[CMake] several questions about cmake

[Jed Brown]

Quoth Stroustrup (http://www2.research.att.com/~bs/bs_faq2.html#void-main):

  The definition

          void main() { /* ... */ }

  is not and never has been C++, nor has it even been C. See the ISO C++
  standard 3.6.1[2] or the ISO C standard 5.1.2.2.1. A conforming
  implementation accepts

          int main() { /* ... */ }

  and

          int main(int argc, char* argv[]) { /* ... */ }

  A conforming implementation may provide more versions of main(), but
  they must all have return type int. The int returned by main() is a way
  for a program to return a value to "the system" that invokes it. On
  systems that doesn't provide such a facility the return value is
  ignored, but that doesn't make "void main()" legal C++ or legal C. Even
  if your compiler accepts "void main()" avoid it, or risk being
  considered ignorant by C and C++ programmers.


Mark, you may be correct that it's not the reason for the failure (I
haven't read the back-thread, which you broke) but I would be very
suspicious of code that is non-conforming.

Jed