/SystemRoot/home/trung> g++ test.cpp -o test test.cpp: In function 'int main(int, char**)': test.cpp:7:33: error: '_kern_is_computer_on' was not declared in this scope 7 | #define TEST_SYSCALL() _kern_is_computer_on() | ^~~~~~~~~~~~~~~~~~~~ test.cpp:23:9: note: in expansion of macro 'TEST_SYSCALL' 23 | TEST_SYSCALL(); | ^~~~~~~~~~~~ test.cpp:7:33: error: '_kern_is_computer_on' was not declared in this scope 7 | #define TEST_SYSCALL() _kern_is_computer_on() | ^~~~~~~~~~~~~~~~~~~~ test.cpp:29:8: note: in expansion of macro 'TEST_SYSCALL' 29 | TEST_SYSCALL(); | ^~~~~~~~~~~~