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Language

C++

Compiler

gcc HEAD 13.0.0 20220521 (experimental)

Options
Warnings
Don't Use Boost
C++17
-pedantic

$ g++ prog.cc -Wall -Wextra -std=c++17 -pedantic
prog.cc:7:5: error: attempt to use poisoned "putchar"
    7 |     putchar('A'); // fails to compile (as expected)
      |     ^
prog.cc:9:5: error: attempt to use poisoned "vfprintf"
    9 |     vfprintf(stdout, "Hello %s!\n", vlist); // does not fail (not expected)
      |     ^
prog.cc: In function 'void fn(const char*, ...)':
prog.cc:5:21: warning: unused parameter 'fmt' [-Wunused-parameter]
    5 | void fn(const char* fmt, ...)
      |         ~~~~~~~~~~~~^~~
Exit Code:
1