CMake: Use std c++ 11 or 17

CMakeLists.txt

@@ -4,7 +4,6 @@ project(FaceRecognizer)
 
 SET(CMAKE_INCLUDE_CURRENT_DIR ON)
 SET(CMAKE_VERBOSE_MAKEFILE ON)
-set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)
 
@@ -43,6 +42,9 @@ if(ANDROID AND (Qt${QT_VERSION_MAJOR}_VERSION VERSION_LESS 6.0.0))
 endif()
 if(QT_VERSION_MAJOR GREATER_EQUAL 6)
     LIST(APPEND QT_COMPONENTS MultimediaWidgets Core5Compat)
+    set(CMAKE_CXX_STANDARD 17)
+else()
+    set(CMAKE_CXX_STANDARD 11)
 endif()
 find_package(Qt${QT_VERSION_MAJOR} COMPONENTS ${QT_COMPONENTS})
 message("QT_VERSION:${Qt${QT_VERSION_MAJOR}_VERSION}")
@@ -67,13 +69,10 @@ IF(MSVC)
     add_compile_options("$<$<C_COMPILER_ID:MSVC>:/utf-8>")
     add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
 ENDIF(MSVC)
-IF(MINGW)
-    add_compile_options("-std=c++0x")
-ENDIF()
 IF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
     OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
 
-    add_compile_options(-std=c++0x -Wno-sign-compare -Wno-unused-parameter)
+    add_compile_options(-Wno-sign-compare -Wno-unused-parameter)
 
     if ("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
         add_compile_options(-g -ggdb)