[CMake] try_compile() to determine the largest available Fortran integer

[Williams, Norman K]

CMake string literals can contain newlines, so the version below is
more succinct and easier to read.

In this case everything works perfectly.  If you have to include strings
that look like variables to expand (e.g. ${THIS} ) you have to be careful
about using escapes.
In that particular case just escaping the '$' would suppress the variable
expansion.

macro(Fortran_biggest_int)
  message(STATUS "Checking for the largest available Fortran integer..")
  set(filename ${CMAKE_BINARY_DIR}/getbigint.f90)
  file(WRITE  ${filename} "program getbigint
  implicit none
  integer ,parameter :: DEFAULT = kind(1) , DEF_RANGE = range(kind(1))
  integer :: r, ktmp, k
  r = DEF_RANGE
  k = DEFAULT
  do
     r    = r + 1
     ktmp = selected_int_kind(r)
     if ( ktmp == -1 ) exit
     k = ktmp
  end do
  write(*,'(i0)') k
end program
")
try_run(BIG_INT_COMPILES BIG_INT_RUNS
    ${CMAKE_BINARY_DIR} ${filename}
    RUN_OUTPUT_VARIABLE FBIGINT)
  message(STATUS "Fortran big integer kind: ${FBIGINT}")
endmacro()





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