[CMake] problem with Xerces-C++ 2.7

[Tristan Carel]

On 3/8/07, Pierre Malarme <pmalarme at ulb.ac.be> wrote:
> I have a problem using Xerces-C++ with cmake. I'm on Mac OS X 10.4.8 with an
> Intel Core 2 Duo. I try to compile a parser.cpp file with nothing more that
> includes that i need. When i do so, i have this error message in return :
>
> [100%] Building CXX object CMakeFiles/Dom.dir/parser.o
> Linking CXX executable Dom
> /usr/bin/ld: Undefined symbols:
> xercesc_2_7::DTDEntityDecl::serialize(xercesc_2_7::XSerializeEngine&)
> xercesc_2_7::XMLAttDefList::serialize(xercesc_2_7::XSerializeEngine&)
> xercesc_2_7::XMLEntityDecl::~XMLEntityDecl()
> xercesc_2_7::SAXParseException::SAXParseException(xercesc_2_7::SAXParseException
> const&)
> xercesc_2_7::SAXParseException::~SAXParseException()
> xercesc_2_7::XMemory::operator delete(void*)
> xercesc_2_7::DTDEntityDecl::getProtoType() const
> xercesc_2_7::DTDEntityDecl::isSerializable() const
> xercesc_2_7::XMLAttDefList::getProtoType() const
> xercesc_2_7::XMLAttDefList::isSerializable() const
> xercesc_2_7::PSVIItem::getActualValue() const
> typeinfo for xercesc_2_7::XMLEntityDecl
> typeinfo for xercesc_2_7::SAXParseException
> collect2: ld returned 1 exit status
> make[2]: *** [Dom] Error 1
> make[1]: *** [CMakeFiles/Dom.dir/all] Error 2
> make: *** [all] Error 2
>
> My FindXerces.cmake file is :
>
> #SET THE ROOT DIRECTORY WHERE XERCES-C++ IS INSTALLED
> SET(XERCES_ROOT_DIR /Developer/CPP/xerces-c-src_2_7_0)
>
> #DO NOT CHANGE
> SET(XERCES_LIBRARY_DIR ${XERCES_ROOT_DIR}/lib)
> SET(XERCES_INCLUDE_DIR ${XERCES_ROOT_DIR}/include)
> SET(XERCES_LINK_FLAGS -L${XERCES_LIBRARY_DIR})
> SET(XERCES_INC_FLAGS -I${XERCES_INCLUDE_DIR})
>
> INCLUDE_DIRECTORIES(${XERCES_INCLUDE_DIR})
> LINK_DIRECTORIES(${XERCES_LIBRARY_DIR})
> LINK_LIBRARIES(${XERCES_LINK_FLAGS})
> ADD_DEFINITIONS(${XERCES_INC_FLAGS})
>
> and my CMakeLists.txt file is :
>
> PROJECT(Dom)
> INCLUDE (FindXerces.cmake)
> SET(SRCS parser.cpp)
> ADD_Executable(Dom ${SRCS})

Hi Pierre,

In the documentation of the `LINK_LIBRARIES' command, it is specified that:
1. The libraries are linked with all targets defined in
*sub-directories*. In another words, it means that the ADD_EXECUTABLE
call in the main CMakeLists.txt file might not consider it.
2. The parameters are targets defined with ADD_EXECUTABLE or
ADD_LIBRARY. So I guess CMake should shiek.

By the way,:
1. the LINK_DIRECTORIES command is more or less deprecated, you should
use the TARGET_LINK_LIBRARIES command instead:
2. The way you search the library is very static. You should maybe use
the command FIND_LIBRARY and FIND_PATH instead. Here is a very simple
CMake module which uses these 2 commands:
http://www.cmake.org/cgi-bin/viewcvs.cgi/Modules/FindTIFF.cmake?rev=1.9&root=CMake&view=markup
You can then set the environment variables CMAKE_INCLUDE_PATH and
CMAKE_LIBRARY_PATH to provide to CMake another directories to look for
includes, respectively libraries so that everything is found
automagically.

PROJECT(Dom)
INCLUDE (FindXerces.cmake)
SET(SRCS parser.cpp)
INCLUDE_DIRECTORIES(${XERCES_INCLUDE_DIR})
ADD_DEFINITIONS(${XERCES_INC_FLAGS})
ADD_Executable(Dom ${SRCS})
TARGET_LINK_LIBRARIES(Dom ${XERCES_LIBRARY_DIR})

If you still have troubles, could you please submit the compilation
log with the variable CMAKE_VERBOSE_MAKEFILE set to true?
$ cmake -DCMAKE_VERBOSE_MAKEFILE=true
$ make  # thx

-- 
Tristan Carel
Music with dinner is an insult both to the cook and the violinist.
http://www.tristan-carel.com