Build issue on MSVC 2019

[ank-007]

I added

cmake_minimum_required(VERSION 3.21)
project(your_awesome_app LANGUAGES CXX VERSION 1.0)

# --------------------------------------------------------------------------------------------------------
# Create executable
# --------------------------------------------------------------------------------------------------------

add_executable(${PROJECT_NAME} "main.cpp")
target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_20)
set_target_properties(${PROJECT_NAME} PROPERTIES CXX_STANDARD 20 CXX_EXTENSIONS OFF CXX_STANDARD_REQUIRED ON)

# --------------------------------------------------------------------------------------------------------
# Link libraries
# --------------------------------------------------------------------------------------------------------

include(FetchContent)

FetchContent_Declare(
    saucer 
    GIT_REPOSITORY "https://github.com/saucer/saucer" 
    GIT_TAG v2.1.1
)

FetchContent_MakeAvailable(saucer)

target_link_libraries(${PROJECT_NAME} PRIVATE saucer::saucer)

in my cmakelist.txt and ran cmake after that when I try to build , I am getting these errors

C5030: attribute 'sc::thread_safe' is not recognized
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(22): error C2676: binary '==': 'const saucer::window_event' does not define this operator or a conversion to a type acceptable to the predefined operator
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(82): note: see reference to function template instantiation 'auto &ereignis::manager<ereignis::event<saucer::window_event::resize,void (int,int)>,ereignis::event<saucer::window_event::maximize,void (bool)>,ereignis::event<saucer::window_event::minimize,void (bool)>,ereignis::event<saucer::window_event::focus,void (bool)>,ereignis::event<saucer::window_event::closed,void (void)>,ereignis::event<saucer::window_event::close,bool (void)>>::at<saucer::web_event::load_finished,0>(void)' being compiled
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\saucer-src\src\webview.webview2.cpp(403): note: see reference to function template instantiation 'auto ereignis::manager<ereignis::event<saucer::window_event::resize,void (int,int)>,ereignis::event<saucer::window_event::maximize,void (bool)>,ereignis::event<saucer::window_event::minimize,void (bool)>,ereignis::event<saucer::window_event::focus,void (bool)>,ereignis::event<saucer::window_event::closed,void (void)>,ereignis::event<saucer::window_event::close,bool (void)>>::type<saucer::web_event::load_finished,0>(void)' being compiled
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\saucer-src\include\saucer\window.hpp(121): note: see reference to alias template instantiation 'ereignis::manager<ereignis::event<saucer::window_event::resize,void (int,int)>,ereignis::event<saucer::window_event::maximize,void (bool)>,ereignis::event<saucer::window_event::minimize,void (bool)>,ereignis::event<saucer::window_event::focus,void (bool)>,ereignis::event<saucer::window_event::closed,void (void)>,ereignis::event<saucer::window_event::close,bool (void)>>::type_t<saucer::web_event::load_finished>' being compiled
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(22): error C2440: '==': cannot convert from 'saucer::web_event' to 'saucer::window_event'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(22): note: Conversion to enumeration type requires an explicit cast (static_cast, C-style cast or function-style cast)
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C2182: '<template-parameter>': illegal use of type 'void'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): note: see reference to function template instantiation 'auto &ereignis::manager<ereignis::event<saucer::window_event::resize,void (int,int)>,ereignis::event<saucer::window_event::maximize,void (bool)>,ereignis::event<saucer::window_event::minimize,void (bool)>,ereignis::event<saucer::window_event::focus,void (bool)>,ereignis::event<saucer::window_event::closed,void (void)>,ereignis::event<saucer::window_event::close,bool (void)>>::at<saucer::web_event::load_finished,6>(void)' being compiled
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3313: 'return expression': variable cannot have the type 'auto &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'int &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::close,bool (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'int &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::close,bool (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'int' to 'ereignis::event<saucer::window_event::close,bool (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'ereignis::event<saucer::window_event::close,bool (void)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::closed,void (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'ereignis::event<saucer::window_event::close,bool (void)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::closed,void (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'ereignis::event<saucer::window_event::close,bool (void)>' to 'ereignis::event<saucer::window_event::closed,void (void)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'ereignis::event<saucer::window_event::closed,void (void)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::focus,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'ereignis::event<saucer::window_event::closed,void (void)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::focus,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'ereignis::event<saucer::window_event::closed,void (void)>' to 'ereignis::event<saucer::window_event::focus,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'ereignis::event<saucer::window_event::focus,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::minimize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'ereignis::event<saucer::window_event::focus,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::minimize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'ereignis::event<saucer::window_event::focus,void (bool)>' to 'ereignis::event<saucer::window_event::minimize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'ereignis::event<saucer::window_event::minimize,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::maximize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'ereignis::event<saucer::window_event::minimize,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::maximize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'ereignis::event<saucer::window_event::minimize,void (bool)>' to 'ereignis::event<saucer::window_event::maximize,void (bool)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(13): error C3487: 'ereignis::event<saucer::window_event::maximize,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::resize,void (int,int)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C3487: 'ereignis::event<saucer::window_event::maximize,void (bool)> &': all return expressions must deduce to the same type: previously it was 'ereignis::event<saucer::window_event::resize,void (int,int)> &'
C:\Users\shash\OneDrive\Documents\build-webViewSample2-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\_deps\ereignis-src\include\ereignis\manager.inl(28): error C2440: 'return': cannot convert from 'ereignis::event<saucer::window_event::maximize,void (bool)>' to 'ereignis::event<saucer::window_event::resize,void (int,int)> &'
ninja: build stopped: subcommand failed.

why? can you please help? @Curve

[Curve]

You need a newer compiler, as stated in the documentation, saucer needs a recent compiler (/ toolchain) especially for MSVC because it had several defects that impacted saucer.

You're still using MSVC 2019, please upgrade to MSVC 2022 with Toolset Version at least >= 14.3

Edit: Also please use GitHub issues for this, it doesn't quite fit Discussions

[ank-007]

okayyy. Thank you for the assistance :)

[Curve]

okayyy. Thank you for the assistance :)

No Problem ^^