From: Jim Weirich <jim@...>
Date: 2006-03-18T06:21:23+09:00
Subject: Re: incremental rebuild with Rake

Simon Strandgaard wrote:
> On 3/17/06, Simon Strandgaard <neoneye@gmail.com> wrote:
>> depends on the .h files.
> Anything smarter than converting makedepend to ruby, like this?

Actually, its a bit easier than that ... but its a poorly documented 
area of Rake.

Rake supports dependency files by importing them, like this:

   require 'rake/loaders/makefile'  # Load the makefile dependency 
loader
   import '.depend.mf'              # Import the dependencies.

(notice the .mf extension, that tells Rake that the dependencies are in 
makefile format).

So just create a task that builds the dependency files, similar to the 
above.

   file '.depend.mf' do
     sh "makedepend -f- -- #{CFLAGS} -- #{CPP_SOURCES} > .depend.mf"
   end

After the Rakefile has been read, but before the user requested targets 
are built, Rake will check to see if any imported dependencies have been 
requested.  If they have, rake will run any build targets for the 
dependencies (i.e. if the dependency file is out of date, it will 
rebuild it).  It will then load the dependencies (no need to convert 
makefile style dependencies, rake will parse the file if the makefile 
loader has been required as shown above).

The only gotcha in the scenario is that the dependency file rebuild 
cannot be triggered by any of the dependencies defined in the file 
(since the that file has not been loaded yet).

--
-- Jim Weirich

-- 
Posted via http://www.ruby-forum.com/.