From: nobu.nokada@...
Date: 2002-02-08T02:20:04+09:00
Subject: Re: mkmf, extconf.rb

Hi,

At Thu, 7 Feb 2002 19:22:28 +0900,
Hugh Sasse Staff Elec Eng <hgs@dmu.ac.uk> wrote:
> > > Further to my suggestions in Ruby-Talk:31391, about adding methods to
> > > mkmf so that rules can be added to makefiles, I have "lashed together"
> > > the following patch.  It works with an array of dependencies, but before
> > > I test all the combinations of arguments permitted, has anyone any
> > > comments?
> >
> > I guess you can do it with `depend' file.
> 
> I have found that bit of code in mkmf:
(snip)
> I don't think you can use this for adding more make rules, because it is
> not completely transparent.  Suppose your action includes  ruby code
> which does 'gsub(/\.o\b/, ".#{$OBJEXT}")'.  This will get rendered as
> "gsub(/\.#{$OBJEXT}\b/" etc.

It's sure not to be designed for general purpose.

> Maybe this could be extracted to a method, and have the substitution
> optional?

def add_rules(rules)
  open("Makefile", "a") do |f|
    if defined? yield
      rules.each {|l| f << yield l}
    else
      f << rules
    end
  end
end

# or as you wrote in [ruby-talk:33238], append to $makerules.
$makerules = ""
def add_rules(rules)
  f = $makerules
  if defined? yield
    rules.each {|l| f << yield l}
  else
    f << rules
  end
end

# And then
add_rules("depend") {|l| l.gsub(/\.o\b/, ".#{$OBJEXT}")}

add_rules << EOM
# rules
EOM


# or maybe,
Makerules = []
def Makerules.add(rules, &block)
  self << [rules, block]
end
def Makerules.write(to)
  each {|r, b| b ? r.each {|l| to << b.call(l)} : to << l}
end


-- 
Nobu Nakada