Android: Detect and save the API level
Store the Android API level in CMAKE_SYSTEM_VERSION. If it is not provided by the user, initialize it from CMAKE_ANDROID_API or fall back to finding the latest available in the NDK.
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@ -42,7 +42,55 @@ if(NOT CMAKE_ANDROID_NDK)
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message(FATAL_ERROR "Android: The NDK root directory was not found.")
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endif()
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# Select an API.
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if(CMAKE_SYSTEM_VERSION)
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set(_ANDROID_API_VAR CMAKE_SYSTEM_VERSION)
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elseif(CMAKE_ANDROID_API)
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set(CMAKE_SYSTEM_VERSION "${CMAKE_ANDROID_API}")
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set(_ANDROID_API_VAR CMAKE_ANDROID_API)
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endif()
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if(CMAKE_SYSTEM_VERSION)
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if(CMAKE_ANDROID_API AND NOT "x${CMAKE_ANDROID_API}" STREQUAL "x${CMAKE_SYSTEM_VERSION}")
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message(FATAL_ERROR
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"Android: The API specified by CMAKE_ANDROID_API='${CMAKE_ANDROID_API}' is not consistent with CMAKE_SYSTEM_VERSION='${CMAKE_SYSTEM_VERSION}'."
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)
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endif()
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if(CMAKE_ANDROID_NDK AND NOT IS_DIRECTORY "${CMAKE_ANDROID_NDK}/platforms/android-${CMAKE_SYSTEM_VERSION}")
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message(FATAL_ERROR
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"Android: The API specified by ${_ANDROID_API_VAR}='${${_ANDROID_API_VAR}}' does not exist in the NDK. "
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"The directory:\n"
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" ${CMAKE_ANDROID_NDK}/platforms/android-${CMAKE_SYSTEM_VERSION}\n"
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"does not exist."
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)
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endif()
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elseif(CMAKE_ANDROID_NDK)
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file(GLOB _ANDROID_APIS_1 RELATIVE "${CMAKE_ANDROID_NDK}/platforms" "${CMAKE_ANDROID_NDK}/platforms/android-[0-9]")
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file(GLOB _ANDROID_APIS_2 RELATIVE "${CMAKE_ANDROID_NDK}/platforms" "${CMAKE_ANDROID_NDK}/platforms/android-[0-9][0-9]")
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list(SORT _ANDROID_APIS_1)
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list(SORT _ANDROID_APIS_2)
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set(_ANDROID_APIS ${_ANDROID_APIS_1} ${_ANDROID_APIS_2})
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unset(_ANDROID_APIS_1)
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unset(_ANDROID_APIS_2)
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if(_ANDROID_APIS STREQUAL "")
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message(FATAL_ERROR
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"Android: No APIs found in the NDK. No\n"
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" ${CMAKE_ANDROID_NDK}/platforms/android-*\n"
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"directories exist."
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)
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endif()
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string(REPLACE "android-" "" _ANDROID_APIS "${_ANDROID_APIS}")
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list(REVERSE _ANDROID_APIS)
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list(GET _ANDROID_APIS 0 CMAKE_SYSTEM_VERSION)
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unset(_ANDROID_APIS)
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endif()
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if(NOT CMAKE_SYSTEM_VERSION MATCHES "^[0-9]+$")
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message(FATAL_ERROR "Android: The API specified by CMAKE_SYSTEM_VERSION='${CMAKE_SYSTEM_VERSION}' is not an integer.")
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endif()
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# Save the Android-specific information in CMakeSystem.cmake.
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set(CMAKE_SYSTEM_CUSTOM_CODE "
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set(CMAKE_ANDROID_NDK \"${CMAKE_ANDROID_NDK}\")
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")
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# Report the chosen architecture.
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message(STATUS "Android: Targeting API '${CMAKE_SYSTEM_VERSION}'")
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