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Language

C++

Compiler

gcc HEAD 11.0.0 20200917 (experimental)

Options
Warnings
Boost 1.73.0
C++2a
no pedantic
Raw compiler options
-Wconversion

$ g++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/gcc-head/include -std=c++2a -Wconversion
prog.cc: In function 'int main()':
prog.cc:5:13: warning: conversion from 'int' to 'char' changes value from '128' to ''\37777777600'' [-Wconversion]
    5 |    char c = 128;   // C4309
      |             ^~~
prog.cc:5:9: warning: unused variable 'c' [-Wunused-variable]
    5 |    char c = 128;   // C4309
      |         ^
Exit Code:
0