The darshan-gen-cc.pl script fails on generating a compiler wrapper due to the '-v' option not outputting anything to standard out. I don't think we even need this test specifically. I believe if we remove it and restructure a little, OpenMPI wrapper script generation will work.

my $version_out = $input_file -v 2>/dev/null |head -n 1; if (!($version_out)) { printf STDERR "Error: failed to invoke $input_file with -v\n"; exit(1); }