[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: target variable ($@) as prerequisite

From: Oleksandr Gavenko
Subject: Re: target variable ($@) as prerequisite
Date: Thu, 27 Jan 2011 15:42:17 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101207 Thunderbird/3.1.7

On 27.01.2011 11:59, ulugutz wrote:
nope i am right. every target has the same dependency list. you agree with
that, right?
For which rules. In written code

PNG_FILES := $(wildcard *.png)
PDF_FILES := $(PNG_FILES:.png=.pdf)

.PHONY: all
all: $(PDF_FILES)

%.pdf: %.png
    cp $*.png $@

See what happen:

  $ touch 1.png 2.png
  $ make
cp 1.png 1.pdf
cp 2.png 2.pdf
  $ LANG=C make
make: Nothing to be done for `all'.
  $ touch 2.png
  $ make
 cp 2.png 2.pdf

Only one 'cp' operation take place in last case.

so if one timestamp of the dependencies changes all PDFs are
out of date :-/
Your case possible if write such dependency:

1.pdf 2.pdf: 1.png 2.png

i want to have only the png associated to the target in the dependency list.

See top description.

Or may be you need explain where I don't understand you.

С уважением, Александр Гавенко.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]