CMake/Tests/CustomCommandByproducts/CustomCommandByproducts.c

extern int byproduct1(void);
extern int byproduct2(void);
extern int byproduct3(void);
extern int byproduct4(void);
extern int byproduct5(void);
extern int byproduct6(void);
extern int byproduct7(void);
extern int byproduct8(void);
extern int ExternalLibrary(void);
int main(void)
{
  return (
    byproduct1() +
    byproduct2() +
    byproduct3() +
    byproduct4() +
    byproduct5() +
    byproduct6() +
    byproduct7() +
    byproduct8() +
    ExternalLibrary() +
    0);
}