From: Jim Weirich <jweirich@...>
Date: 2003-03-22T09:23:21+09:00
Subject: Re: Rake problem?

On Fri, 2003-03-21 at 14:44, Manfred wrote:
> Hi,
> 
> I tried to execute the examples which came with rake.
> 
> When executing Rakefile1 then gcc gets invoked even when main is properly build.
> 
> However rake -f Rakefile2 works fine.
> 
> Is it an error or do I miss anything?

Its an error in Rakefile1 in the examples.  I have a file task ("main")
depending on a normal task (:obj).  Since the time stamp of normal tasks
is always the current time, "main" is always out of date. (Perhaps this
approach needs some more thought.  This means a file task should never
depend on a non-file task ... an unfortunate restriction.)

Apply the attached patch to correct Rakefile1.

I'll have to review the examples.  I intended to write some annotations
to the examples but haven't done that yet.  

Thanks for the feedback.

-- 
-- Jim Weirich     jweirich@one.net    http://w3.one.net/~jweirich
---------------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct, 
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)

--- Rakefile1	19 Mar 2003 12:48:05 -0000	1.1
+++ Rakefile1	21 Mar 2003 23:47:43 -0000
@@ -17,9 +17,10 @@
   Sys.run "gcc #{src} -c -o #{t.name}"
 end
 
-task :obj => ["a.o", "b.o", "main.o"]
+OBJFILES = ["a.o", "b.o", "main.o"]
+task :obj => OBJFILES
 
-file "main" => [:obj] do |t|
+file "main" => OBJFILES do |t|
   Sys.run "gcc -o #{t.name} main.o a.o b.o"
 end