From: Brock Rycenga <brock.rycenga@...>
Date: 2008-10-23T00:41:00+09:00
Subject: Rake: How do I Override Var's Used by a Rule?

All:

For our rakefile system, we would like to have the ability to build
either a "debug" version of our code, or a "release" version. My plan is
to have 2 separate high-level tasks, where one of them invokes the other
- except with overridden variables. I wish I knew how to do this.  ;-)
Please help.

Here are my tasks (edited for brevity):

=============================
task :debug_build => [:build_depend, :build_obj] do
    # handle the linking
end

task :release_build do
    # Invoke the debug_build task, but override the following var's:
    #    C_OPTIMIZE_LVL="-o2"
    #    C_DEBUG=""
end
=============================

My .c -> .obj rule looks like this:

=============================
rule ".#{OBJ_EXT}" => lambda{|objfile| find_source(objfile)} do |t|
    sh "#{COMPILER} #{C_OPTS} #{C_DEBUG} #{C_OPTIMIZE_LVL} #{C_OBJ_DIR}
#{C_INC_PATHS} #{C_FLAGS} #{C_TARGET} #{t.source}"
end
=============================

So the only difference between the debug_build and release_build tasks
is the compile line. NOTE: I currently read those variables (COMPILER,
C_OPTS, etc.) from another rakefile.

Any suggestions? Am I going about this the wrong way?



Thanks,
Brock
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