问题
I'm new in programming. And for my study project I need to install a third-party library for using with CMake (GitHub project).
I use Arch OS on my PC. Usually I build all non-repository packages in: ~/aur. CMake version is 3.17.
Then I try to build a library according to the instructions:
...
cmake --config Debug "-DCMAKE_BUILD_TYPE=Debug" ..
it makes me an error:
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
PNG_INCLUDE_DIR
used as include directory in directory /home/wizki/aur/P0267_RefImpl/P0267_RefImpl/Tests
-- Generating done
CMake Generate step failed. Build files cannot be regenerated correctly.
If I ignore this error and build this library using:
cmake --build .
The building is succesful, but durin my project building I have an error:
CMake Error at CMakeLists.txt:15 (find_package):
By not providing "Findio2d.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "io2d", but
CMake did not find one.
Could not find a package configuration file provided by "io2d" with any of
the following names:
io2dConfig.cmake
io2d-config.cmake
Add the installation prefix of "io2d" to CMAKE_PREFIX_PATH or set
"io2d_DIR" to a directory containing one of the above files. If "io2d"
provides a separate development package or SDK, be sure it has been
installed.
-- Configuring incomplete, errors occurred!
After a web search I've tried this solution: Daniweb. libpng and zlib packages are installed; FindPNG.cmake exists in /usr/share/cmake-3.17/Modules/. But my $CMAKE_INCLUDE_PATH and $CMAKE_LIBRARY_PATH are empty:
[wizki@evix Debug]$ echo $CMAKE_INCLUDE_PATH
[wizki@evix Debug]$ echo $CMAKE_LIBRARY_PATH
I've tried to search in FindPNG.cmake for paths, but no result. From CMake wiki I suppose that one of the library path is /usr/lib. I've tried to build a library inside, but I have a same issue.
What can I try next?
回答1:
Assuming you are studying for the C++ Nanodegree Project on Udacity. I was stuck on the same issue and I found out that during the installation of IO2D after you execute the following command in the terminal
cmake --build .
execute the following command
sudo make install
this will copy the necessary files at places where Cmake can find them.
Therefore, the complete process looks like this
git clone --recurse-submodules https://github.com/cpp-io2d/P0267_RefImpl
cd P0267_RefImpl
mkdir Debug
cd Debug
cmake --config Debug "-DCMAKE_BUILD_TYPE=Debug" ..
cmake --build .
sudo make install
I found the solution here - https://github.com/udacity/CppND-Route-Planning-Project/issues/1#issuecomment-569472612
PS: As you are new to programming I would like to share a tip that many times other people also have the same issue and it is easier to find a solution in the "Issues" tab of a GitHub repo.
来源：https://stackoverflow.com/questions/61025954/cmake-third-party-library-installation