|
#ifdef CHECK_VARIABLE_EXISTS
|
|
|
|
extern int CHECK_VARIABLE_EXISTS;
|
|
|
|
int main()
|
|
{
|
|
int* p;
|
|
p = &CHECK_VARIABLE_EXISTS;
|
|
return 0;
|
|
}
|
|
|
|
#else /* CHECK_VARIABLE_EXISTS */
|
|
|
|
# error "CHECK_VARIABLE_EXISTS has to specify the variable"
|
|
|
|
#endif /* CHECK_VARIABLE_EXISTS */
|