How to find specific/local files via CMake

Question

I have a problem with a locally installed library. In my project there is the xmlrpc++0.7-library:

myproject/
 +-- xmlrpc++0.7/
      +-- src/

I want CMake to fallback using the local xmlrpc++0.7 directory if not found otherwise. Two problems, the first one, find_path() or find_library() does not work with local dir. I used a workaround testing if variables processed by find_xxx() are empty or not. If empty I set them manually. The cmake generates the Makefile without errors now. But if I want to compile the project via make, the c++ compiler returns "error: XmlRpc.h: file not found". The file XmlRpc.h lies in myproject/xmlrpc++0.7/src and if I compile all them manually it works fine.

Here is my CMakeLists.txt. I am very happy if anyone could me point to the right solution to use cmake under conditions described above.

--- CMakeLists.txt ---

project(webservice_tesseract)
cmake_minimum_required(VERSION 2.6)
set(CMAKE_INCLUDE_CURRENT_DIR ON)

# find tesseract
find_path(TESSERACT_INCLUDE_DIR tesseract/tesseractmain.h
        /opt/local/include
 /usr/local/include
 /usr/include
 )
find_library(TESSERACT_LIBRARY_DIR 
 NAMES tesseract_main
 PATHS 
 /opt/local/lib/
 /usr/local/lib/
 /usr/lib
 )
message(STATUS "looked for tesseract library.")
message(STATUS "Include file detected: [${TESSERACT_INCLUDE_DIR}].")
message(STATUS "Lib file detected: [${TESSERACT_LIBRARY_DIR}].")
add_library(tesseract STATIC IMPORTED)
set_property(TARGET tesseract PROPERTY IMPORTED_LOCATION 
 ${TESSERACT_LIBRARY_DIR}/libtesseractmain.a
 )

#find xmlrpc++
message(STATUS "cmake home dir: [${CMAKE_HOME_DIRECTORY}].")
set(LOCAL_XMLRPCPLUSPLUS ${CMAKE_HOME_DIRECTORY}/xmlrpc0.7++/)
message(STATUS "xmlrpc++ local dir: [${LOCAL_XMLRPCPLUSPLUS}].")
find_path(XMLRPCPLUSPLUS_INCLUDE_DIR XmlRpcServer.h
 ${LOCAL_XMLRPCPLUSPLUS}src
 /opt/local/include
 /usr/local/include
 /usr/include
 )
find_library(XMLRPCPLUSPLUS_LIBRARY_DIR 
 NAMES XmlRpc
 PATHS 
 ${LOCAL_XMLRPCPLUSPLUS}
 /opt/local/lib/
 /usr/local/lib/
 /usr/lib/
 )
# next lines are an ugly workaround because cmake find_xxx() does not find local stuff
if (XMLRPCPLUSPLUS_INCLUDE_DIR)
else (XMLRPCPLUSPLUS_INCLUDE_DIR)
 set(XMLRPCPLUSPLUS_INCLUDE_DIR ${LOCAL_XMLRPCPLUSPLUS}src)
endif (XMLRPCPLUSPLUS_INCLUDE_DIR)
if (XMLRPCPLUSPLUS_LIBRARY_DIR)
else (XMLRPCPLUSPLUS_LIBRARY_DIR)
 set(XMLRPCPLUSPLUS_LIBRARY_DIR ${LOCAL_XMLRPCPLUSPLUS})
endif (XMLRPCPLUSPLUS_LIBRARY_DIR)
message(STATUS "looked for xmlrpc++ library.")
message(STATUS "Include file detected: [${XMLRPCPLUSPLUS_INCLUDE_DIR}].")
message(STATUS "Lib file detected: [${XMLRPCPLUSPLUS_LIBRARY_DIR}].")
add_library(xmlrpc STATIC IMPORTED)
set_property(TARGET xmlrpc PROPERTY IMPORTED_LOCATION 
 ${XMLRPCPLUSPLUS_LIBRARY_DIR}/libXmlRpc.a
 )
#### link together
include_directories(${XMLRPCPLUSPLUS_INCLUDE_DIR} ${TESSERACT_INCLUDE_DIR})
link_directories(${XMLRPCPLUSPLUS_LIBRARY_DIR} ${TESSERACT_LIBRARY_DIR})
add_library(simpleocr STATIC simple_ocr.cpp)
add_executable(webservice_tesseract webservice.cpp)
target_link_libraries(webservice_tesseract xmlrpc tesseract simpleocr)

Answer 1

the problem is solved. Here is my new CMakeLists.txt:

project(webservice_tesseract)
cmake_minimum_required(VERSION 2.6)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# find tesseract
find_path(TESSERACT_INCLUDE_DIR tesseract/tesseractmain.h
    /opt/local/include
    /usr/local/include
    /usr/include
    )
find_library(TESSERACT_LIBRARY 
    NAMES tesseract_main
    PATHS 
    /opt/local/lib/
    /usr/local/lib/
    /usr/lib
    )
message(STATUS "looked for tesseract library.")
message(STATUS "Include file detected: [${TESSERACT_INCLUDE_DIR}].")
message(STATUS "Lib file detected: [${TESSERACT_LIBRARY}].")
add_library(tesseract STATIC IMPORTED)
set_property(TARGET tesseract PROPERTY IMPORTED_LOCATION 
    ${TESSERACT_LIBRARY}
    )
#find xmlrpc++
message(STATUS "cmake home dir: [${CMAKE_HOME_DIRECTORY}].")
set(LOCAL_XMLRPCPLUSPLUS ${CMAKE_HOME_DIRECTORY}/xmlrpc++0.7/)
message(STATUS "xmlrpc++ local dir: [${LOCAL_XMLRPCPLUSPLUS}].")
find_path(XMLRPCPLUSPLUS_INCLUDE_DIR XmlRpc.h
    ${LOCAL_XMLRPCPLUSPLUS}src
    /opt/local/include
    /usr/local/include
    /usr/include
    )
find_library(XMLRPCPLUSPLUS_LIBRARY 
    NAMES XmlRpc
    PATHS 
    ${LOCAL_XMLRPCPLUSPLUS}
    /opt/local/lib/
    /usr/local/lib/
    /usr/lib/
    )
message(STATUS "looked for xmlrpc++ library.")
message(STATUS "Include file detected: [${XMLRPCPLUSPLUS_INCLUDE_DIR}].")
message(STATUS "Lib file detected: [${XMLRPCPLUSPLUS_LIBRARY}].")
add_library(xmlrpc STATIC IMPORTED)
set_property(TARGET xmlrpc PROPERTY IMPORTED_LOCATION 
    ${XMLRPCPLUSPLUS_LIBRARY}
    )
#### link together
include_directories(${XMLRPCPLUSPLUS_INCLUDE_DIR} ${TESSERACT_INCLUDE_DIR})
link_directories(${XMLRPCPLUSPLUS_LIBRARY} ${TESSERACT_LIBRARY})
add_library(simpleocr STATIC simple_ocr.cpp)
add_executable(webservice_tesseract webservice.cpp)
target_link_libraries(webservice_tesseract xmlrpc tesseract simpleocr)