[英]How to link multiple libraries using CMake
I have some code to do with DCMTK.我有一些与 DCMTK 相关的代码。 I can successfully build and run it if I use g++ from the command line.
如果我从命令行使用 g++,我可以成功构建并运行它。 This is the code:
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;
}
This is the build command: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
I want to make a CMakeLists.txt to build it in Kdevelop.我想制作一个 CMakeLists.txt 以在 Kdevelop 中构建它。 This is what I currently have:
这是我目前拥有的:
# 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 )
But when I build it, it has this error: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'
Can you help me to fix the error?你能帮我解决这个错误吗? Thank you.
谢谢你。
It looks like you expect the find_library
call to populate the variable DINIFTI_DCMTK_LIB
with 3 separate libraries.看起来您希望
find_library
调用使用 3 个单独的库填充变量DINIFTI_DCMTK_LIB
。
This isn't how find_library
works.这不是
find_library
工作方式。 The different arguments after NAMES
represent all the various names a single library could be called. NAMES
之后的不同参数代表单个库可以调用的所有不同名称。 This allows the command to work cross-platform, where the same library could be called different things on different platforms.这允许命令跨平台工作,其中相同的库可以在不同的平台上被称为不同的东西。
A minor issue is that you probably should prefer using PATHS
instead of HINTS
here.一个小问题是您可能更喜欢在此处使用
PATHS
而不是HINTS
。 Form the docs:形成文档:
... the
HINTS
option ... should be paths computed by system introspection, such as a hint provided by the location of another item already found....
HINTS
选项 ... 应该是由系统自省计算的路径,例如由已找到的另一个项目的位置提供的提示。 Hard-coded guesses should be specified with thePATHS
option.硬编码的猜测应该用
PATHS
选项指定。
I imagine you want something more like:我想你想要更像:
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)
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