  Subshells for Compilation  Emacs uses a shell to run the
compilation command, but specifies the option for a
noninteractive shell. This means, in particular, that the shell
should start with no prompt. If you find your usual shell prompt
making an unsightly appearance in the `*compilation*' buffer, it
means you have made a mistake in your shell's init file by
setting the prompt unconditionally. (This init file's name may
be `.bashrc', `.profile', `.cshrc', `.shrc', or various other
things, depending on the shell you use.) The shell init file
should set the prompt only if there already is a prompt. In csh,
here is how to do it:  if ($?prompt) set prompt = ...  And
here's how to do it in bash:  if [ "${PS1+set}" = set ] then
PS1=...  There may well be other things that your shell's init
file ought to do only for an interactive shell. You can use the
same method to conditionalize them.  The MS-DOS "operating
system" does not support asynchronous subprocesses; to work
around this lack, M-x compile runs the comp