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88 lines
4.0 KiB
Markdown
88 lines
4.0 KiB
Markdown
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# Example (JKQTPlotter): CMake FetchContent Example {#JKQTCMakeFetchContentExample}
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This project (see [`cmake_fetchcontent_example`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/cmake_fetchcontent_example) demonstrates how to link against JKQTPlotter using CMake's [FetchContent-API](https://cmake.org/cmake/help/latest/module/FetchContent.html). Also have a look at [this blog post](https://www.foonathan.net/2022/06/cmake-fetchcontent/) for a detailed explanation. See https://jkriege2.github.io/JKQtPlotter/page_buildinstructions__c_m_a_k_e.html for details on how to build JKQTPlotter with CMake
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This example uses very simple code, which simply displays a plotter and shows some data. The important part of this example is the ´CMakeLists.txt`-file:
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```
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# set minimum required CMake-Version
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cmake_minimum_required(VERSION 3.23)
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# set Project name
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project(simpletest_cmake LANGUAGES CXX)
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# some basic configurations
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set(CMAKE_AUTOMOC ON)
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set(CMAKE_INCLUDE_CURRENT_DIR ON)
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# Configure project for usage of Qt5/Qt6
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find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Gui Widgets PrintSupport Svg Xml OpenGl REQUIRED)
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find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Widgets PrintSupport Svg Xml OpenGL REQUIRED)
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# include JKQTPlotter via FetchContent-API:
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# ... first load the FetchContent-API:
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include(FetchContent) # once in the project to include the module
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# ... now declare JKQTPlotter5/6
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FetchContent_Declare(JKQTPlotter${QT_VERSION_MAJOR}
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GIT_REPOSITORY https://github.com/jkriege2/JKQtPlotter.git
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# GIT_TAG v5.0.0)
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# ... finally make JKQTPlotter5/6 available
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FetchContent_MakeAvailable(JKQTPlotter${QT_VERSION_MAJOR})
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# For Visual Studio, we need to set some additional compiler options
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if(MSVC)
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add_compile_options(/EHsc)
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# To enable M_PI, M_E,...
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add_definitions(/D_USE_MATH_DEFINES)
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# To Prevent Errors with min() and max()
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add_definitions(/DNOMINMAX)
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# To fix error: C2338: va_start argument must not
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# have reference type and must not be parenthesized
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add_definitions(/D_CRT_NO_VA_START_VALIDATION)
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endif()
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# add the example executable
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add_executable(${PROJECT_NAME} WIN32 simpletest.cpp)
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# ... link against Qt5/6 and JKQTPlotterLib
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# (you could use JKQTPlotterSharedLib if you don't want to link againast the
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# static version, but against the shared/DLL version).
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target_link_libraries(${PROJECT_NAME} PUBLIC Qt${QT_VERSION_MAJOR}::Core Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Gui Qt${QT_VERSION_MAJOR}::PrintSupport Qt${QT_VERSION_MAJOR}::Svg Qt${QT_VERSION_MAJOR}::Xml)
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# ... link against JKQTPlotter: As the Targets contain the Qt-Version-Number in their names, we can
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# link against 'JKQTPlotter${QT_VERSION_MAJOR}::JKQTPlotter${QT_VERSION_MAJOR}' and it works
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# for Qt5 AND Qt6 ...
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# if you have a speific Qt-Version, you can also write e.g. 'JKQTPlotter6::JKQTPlotter6'
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target_link_libraries(${PROJECT_NAME} PUBLIC JKQTPlotter${QT_VERSION_MAJOR}::JKQTPlotter${QT_VERSION_MAJOR})
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# Installation
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install(TARGETS ${PROJECT_NAME}
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RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
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)
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```
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The important steps here are
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```
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include(FetchContent) # once in the project to include the module
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# ... now declare JKQTPlotter5/6
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FetchContent_Declare(JKQTPlotter${QT_VERSION_MAJOR}
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GIT_REPOSITORY https://github.com/jkriege2/JKQtPlotter.git
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# GIT_TAG v5.0.0)
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# ... finally make JKQTPlotter5/6 available
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FetchContent_MakeAvailable(JKQTPlotter${QT_VERSION_MAJOR})
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```
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where JKQTPlotter is first declared to the FetchContent-API and then loaded.
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To build this example, you first need to make a subdirectory `build` and then call CMake form that subdirectory:
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```.sh
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$ mkdir build
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$ cd build
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$ cmake .. -G "<GENERATOR>" "-DCMAKE_PREFIX_PATH=<path_to_your_qt_sources>"
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cmake --build . --config "Debug"
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```
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In the configure step above, you need to specify the directory `<path_to_your_qt_sources>` of yout Qt installation and the `<GENERATOR>` appropriate for you use-case.
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