[CMake] Linking Problems when using Cmake

[David Cole]

Aren't both netapi32 and wsock32 Windows only libraries? You shouldn't 
even have them in your Linux link at all. Try removing them - you can 
conditionally add them by setting them into a CMake variable (when WIN32 
is true) and using that variable in the TARGET_LINK_LIBRARIES command.

Something like this:

IF(WIN32)
  SET(OS_SPECIFIC_LIBS netapi32 wsock32)
ELSE(WIN32)
  SET(OS_SPECIFIC_LIBS )
ENDIF(WIN32)

...

TARGET_LINK_LIBRARIES(
  ...
  ${OS_SPECIFIC_LIBS}
  ...
)


HTH,
David

Dalal, Dhaval wrote:

>Hi Everyone
>I am trying to compile Dcmtk(open-source Dicom Library), ITK and FLTK on my Linux Platform
>(gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-52))
>I got them successfulle compiled on the Windows Platform but I am facing strage errors on Linux and I have been unable to fix them.
>I have checked the order of libraries (in the way they are linked to the executable) and
>also tweaked around quite a bit but to no awail.
>The error i get is
>"Building executable /usr/local/gui/ti...
>/usr/bin/ld: cannot find -lnetapi32
>collect2: ld returned 1 exit status
>make[1]: *** [/usr/local/gui/ti] Error 1"
>
>My CMakeLists.txt file is
>------------------------------------------------------------ 
>PROJECT(DCMTKTEST)
>
>
>
>FIND_PACKAGE(DCMTK)
>
>FIND_PACKAGE(ZLIB)
>
>
> #Find ITK.
>
>FIND_PACKAGE(ITK)
>
>IF(ITK_FOUND)
>
>  INCLUDE(${ITK_USE_FILE})
>
>ELSE(ITK_FOUND)
>
>  MESSAGE( FATAL_ERROR 
>"Cannot build without ITK.  Please set ITK_DIR.")
>
>ENDIF(ITK_FOUND)
>
>
>
>
>
># Make sure the compiler can find include files from our library.
>
>INCLUDE_DIRECTORIES(
> ${DCMTK_DIR}/imagectn/include
> ${DCMTK_ofstd_INCLUDE_DIR}
>
> ${DCMTK_config_INCLUDE_DIR}
>
> ${DCMTK_dcmdata_INCLUDE_DIR}
> ${DCMTK_DIR}/dcmnet/include
>
> ${DCMTK_dcmingle_INCLUDE_DIR}
>
>  )
>
>
>
># set certain project wide flags
>
>#SET(CMAKE_C_FLAGS "" CACHE STRING "Flags for C compiler." FORCE)
>
>#SET(CMAKE_C_FLAGS_DEBUG "/nologo /MDd /W3 /GX /Z7 /Od /GR /YX " CACHE STRING "Win32 Debug Options #C Code" FORCE)
>
>#SET(CMAKE_C_FLAGS_RELEASE "/nologo /MD /W3 /GX /O2 /GR /YX" CACHE STRING "Win32 Release Options C #Code" FORCE)
>
>#SET(CMAKE_CXX_FLAGS "" CACHE STRING "Flags used by the compiler during all build types." FORCE)
>
>#SET(CMAKE_CXX_FLAGS_DEBUG "/nologo /MDd /W3 /GX /Z7 /Od /GR /YX" CACHE STRING "Win32 Debug #Options C++ Code" FORCE)
>
>#SET(CMAKE_CXX_FLAGS_RELEASE "/nologo /MD /W3 /GX /O2 /GR /YX" CACHE STRING "Win32 Release Options #C++ Code" FORCE)
>
>#SET(CMAKE_EXE_LINKER_FLAGS "/INCREMENTAL:NO" CACHE STRING "Win32 Linker Flags" FORCE)
>
>
>
>FIND_LIBRARY(DCMTK_imagedb_LIBRARY libimagedb ${DCMTK_DIR}/imagectn/libsrc)
>
>FIND_LIBRARY(DCMTK_dcmnet_LIBRARY dcmnet ${DCMTK_DIR}/dcmnet/libsrc)
>
>
>
>
>
># set _REENTRANT flag
>
>ADD_DEFINITIONS(-D_REENTRANT)
>
>ADD_DEFINITIONS(-DHAVE_CONFIG_H)
>
> 
>
>
>
>INCLUDE(${CMAKE_ROOT}/Modules/FindFLTK.cmake)
>
>IF(HAS_FLTK)
>
>  INCLUDE_DIRECTORIES(
>
>    ${FLTK_INCLUDE_DIR}
>
>    )
>
>  LINK_LIBRARIES( 
>
>    ${FLTK_LIBRARIES}
>
>    )
>
>ENDIF(HAS_FLTK)
>
>
>
>INCLUDE_DIRECTORIES(
>
>  ${DCMTKTEST_SOURCE_DIR} 
>
>  ${DCMTKTEST_BINARY_DIR} 
>
>  ) 
>
>
>
>#IF(CYGWIN)
>
>#  LINK_LIBRARIES(ole32 uuid comctl32 wsock32 supc++ -lm -lgdi32)
>
>#ENDIF(CYGWIN)
>
>
>
>SET( DCMTK_GUI_SRCS
>
>  dcmtkui.fl
>
>  prefsui.fl
>
> )
>
>
>
>IF(FLTK_WRAP_UI)
>
>  FLTK_WRAP_UI(ti ${DCMTK_GUI_SRCS})
>
> ENDIF(FLTK_WRAP_UI)
>
>
>
>SET(DCMTKTEST_SRCS
>
>  cnf.h
>
>  cnf.cxx
>
>  cnfexnt.cxx
>
>  cnfpriv.cxx
>
>  cnfpriv.h
>  main.cpp
>
>  ti.cxx 
>
>  ti.h
>
>  tinet.cxx
>
>  tinet.h 
>
>  tiquery.cxx
>
>  tiquery.h
>
>  tiui.cxx
>
>  tiui.h
>
>  prefs.h
>
>  prefs.cpp
>
>  dcmtk.h
>
>  dcmtk.cpp 
>
>  )
>
>
>
>ADD_EXECUTABLE( ti ${DCMTKTEST_SRCS} )
>
>
>
>
>
> TARGET_LINK_LIBRARIES(
>
>  ti 
>
>  netapi32
>  wsock32
>  ${DCMTK_ofstd_LIBRARY} 
>  ${DCMTK_dcmdata_LIBRARY}
>  ${DCMTK_dcmnet_LIBRARY}
>  ${DCMTK_imagedb_LIBRARY}
>
>  ${DCMTK_dcmimgle_LIBRARY}
>  ${ZLIB_LIBRARY} 
> # ITKCommon
>
> )
>------------------------------------------------------  
> If i change the order , like 
> TARGET_LINK_LIBRARIES(
>  ti 
>  wsock32
>  netapi32
>  ${DCMTK_ofstd_LIBRARY} 
>  ${DCMTK_dcmdata_LIBRARY}
>  ${DCMTK_dcmnet_LIBRARY}
>  ${DCMTK_imagedb_LIBRARY}
>  ${DCMTK_dcmimgle_LIBRARY}
>  ${ZLIB_LIBRARY} 
> # ITKCommon
> )
>
>I get the following error
>"Building dependencies. cmake.depends...
>Building executable /usr/local/gui/ti...
>/usr/bin/ld: cannot find -lwsock32
>collect2: ld returned 1 exit status"
>
>I am sure its some linking problem...
>any help/hints will be greatly appreciated.
>Thanks
>Dhaval
>
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>