Shell avoidance in make-3.79.1-3

Randall R Schulz
Mon Jun 25 17:05:00 GMT 2001


I stand corrected. Now that you mention it, that does sound familiar.

That leaves only the question: Why are you asking when you know already?


At 16:59 2001-06-25, you wrote:
>Randall R Schulz wrote:
> > What are you trying to do? What do you mean by "/bin/sh avoidance?"
> >
> > Make has no ability to interpret commands, and relies on a shell to do
> > that for each command it decides to invoke.
>I you look at the source code (construct_command_argv in in job.c)
>you'll find some code that looks carefully at the command line.
>If the command line is sufficiently simply (eg sleep 15), make
>will perform an optimization whereby it starts the command
>directly. That is, instead of:
>         sh -c 'sleep 15'
>make will invoke the following directly:
>         sleep 15
>thus avoiding the overhead of a fork/exec of /bin/sh.

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