Hello May I check, does this attribute error output the error message usually? My example links fine without any warnings or errors. Maybe I am misunderstanding it. I am sharing a simple program below and godbolt trunk example. I only get to see the error message if I don't implement the function and get a link failure. https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes error ("message") warning ("message") If the error or warning attribute is used on a function declaration and a call to such a function is not eliminated through dead code elimination or other optimizations, an error or warning (respectively) that includes message is diagnosed. https://godbolt.org/z/n849GPTjj void compile_abort() __attribute__((error("compile abort"))); void compile_abort() { __builtin_abort(); } int main() { compile_abort(); }
