RealSR-NCNN-Android

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set(TMP_DIR ${PROJECT_BINARY_DIR}/tmp)
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set(DetectionSample_DIR ${TOP_DIR}/cmake/DetectionSample)
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set(has_filesystem_cpp
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"#include <filesystem>
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int main()
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{
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    std::filesystem::path hasFS(\"./\")\;
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    return 0\;
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}
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")
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if(NOT EXISTS ${DetectionSample_DIR}/has_filesystem.cpp)
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    file(MAKE_DIRECTORY ${DetectionSample_DIR})
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    file(WRITE ${DetectionSample_DIR}/has_filesystem.cpp ${has_filesystem_cpp})
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endif()
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# check std::filesystem
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if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
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    try_compile(HAS_FILESYSTEM
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        ${TMP_DIR}
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        ${DetectionSample_DIR}/has_filesystem.cpp
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        CMAKE_FLAGS -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=ON -DLINK_LIBRARIES=stdc++fs
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        OUTPUT_VARIABLE HAS_FILESYSTEM_MSG
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    )
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else()
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    try_compile(HAS_FILESYSTEM
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        ${TMP_DIR}
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        ${DetectionSample_DIR}/has_filesystem.cpp
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        CMAKE_FLAGS -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=ON
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        OUTPUT_VARIABLE HAS_FILESYSTEM_MSG
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    )
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endif()
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