On Wed, 2010-09-22 at 15:39 +0330, ali hagigat wrote:
> 'the path to the file found during directory search is used for any
> prerequisite lists which contain this target.'
> So the path of target is used for all its prerequisites, it is used to
> do what? The processing of all of prerequisites have been finished at
> the beginning of Step 4!!
Make is recursive. Every prerequisite is itself considered as a target.
Consider this example:
a: b
b: c
c: d
In "b: c", c is a prerequisite. But in "c: d", c is a target. These
are the same files, of course.
What the manual says is that when "c" is considered a target (when make
is evaluating the "c: d" rule), if it is found via vpath and not
rebuilt, then that vpath name will be used anywhere that "c" is
considered a prerequisite (that is, in "b: c").
So, if you had:
vpath c somedir
a: b
b: c
c: d
and ./c did not exist and ./somedir/c existed and did not need to be
rebuilt, then it would be as if you'd written "b: somedir/c".
--
-------------------------------------------------------------------------------
Paul D. Smith <[email protected]> Find some GNU make tips at:
http://www.gnu.org http://make.mad-scientist.net
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
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