Re: Handling of shell builtins in make(1)

From: Sam Lawrance (boris_at_brooknet.com.au)
Date: 05/23/05

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    To: Harti Brandt <harti@freebsd.org>
Date: Tue, 24 May 2005 00:10:44 +1000

    On Mon, 2005-05-23 at 15:51 +0200, Harti Brandt wrote:
    > Hi all,
    >
    > I think I found a problem in the shell code in make(1), but I'm not sure
    > whether to fix it or not and how. The problem is as follows: in compat
    > mode (this is the default mode when make(1) is not called with -j) the
    > command lines of a target are executed by one shell per line (this is also
    > how Posix wants it). To reduce the number of shells make does an
    > optimisation: when the command line does not contain one of a pre-defined
    > set of meta characters and does not start with one of a predefined set of
    > shell builtins, make directly exec's the command instead of using an
    > intermediate shell. The problem is that the current list of builtins is
    > limited to:
    >
    > alias cd eval exec exit read set ulimit unalias umask unset wait
    >

    That explains some of ports/66342 for me.. in particular why setting
    "ECHO_CMD=echo -e" didn't perform entirely as I expected.

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