Use C++20

Change-Id: I8e731978620bad60be1a8a2207e7a51b6e4f76fe
Reviewed-on: https://codereview.kdab.com/c/kdab/code_browser/+/141227
Reviewed-by: Steffen Hansen <steffen.hansen@kdab.com>

Author: Waqar144

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.1)
 project(codebrowser LANGUAGES CXX)
 
 include(GNUInstallDirs)
-set (CMAKE_CXX_STANDARD 11)
+set (CMAKE_CXX_STANDARD 20)
 
 add_subdirectory(generator)
 add_subdirectory(indexgenerator)

generator/CMakeLists.txt

@@ -28,7 +28,7 @@ endif()
 
 install(TARGETS codebrowser_generator RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 target_include_directories(codebrowser_generator SYSTEM PUBLIC ${CLANG_INCLUDE_DIRS})
-set_property(TARGET codebrowser_generator PROPERTY CXX_STANDARD 17)
+set_property(TARGET codebrowser_generator PROPERTY CXX_STANDARD 20)
 
 
 if (NOT APPLE AND NOT MSVC)

indexgenerator/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.1)
 project(codebrowser_indexgenerator)
 add_executable(codebrowser_indexgenerator indexer.cpp)
-set_property(TARGET codebrowser_indexgenerator PROPERTY CXX_STANDARD 14)
+set_property(TARGET codebrowser_indexgenerator PROPERTY CXX_STANDARD 20)
 install(TARGETS codebrowser_indexgenerator RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})