Update cmake

Auto detect filesystem

.gitignore

@@ -14,6 +14,7 @@ Build
 build
 install
 ThirdParty
+DetectionSample
 settings.ini
 logo.rc
 *.aps

CMakeLists.txt

@@ -30,16 +30,28 @@ if(WIN32)
     set(CMAKE_INSTALL_PREFIX ${TOP_DIR}/install)
 endif(WIN32)
 
+include(${TOP_DIR}/cmake/Detection.cmake)
+
 option(Build_GUI "Build GUI or not" OFF)
 option(Build_CLI "Build CLI or not" ON)
 option(Build_VapourSynth_plugin "Build Anime4KCPP for VapourSynth plugin or not" OFF)
 option(Build_AviSynthPlus_plugin "Build Anime4KCPP for AviSynthPlus plugin or not" OFF)
 option(Build_C_wrapper "Build C wrapper of Anime4KCPP or not" OFF)
 option(Build_C_wrapper_with_core "Build C wrapper and core in one file" OFF)
 option(Built_in_kernel "Built-in kernel or not" ON)
-option(Use_Boost_filesystem "Use filesystem lib from boost instead of STL" OFF)
 option(Use_TBB "Use TBB for parallel processing" OFF)
 
+if(HAS_FILESYSTEM)
+    option(Use_Boost_filesystem "Use filesystem lib from boost instead of STL" OFF)
+else()
+    message (
+        STATUS "Failed to complie has_filesystem.cpp, will use boost::filesystem instead of std::filesyste\n"
+        "Error message:\n"
+        ${HAS_FILESYSTEM_MSG}
+    )
+    option(Use_Boost_filesystem "Use filesystem lib from boost instead of STL" ON)
+endif()
+
 if(WIN32)
     set(OpenCL_Provider "Intel" CACHE STRING "one of Intel;Nvidia;AMD;Auto")
 else()

cmake/Detection.cmake

@@ -0,0 +1,35 @@
+set(TMP_DIR ${PROJECT_BINARY_DIR}/tmp)
+set(DetectionSample_DIR ${TOP_DIR}/cmake/DetectionSample)
+
+if(NOT EXISTS ${DetectionSample_DIR}/has_filesystem.cpp)
+    file(MAKE_DIRECTORY ${DetectionSample_DIR})
+    file(TOUCH ${DetectionSample_DIR}/has_filesystem.cpp)
+    file(WRITE ${DetectionSample_DIR}/has_filesystem.cpp 
+"#include <filesystem>
+
+int main()
+{
+    std::filesystem::path hasFS(\"./\");
+    return 0;
+}
+")
+
+    # check std::filesystem
+    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+        try_compile(HAS_FILESYSTEM
+            ${TMP_DIR}
+            ${DetectionSample_DIR}/has_filesystem.cpp
+            CMAKE_FLAGS -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            LINK_LIBRARIES stdc++fs
+            OUTPUT_VARIABLE HAS_FILESYSTEM_MSG
+        )
+    else()
+        try_compile(HAS_FILESYSTEM
+            ${TMP_DIR}
+            ${DetectionSample_DIR}/has_filesystem.cpp
+            CMAKE_FLAGS -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=ON
+            OUTPUT_VARIABLE HAS_FILESYSTEM_MSG
+        )
+    endif()
+
+endif()