Simple Fortran test for --int64, without math libraries

test/fc_int64/src/CMakeLists.txt

@@ -0,0 +1 @@
+add_executable(example example.f90)

test/fc_int64/src/example.f90

@@ -0,0 +1,14 @@
+program example
+   implicit none
+   ! max i*4 is 2,147,483,647, add 1 for i*8
+   integer*8, parameter :: i8ref = 2147483648
+   integer :: i
+   logical :: test_ok
+   i=i8ref
+   test_ok = (sizeof(i) == 8 .and. i == 2147483648)
+   if (test_ok) then
+      print *,"test_int64 ok"
+   else
+      stop "test_int64 failed!"
+   endif
+end program