* In practice indexing into RMA buffers may require 64bit addressing,
  even though individual data sets are still limited to INT_MAX
  entries.

Thomas Jahns authored 3 years ago and Sergey Kosukhin committed 2 years ago

Co-authored-by: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>

Thomas Jahns authored 3 years ago and Sergey Kosukhin committed 2 years ago

* These variables are checked via the JSON files in PIO control setups
  and should not change type unless necessary. Consistency is not a
  necessity.

Both 'head -n 1' and 'sed 1q' exit after printing the first line, which closes
the pipe and kills the compiler's process leaving it no chance to clean any
temporary files it might have created (e.g. Intel compiler creates 'a.out' when
it is called with additional flags like -I, -L, etc., which is the case when
$CC/$FC is an MPI wrapper.

And make sure that the result is the same as for Fortran (FC).

The conditional indicates that FC is available and all required compiler flags
are known.