mapnik/docs/cmake-usage.md

Usage with CMake

Build

First clone mapnik from github and initialize submodules

git clone https://github.com/mapnik/mapnik.git
cd mapnik
git submodule update --init

Make sure that all dependencies are installed.

All available cmake options are listed at the top of CMakeLists.txt. Pass your options while configuring e.g.: cmake -DBUILD_DEMO_VIEWER=OFF .. to disable the build of the demo viewer application.

To quickstart open a console in the root mapnik dir and execute the following commands: (Pass all options and dependency dirs after -DBUILD_TEST=OFF)

> cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DBUILD_TEST=OFF
> cmake --build build --target install

Usage

To use Mapnik in your project add the following lines to your CMakeLists.tzt.

find_package(mapnik CONFIG REQUIRED)
[...]
target_link_libraries(mytarget ... mapnik::core mapnik::mapnik)

All mapnik executables and targets are exported within mapnikTargets.cmake.

The plugin dir is available in the variable MAPNIK_PLUGINS_DIR. The font path is is available in the variable MAPNIK_FONTS_DIR.

Recommendations

If you target a specific platform, it is recommended to create a toolchain file and set all the options and library path that you would normally set via cmd line options. If you are using a recent cmake version (>=3.20), it is recommended to use a CMakePreset instead. https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html

CMakePreset example

If you are using CMakePresets and need to add vcpkg integration, just create a CMakeUserPresets.json file beside `CMakePresets.json. This could look like this:

{
    "version": 2,
    "cmakeMinimumRequired": {
        "major": 3,
        "minor": 20,
        "patch": 0
    },
    "configurePresets": [
        {
            "name": "vcpkg-x64-win-debug",
            "inherits": "windows-default-debug",
            "cacheVariables": {
                "CMAKE_TOOLCHAIN_FILE": "<path-to-vcpkg>/scripts/buildsystems/vcpkg.cmake",
                "ADDITIONAL_LIBARIES_PATHS":"<path-to-vcpkg>/installed/x64-windows/debug/bin"
            }
        },
        {
            "name": "vcpkg-x64-win-release",
            "inherits": "windows-default-release",
            "cacheVariables": {
                "CMAKE_TOOLCHAIN_FILE": "<path-to-vcpkg>/scripts/buildsystems/vcpkg.cmake",
                "ADDITIONAL_LIBARIES_PATHS":"<path-to-vcpkg>/installed/x64-windows/bin"
            }
        }
    ]
}

If your libraries are not in the global search paths, you could add a own CMakeUserPresets.json with

{
    "version": 2,
    "cmakeMinimumRequired": {
        "major": 3,
        "minor": 20,
        "patch": 0
    },
    "configurePresets": [
        {
            "name": "linux-clang-debug-own",
            "inherits": "linux-clang-debug",
            "cacheVariables": {
                "WebP_DIR": "/home/myuser/webp/cmake",
                "USE_CAIRO": "OFF",
                "CMAKE_INSTALL_PREFIX": "${sourceDir}/install"
            }
        }
    ]
}