/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();
      |        ^~~~~~~~~~~~