[Bug libfortran/48961] EXECUTE_COMMAND_LINE(WAIT=.false.) fails on MinGW

[thenlich at users dot sourceforge.net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48961

--- Comment #8 from Thomas Henlich <thenlich at users dot sourceforge.net> 2011-05-14 12:54:26 UTC ---
Maybe I'm wrong, but I'm not sure the current implementation of asynchronous
execution is very efficient (on Unix systems):

We fork() and then call system(), which forks again and runs a shell, then the
shell exits, the forked process inside system() exits, the we exit our forked
process.

I think we might as well just fork and exec the shell directly which would save
one process creation. We also don't need the exit value from the system() call
in Fortran.