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Re: about :: sign and % sign problems
From: |
Lin George |
Subject: |
Re: about :: sign and % sign problems |
Date: |
Thu, 27 Apr 2006 22:31:23 -0700 (PDT) |
Thank you very much Paul!
Your reply has answered my question.
regards,
George
--- "Paul D. Smith" <address@hidden> wrote:
> %% Lin George <address@hidden> writes:
>
> >> foo:: bar ; echo Update due to bar
>
> >> foo:: baz ; echo Update due to baz
>
> lg> Good example! I think the effect is the same
> as the following
> lg> statements (I think either bar or baz is out
> of date, foo will be
> lg> remade.),
>
> lg> foo: bar baz ; echo something
>
> But this doesn't do the same thing.
>
> In my example above, "Update due to bar" will be
> printed if foo is out
> of date with respect to bar, and "Update due to baz"
> will be printed if
> foo is out of date with respect to baz. If neither
> is out of date,
> nothing is printed. If both are out of date, both
> are printed.
>
> In your example, "something" is printed if either or
> both of bar and baz
> are out of date.
>
> lg> except that it is not easy to detect whether
> foo is remade by bar
> lg> or remade by baz. Is that correct?
>
> No, it's easy to tell which prerequisites were out
> of date. Look up the
> $? variable in the GNU make manual.
>
> --
>
-------------------------------------------------------------------------------
> Paul D. Smith <address@hidden> Find some
> GNU make tips at:
> http://www.gnu.org
> http://make.paulandlesley.org
> "Please remain calm...I may be mad, but I am a
> professional." --Mad Scientist
>
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- Re: about :: sign and % sign problems, (continued)
- Re: about :: sign and % sign problems, John Graham-Cumming, 2006/04/26
- Re: about :: sign and % sign problems, Lin George, 2006/04/26
- Re: about :: sign and % sign problems, John Graham-Cumming, 2006/04/26
- Re: about :: sign and % sign problems, Paul D. Smith, 2006/04/26
- Re: about :: sign and % sign problems, Lin George, 2006/04/26
- Re: about :: sign and % sign problems, Paul D. Smith, 2006/04/26
- Re: about :: sign and % sign problems, Lin George, 2006/04/26
- Re: about :: sign and % sign problems, Paul D. Smith, 2006/04/26
- Re: about :: sign and % sign problems, Lin George, 2006/04/26
- Re: about :: sign and % sign problems, Paul D. Smith, 2006/04/27
- Re: about :: sign and % sign problems,
Lin George <=
- Re: about :: sign and % sign problems, Lin George, 2006/04/26