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137 lines
3.7 KiB
Markdown
137 lines
3.7 KiB
Markdown
# vcpkg_check_features
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The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_check_features.md).
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Check if one or more features are a part of a package installation.
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```cmake
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vcpkg_check_features(
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OUT_FEATURE_OPTIONS <out-var>
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[PREFIX <prefix>]
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[FEATURES
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[<feature-name> <feature-var>]...
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]
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[INVERTED_FEATURES
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[<feature-name> <feature-var>]...
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]
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)
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```
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The `<out-var>` should be set to `FEATURE_OPTIONS` by convention.
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`vcpkg_check_features()` will:
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- for each `<feature-name>` passed in `FEATURES`:
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- if the feature is set, add `-D<feature-var>=ON` to `<out-var>`,
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and set `<prefix>_<feature-var>` to ON.
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- if the feature is not set, add `-D<feature-var>=OFF` to `<out-var>`,
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and set `<prefix>_<feature-var>` to OFF.
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- for each `<feature-name>` passed in `INVERTED_FEATURES`:
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- if the feature is set, add `-D<feature-var>=OFF` to `<out-var>`,
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and set `<prefix>_<feature-var>` to OFF.
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- if the feature is not set, add `-D<feature-var>=ON` to `<out-var>`,
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and set `<prefix>_<feature-var>` to ON.
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If `<prefix>` is not passed, then the feature vars set are simply `<feature-var>`,
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not `_<feature-var>`.
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If `INVERTED_FEATURES` is not passed, then the `FEATURES` keyword is optional.
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This behavior is deprecated.
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If the same `<feature-var>` is passed multiple times,
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then `vcpkg_check_features` will cause a fatal error,
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since that is a bug.
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## Examples
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### Example 1: Regular features
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```cmake
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$ ./vcpkg install mimalloc[asm,secure]
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# ports/mimalloc/portfile.cmake
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vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
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FEATURES
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asm MI_SEE_ASM
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override MI_OVERRIDE
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secure MI_SECURE
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)
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vcpkg_cmake_configure(
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SOURCE_PATH "${SOURCE_PATH}"
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OPTIONS
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# Expands to "-DMI_SEE_ASM=ON;-DMI_OVERRIDE=OFF;-DMI_SECURE=ON"
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${FEATURE_OPTIONS}
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)
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```
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### Example 2: Inverted features
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```cmake
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$ ./vcpkg install cpprestsdk[websockets]
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# ports/cpprestsdk/portfile.cmake
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vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
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INVERTED_FEATURES
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brotli CPPREST_EXCLUDE_BROTLI
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websockets CPPREST_EXCLUDE_WEBSOCKETS
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)
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vcpkg_cmake_configure(
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SOURCE_PATH "${SOURCE_PATH}"
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OPTIONS
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# Expands to "-DCPPREST_EXCLUDE_BROTLI=ON;-DCPPREST_EXCLUDE_WEBSOCKETS=OFF"
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${FEATURE_OPTIONS}
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)
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```
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### Example 3: Set multiple options for same feature
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```cmake
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$ ./vcpkg install pcl[cuda]
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# ports/pcl/portfile.cmake
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vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
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FEATURES
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cuda WITH_CUDA
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cuda BUILD_CUDA
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cuda BUILD_GPU
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)
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vcpkg_cmake_configure(
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SOURCE_PATH "${SOURCE_PATH}"
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OPTIONS
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# Expands to "-DWITH_CUDA=ON;-DBUILD_CUDA=ON;-DBUILD_GPU=ON"
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${FEATURE_OPTIONS}
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)
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```
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### Example 4: Use regular and inverted features
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```cmake
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$ ./vcpkg install rocksdb[tbb]
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# ports/rocksdb/portfile.cmake
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vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
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FEATURES
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tbb WITH_TBB
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INVERTED_FEATURES
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tbb ROCKSDB_IGNORE_PACKAGE_TBB
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)
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vcpkg_cmake_configure(
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SOURCE_PATH "${SOURCE_PATH}"
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OPTIONS
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# Expands to "-DWITH_TBB=ON;-DROCKSDB_IGNORE_PACKAGE_TBB=OFF"
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${FEATURE_OPTIONS}
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)
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```
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## Examples in portfiles
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* [cpprestsdk](https://github.com/microsoft/vcpkg/blob/master/ports/cpprestsdk/portfile.cmake)
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* [pcl](https://github.com/microsoft/vcpkg/blob/master/ports/pcl/portfile.cmake)
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* [rocksdb](https://github.com/microsoft/vcpkg/blob/master/ports/rocksdb/portfile.cmake)
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## Source
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[scripts/cmake/vcpkg\_check\_features.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_check_features.cmake)
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