如何使用CMake链接多个库

Question

我有一些与DCMTK有关的代码.如果我从命令行使用g ++,我可以成功构建并运行它.这是代码:

#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/dctk.h"

int main()
{
DcmFileFormat fileformat;
OFCondition status = fileformat.loadFile("test.dcm");
if (status.good())
{
   OFString patientsName;
   if (fileformat.getDataset()->findAndGetOFString(DCM_PatientsName, patientsName).good())
   {
      cout << "Patient's Name: " << patientsName << endl;
   } else
     cerr << "Error: cannot access Patient's Name!" << endl;
} else
cerr << "Error: cannot read DICOM file (" << status.text() << ")" << endl;
return 0;
}

这是构建命令:

g++ testeapp.cxx -DHAVE_CONFIG_H -I/path_to_dcmtk/include -L/path_to_dcmtk/lib -pthread -ldcmdata -lz -loflog -lofstd -o main

我想制作一个CMakeLists.txt来在Kdevelop中构建它.这就是我目前拥有的:

    # Configure toplevel directories
    SET( PREFIX     ${CMAKE_INSTALL_PREFIX} CACHE PATH "Top level.")
    SET( INCLUDEDIR ${PREFIX}/include       CACHE PATH "Include files.")
    SET( LIBDIR     ${PREFIX}/lib           CACHE PATH "Libraries.")
    FIND_PACKAGE ( Threads REQUIRED )
    # Configure DCMTK
    FIND_PATH( DINIFTI_DCMTK_INCLUDE dcmtk
               PATHS ${INCLUDEDIR}
               PATH_SUFFIXES dcmtk
               DOC "Path to the DCMTK headers." )
    FIND_LIBRARY(DINIFTI_DCMTK_LIB NAMES dcmdata ofstd oflog 
                 HINTS ${LIBDIR} ${LIBDIR})
TARGET_LINK_LIBRARIES( dinifti ${DINIFTI_DCMTK_LIB}
                               ${DINIFTI_ZNZ_LIB}
                               ${CMAKE_THREAD_LIBS_INIT}
                               z )             

但是当我构建它时,它有这个错误:

/usr/local/lib/libdcmdata.a(dcfilefo.o): In function `DcmFileFormat::remove(DcmItem*)':
dcfilefo.cc:(.text+0x1788): undefined reference to `log4cplus::Logger::forcedLog(int, OFString const&, char const*, int, char const*) const'

你能帮我修一下这个错误吗？谢谢.

Answer 1

看起来您希望find_library调用DINIFTI_DCMTK_LIB使用3个单独的库填充变量.

这不是多么find_library有效.不同的参数后,NAMES表示所有的各种名称的单个磁带库可以被调用.这允许命令跨平台工作,其中相同的库可以在不同平台上被称为不同的东西.

一个小问题是你可能更喜欢使用PATHS而不是在HINTS这里.形成文档:

... HINTS选项...应该是系统内省计算的路径,例如由已找到的另一个项目的位置提供的提示.应使用该PATHS选项指定硬编码猜测.

我想你想要更像的东西:

find_library(DINIFTI_DCMTK_LIB NAMES dcmdata PATHS ${LIBDIR})
find_library(OFSTD_LIB NAMES ofstd PATHS ${LIBDIR})
find_library(OFLOG_LIB NAMES oflog PATHS ${LIBDIR})
target_link_libraries(dinifti ${DINIFTI_DCMTK_LIB}
                              ${OFLOG_LIB}
                              ${OFSTD_LIB}
                              ${DINIFTI_ZNZ_LIB}
                              ${CMAKE_THREAD_LIBS_INIT}
                              z)