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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 2ac06241d277c969c0dee0f40fb4f00971a4d7f7)

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

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a -Wshadow
prog.cc:6:9: warning: declaration shadows a variable in the global namespace [-Wshadow]
    int global_or_local; // warning C4459
        ^
prog.cc:3:5: note: previous declaration is here
int global_or_local = 1;
    ^
1 warning generated.
Exit Code:
0