Hello Rubyists,
I am new to rake and attempting to use it to build a small C++ project.
I made some changes to one of the example rake files from
rake.rubyforge.org and I want to have a separate source and build folder
named ‘src’ and ‘build’. I use the FileList to specify my cpp files,
then I modify that list with the ‘ext’ and ‘sub’ methods. I would expect
this to work, however I get this:
“Don’t know how to build task ‘build/CGfxOpenGL.o’” which points to this
line: “Rake::Task[‘link’].invoke” in the build task.
If I change these 2 lines:
exts = SRC.ext(‘o’)
OBJ = exts.sub(“#{SRC_DIR}”, “#{BUILD_DIR}”)
to just
OBJ = SRC.ext(‘o’)
it WORKS FINE except all my object files are in my src folder WHICH I
DON’T WANT.
How can I remedy this? I thought that since the ‘build/CGfxOpenGL.o’
does not exist that the rule ‘.o’ would execute which is what does the
compile.
many many thanks!
-Barry
require ‘rake/clean’
SRC_DIR = ‘src’
BUILD_DIR = ‘build’
SRC = FileList[“#{SRC_DIR}/*.cpp”]
exts = SRC.ext(‘o’)
OBJ = exts.sub(“#{SRC_DIR}”, “#{BUILD_DIR}”)
task :echo do
puts “Usage:\n”
puts " clean\n"
puts " build\n"
end
clean
CLEAN.include(“#{BUILD_DIR}/*.o”)
task :default => [“echo”]
task :init do
FileUtils.mkdir “#{BUILD_DIR}” if !FileTest.exists?(“#{BUILD_DIR}”)
end
compile
rule ‘.o’ => ‘.cpp’ do |t|
sh “g++ -Wall -Weffc++ -O2 -c -o #{t.name} #{t.source}”
end
link
file “link” => OBJ do
puts “myobject: #{OBJ}\n”;
sh “g++ -Wall -L/usr/local/lib -lglut -lGL -lGLU -o
#{BUILD_DIR}/Balance #{OBJ}”
end
build it!
task :build => [:init] do
Rake::Task[‘link’].invoke
end
File dependencies go here …
file ‘CGfxOpenGL.o’ => [‘CGfxOpenGL.cpp’,
‘CGfxOpenGL.h’]
file ‘winmain.o’ => [‘winmain.cpp’]
