From: Mark Probert <probertm@...>
Date: 2005-03-30T07:11:05+09:00
Subject: rake help


Hi ..

I have just started using the excellent Rake tool (thanks, Jim!) and I am at a 
bit of a loss on how to proceed.  I am attempting to create unit test for 
some C++ code I am creating, using the cxxtest tool.  

cxxtest has its tests contained in a .h file.  These are then parsed by the 
tool to give your .cpp file.  This is then complied and linked with the 
object file.  

So, assuming I have my code in foo.cpp, my tests in foo_test.h, then the 
sequence looks like:

 $ c++ -c -o foo.o foo.cpp
 $ cxxtest.pl -o foo_test.cpp foo_test.h
 $ c++ -o foo_test foo_test.cpp foo.o

So, there are two issues that I am having problems with.  The first is turning 
the .h into a .cpp.  

The second is how to get the test to conditionally depend on foo.o.  I only 
want to create foo.o if it isn't there.  If it exists, then it will do for 
the build.  In reality, there will be multiple classes in each .o file, yet a 
unit test per class.

Anyway, here is my rakefile, which isn't quite right.  Giving:

 $ rake
 c++  -o unittest unittest scanner.o
 c++: unittest: No such file or directory
 rake aborted!

Many thanks,
-m.


# -!- Ruby -!-  
#
# Rakefile for cocor_cpp
#

LINK_OBJ = "scanner.o"
task :default => [:unittest]

# --------
# Unit test harness for cocor
#
def ext(fn, newext)
    fn.sub(/\.[^.]+$/, newext)
end

UT_SRC = [ "ts_buffer.h" ]
UT_CPP = UT_SRC.collect { |fn| ext(fn, ".cpp") }


UT_CPP.each do |utcpp|
    utsrc = ext(utcpp, ".h")
    file utcpp => [utsrc] do |t|
        cxxopt = "--have-eh --error-printer"
        sh( "cxxtestgen.pl #{cxxopt} -o #{utcpp} #{utsrc}" )
    end
end


task :unittest => UT_CPP do |t|
    exe = File.basename(t.name, '.*')
    sh( "c++  -o #{exe} #{t.name} #{LINK_OBJ}" )
end

-- 
-mark.  (probertm at acm dot org)