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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 9087209314caafed4b232d4a66287f2d16054ad3)

Options
Warnings
Boost 1.73.0
C++2a
no pedantic

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a 
prog.cc:15:20: error: cannot pass non-trivial object of type 'struct S' to variadic function; expected type from format string was 'int' [-Wnon-pod-varargs]
    printf("%i\n", s); // warning C4840 : non-portable use of class 'main::S'
            ~~     ^
1 error generated.
Exit Code:
1