From: Simon Strandgaard <neoneye@...>
Date: 2006-03-19T08:15:53+09:00
Subject: Re: incremental rebuild with Rake

I have noticed that the '.exe' file sometimes is'nt being linked.
What could be the reason for this?


Does'nt matter if I touch .h files or .cpp files.
Pretty odd.  Any ideas?  (maybe osx issue?)



prompt> touch a.h
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o a.o a.cpp
g++ -c -o main.o main.cpp
g++ a.o main.o -o test.exe
prompt> touch a.h
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o a.o a.cpp
g++ -c -o main.o main.cpp
prompt>




prompt> touch a.cpp
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o a.o a.cpp
g++ a.o main.o -o test.exe
prompt> touch a.cpp
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o a.o a.cpp
prompt>




prompt> touch main.cpp
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o main.o main.cpp
prompt> touch main.cpp
prompt> rake
(in /Users/simonstrandgaard/rake)
g++ -c -o main.o main.cpp
g++ a.o main.o -o test.exe
prompt>




prompt> uname -a
Darwin case.local 7.9.0 Darwin Kernel Version 7.9.0: Wed Mar 30
20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE_PPC  Power
Macintosh powerpc
prompt> rake --version
rake, version 0.5.4
prompt> ruby -v
ruby 1.8.2 (2004-11-03) [powerpc-darwin7.5.0]
prompt>



prompt> rake -P
(in /Users/simonstrandgaard/rake)
rake .depend.mf
rake a.o
    a.cpp
    a.h
rake clean
rake clobber
    clean
rake default
    test.exe
rake main.o
    main.cpp
    a.h
rake test.exe
    a.o
    main.o
prompt>





prompt> cat .depend.mf
# DO NOT DELETE

a.o: a.h
main.o: a.h





prompt> cat Rakefile
require 'rake/clean'
require 'rake/loaders/makefile'

APPLICATION = 'test.exe'
CPP_FILES = FileList['*.cpp']
O_FILES = CPP_FILES.sub(/\.cpp$/, '.o')

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

import ".depend.mf"

file APPLICATION => O_FILES do |t|
  sh "g++ #{O_FILES} -o #{t.name}"
end

rule ".o" => [".cpp"] do |t|
  sh "g++ -c -o #{t.name} #{t.source}"
end

CPP_FILES.each do |src|
  file src.ext(".o") => src
end

CLEAN.include("**/*.o")
CLEAN.include(APPLICATION)
CLEAN.include(".depend.mf")

task :default => APPLICATION






prompt> cat a.h
#ifndef __A_H__
#define __A_H__

#include <string>

std::string test_a();

#endif // __A_H__






prompt> cat a.cpp
#include "a.h"

std::string test_a()
{
        return std::string("a");
}






prompt> cat main.cpp
#include "a.h"

int main(int argc, char **argv)
{
        std::string s = test_a();
        printf("test %s\n", s.c_str());
        return 0;
}