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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:18:5: warning: macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined]
#if DEFINED_TEST  // C5105
    ^
prog.cc:9:22: note: expanded from macro 'DEFINED_TEST'
#define DEFINED_TEST defined TEST
                     ^
1 warning generated.

TEST not defined
Exit Code:
0