can not link library files

asked 2011-09-13 01:52:36 -0600

abhinav
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updated 2011-09-13 02:04:18 -0600

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Hi, I am using ubuntu natty 11.04 and i am trying to use external library: ueye_api while using ueye camera to capture frames and publish them as ros messages by creating a node roscam

To include external library files I made the necessary changes in CMakeLists.txt file:

rosbuild_add_executable(roscam src/roscam.cpp)
link_directories(/usr/lib /usr/local/share/ueye/ /usr/include /usr/local/share/ueye/ueyeusbd)
include_directories(/usr/lib /usr/local/share/ueye/ /usr/include /usr/local/share/ueye/ueyeusbd)
target_link_libraries(roscam libueye_api libueye_api.so libueye_api.so.1 libueye_api.so.3.82)

But still I received following error while compiling a program:

 Linking CXX executable ../bin/roscam
  /usr/bin/ld: cannot find -llibueye_api
  /usr/bin/ld: cannot find -llibueye_api.so.1
  /usr/bin/ld: cannot find -llibueye_api.so.3.82
  collect2: ld returned 1 exit status

answered 2011-09-13 02:09:21 -0600

dornhege

31395 ●134 ●284 ●498

The linker cannot find the libraries in the directories you specified. Where are the files located?

You can check with VERBOSE=1 make what the exact linker line is. There should be an entry like -L<dir to library> -l<library_name>.

Your cmake file should only need to contain include_directories() for the directory where the header files are (e.g. /usr/include, and other system includes should not need to be listed here). link_directories should only contain the directory where the library files are.

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Thanks!! it is working by removing the link_directories() command and in include_directories() by removing the unnecessary directories and just keeping /usr/include which contains the header file. And also the libraries libueye_api.so.1 and libueye_api.so.3.82 are not required

abhinav ( 2011-09-13 03:26:17 -0600 )edit

actually /usr/include shouldn't be required

dornhege ( 2011-09-13 06:04:10 -0600 )edit

Yes it should because I was initially trying to link it with some unnecessary library files which it could not find anyway.

abhinav ( 2011-09-13 19:37:00 -0600 )edit

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