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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 344a3d0bc0fb0868b519c3342b4982d6121eece3)

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:5:9: warning: unused variable 'c' [-Wunused-variable]
   char c = 128;   // C4309
        ^
prog.cc:5:13: warning: implicit conversion from 'int' to 'char' changes value from 128 to -128 [-Wconstant-conversion]
   char c = 128;   // C4309
        ~   ^~~
2 warnings generated.
Exit Code:
0