXX_FLAGS=-L/home/tim/faiss/faiss-1_5_3/faiss-1.5.3/
But Im still getting the undefined reference errors. It does not make any difference
I'm using the CLion IDE and need to put some OpenGL files in. In the JetBrains/CLion folder there's a bin and lib folder. In the lib folder theres jar files, do I put the header and dlls in here?
get this error:
CMakeFiles\GL.dir/objects.a(main.cpp.obj): In function `glutInit_ATEXIT_HACK':
c:/mingw/include/gl/glut.h:486: undefined reference to `__glutInitWithExit'
CMakeFiles\GL.dir/objects.a(main.cpp.obj): In function `glutCreateWindow_ATEXIT_HACK':
c:/mingw/include/gl/glut.h:503: undefined reference to `__glutCreateWindowWithExit'
CMakeFiles\GL.dir/objects.a(main.cpp.obj): In function `glutCreateMenu_ATEXIT_HACK':
c:/mingw/include/gl/glut.h:549: undefined reference to `__glutCreateMenuWithExit'
collect2.exe: error: ld returned 1 exit status
CMakeFiles\GL.dir\build.make:86: recipe for target 'GL.exe' failed
mingw32-make.exe[3]: *** [GL.exe] Error 1
CMakeFiles\Makefile2:59: recipe for target 'CMakeFiles/GL.dir/all' failed
CMakeFiles\Makefile2:71: recipe for target 'CMakeFiles/GL.dir/rule' failed
mingw32-make.exe[2]: *** [CMakeFiles/GL.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles/GL.dir/rule] Error 2
Makefile:109: recipe for target 'GL' failed
mingw32-make.exe: *** [GL] Error 2
From the FAQ here:
At present CLion supports GCC and Clang compilers and is guided by these two to get the libraries and headers paths.
So it depends on the compiler CLion is using where it looks for the header files.
I'm trying to compile ROS (Robot Operating System) on a Raspberry Pi (Raspbian) following these instructions and got to the point to compile ROS, which fails at compiling opencv with undefined reference to 'header':
[ 97%] Built target opencv_videostab
[ 98%] Built target opencv_haartraining_engine
Linking CXX executable ../../bin/opencv_createsamples
../../lib/libopencv_highgui.so.2.4.6: undefined reference to `header'
collect2: ld returned 1 exit status
make[2]: *** [bin/opencv_createsamples] Error 1
make[1]: *** [apps/haartraining/CMakeFiles/opencv_createsamples.dir/all] Error 2
make: *** [all] Error 2
<== Failed to process package 'opencv2':
Command '/home/ilagi/ros_catkin_ws/install_isolated/env.sh make -j1 -l1' returned non-zero exit status 2
I googled to try to figure out what header file might be missing, but unfortunately didn't get anywhere.
I hope somebody will have an idea about at least the directions to go from here.
Thanks
I guess I'm going to answer my own question. I don't exactly know which dependency caused this particular error, but I had recompiled ffmpeg based on the instructions provided at http://ariandy1.wordpress.com/2013/02/13/raspberry-pi-rasbian-opencv/ and now I managed to get ROS to compile opencv.
I downloaded the MySQL Connector / C++ code from dev.mysql.com. I also used opkg to download the libmysqlclient-r-dev package, which gave me libmysqlclient_r.so and .la in my /usr/lib directory.
When I attempt to make the source code for the MySQL connector, I get the following error:
/usr/lib/gcc/arm-angstrom-linux-gnueabi/4.7.3/../../../../arm-angstrom-linux-gnueabi/bin/ld: cannot find -lmysqlclient_r
collect2: error: ld returned 1 exit status
make[2]: *** [driver/libmysqlcppconn.so.1.0.5] Error 1
make[1]: *** [driver/CMakeFiles/mysqlcppconn.dir/all] Error 2
make: *** [all] Error 2
It tells me that the library is missing, eventhough it is present in /usr/lib?
How does that work, and what should I do?
I'm using mingw-w64 (4.8.0) + cmake to build shared libraries for yaml-cpp (0.5.1). The project has a few build targets in the CMakeLists.txt that comes with it: the main library yaml-cpp and some test programs e.g. parse, which links the library.
The library target yaml-cpp itself built without error but it is followed by this error when parse is built:
Linking CXX executable parse.exe
CMakeFiles\parse.dir/objects.a(parse.cpp.obj):parse.cpp:(.text+0x1a3): undefined reference to `YAML::Load(std::istream&)'
CMakeFiles\parse.dir/objects.a(parse.cpp.obj):parse.cpp:(.text+0x1b2): undefined reference to `YAML::operator<<(std::ostream&, YAML::Node const&)'
c:/work/mingw64-4.8/bin/../lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles\parse.dir/objects.a(parse.cpp.obj): bad reloc address 0x0 in section `.data'
collect2.exe: error: ld returned 1 exit status
util\CMakeFiles\parse.dir\build.make:90: recipe for target 'util/parse.exe' failed
mingw32-make[3]: *** [util/parse.exe] Error 1
CMakeFiles\Makefile2:228: recipe for target 'util/CMakeFiles/parse.dir/all' failed
mingw32-make[2]: *** [util/CMakeFiles/parse.dir/all] Error 2
CMakeFiles\Makefile2:240: recipe for target 'util/CMakeFiles/parse.dir/rule' failed
mingw32-make[1]: *** [util/CMakeFiles/parse.dir/rule] Error 2
makefile:211: recipe for target 'parse' failed
mingw32-make: *** [parse] Error 2
I run into similar errors when I try to write small test programs using the library, and I don't know what is wrong. What might be the issue here?
Jesse Beder's comment points to the exact issue causing the error described in the question. A quick fix while this gets fixed in a follow-up release is to apply the patch (https://code.google.com/p/yaml-cpp/issues/detail?id=216#c4) to a clean copy of yaml-cpp 0.5.1. There is also a line that declares std::string node_data::empty_scalar in the source file src/node_data.cpp that should be commented out. After making these changes, the shared libraries and utilities build without error.