Improve build variables documentation
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@ -99,6 +99,13 @@ the location of libraries and include directories directly:
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* `dependency_STATIC_INCLUDE_DIR`: specifies the locations of the additional
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* `dependency_STATIC_INCLUDE_DIR`: specifies the locations of the additional
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include directories required for using the static version of the *dependency*
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include directories required for using the static version of the *dependency*
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*Note about Qt*: Qt modules are always configured using the CMake packages via
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`find_package`. So using the variables described above to specify a custom location
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does not work. Instead, the variables `CMAKE_FIND_ROOT_PATH` or `CMAKE_PREFIX_PATH`
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can be used to specify the install prefix of the Qt build to use. Set `QT_LINKAGE`
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to `STATIC` if it is a static build of Qt.
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##### Examples
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Example of passing location of dynamic `iconv` and `zlib` to CMake:
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Example of passing location of dynamic `iconv` and `zlib` to CMake:
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```
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```
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/opt/osxcross/bin/x86_64-apple-darwin15-cmake \
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/opt/osxcross/bin/x86_64-apple-darwin15-cmake \
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@ -109,10 +116,25 @@ Example of passing location of dynamic `iconv` and `zlib` to CMake:
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...
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...
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```
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```
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*Note about Qt*: Qt modules must be located via `find_package`. So using the variables
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Here's an example of passing the location of the Android SDK/NDK to compile for Android.
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described above to specify a custom location does not work. Instead, the
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This time the `iconv` library is located by specifying its install prefix via
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variable `CMAKE_PREFIX_PATH` can be used to specify the install prefix of the
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`CMAKE_FIND_ROOT_PATH`. The include directories are not automatically added for that
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Qt build to use. Set `QT_LINKAGE` to `STATIC` if it is a static build of Qt.
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library, so this must still be done manually:
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```
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_android_arch=arm64-v8a
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cmake \
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-DCMAKE_SYSTEM_NAME=Android \
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-DCMAKE_SYSTEM_VERSION=21 \
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-DCMAKE_ANDROID_ARCH_ABI=$_android_arch \
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-DCMAKE_ANDROID_NDK=/opt/android-ndk \
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-DCMAKE_ANDROID_SDK=/opt/android-sdk \
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-DCMAKE_ANDROID_STL_TYPE=gnustl_shared \
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-DCMAKE_INSTALL_PREFIX=/opt/android-libs/$_android_arch \
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-DCMAKE_FIND_ROOT_PATH="/opt/android-ndk/sysroot;/opt/android-libs/$_android_arch" \
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-Diconv_DYNAMIC_INCLUDE_DIR="/opt/android-libs/$_android_arch/include" \
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-Diconv_STATIC_INCLUDE_DIR="/opt/android-libs/$_android_arch/include" \
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...
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```
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#### Windows specific
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#### Windows specific
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* `USE_NATIVE_FILE_BUFFER=ON/OFF`: use native function to open file streams
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* `USE_NATIVE_FILE_BUFFER=ON/OFF`: use native function to open file streams
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