make: allow empty commands

pdpmake didn't allow rules to have empty commands. There are
circumstances where this may be useful.

Make the following changes:

- Add a flag to readline() to indicate the next line is expected
  to be a command.  If this flag is true and the input line starts
  with a tab return it immediately, thus skipping the check for
  an empty line or comment line.

- In docmds() skip tabs and spaces after a command prefix.  If the
  resulting command is empty don't print it or try to execute it.

- In newcmd() allow empty commands.

Adds 48-96 bytes.

(pdpmake GitHub issue 56)

0 files changed, 0 insertions, 0 deletions