build object files for sources

build_tests/c-simple/spec.rb

@@ -1,5 +1,6 @@
 it 'builds a C program with one source file' do
   env = Rscons::Environment.new
   env.Program('simple', 'simple.c')
+  File.exist?('simple.o').should be_true
   `./simple`.should =~ /This is a simple C program/
 end

lib/rscons/builder.rb

@@ -1,4 +1,7 @@
 module Rscons
   class Builder
+    def self.makes_object_file?(env, fname)
+      false
+    end
   end
 end

lib/rscons/builders/cc.rb

@@ -2,12 +2,30 @@ module Rscons
   class CC < Builder
     VARIABLE_DEFAULTS = {
       'CC' => 'gcc',
-      'CFLAGS' => [],
+      'CFLAGS' => ['-c'],
       'CPPFLAGS' => [],
       'OBJSUFFIX' => '.o',
+      'CEXTS' => ['.c'],
     }
 
-    def run(env, target, sources)
+    def self.makes_object_file?(env, fname)
+      env['CEXTS'].find do |cext|
+        fname =~ /#{cext}$/
+      end
+    end
+
+    def run(env, target, source)
+      raise "String expected, not #{source.inspect}" unless source.is_a?(String)
+      o_file = "#{env.stem(source)}#{env['OBJSUFFIX']}"
+      command = [
+        env['CC'],
+        *env['CPPFLAGS'],
+        *env['CFLAGS'],
+        '-o', o_file,
+        source
+      ]
+      env.execute("CC #{o_file}", command)
+      o_file
     end
   end
 end

lib/rscons/builders/program.rb

@@ -10,6 +10,20 @@ module Rscons
     }
 
     def run(env, target, sources)
+      sources = [sources] if sources.is_a?(String)
+      sources = sources.map do |source|
+        if source =~ /#{env['OBJSUFFIX']}$/ or source =~ /#{env['LIBSUFFIX']}$/
+          source
+        else
+          builder_class = env.builders.values.find { |klass| klass.makes_object_file?(env, source) }
+          if builder_class
+            builder = builder_class.new
+            builder.run(env, env.stem(source) + env['OBJSUFFIX'], source)
+          else
+            raise "No builder found to convert input source #{source.inspect} to an object file."
+          end
+        end
+      end
       command = [
         env['LD'] || env['CC'],
         '-o', target,
@@ -19,6 +33,7 @@ module Rscons
         *env['LIBS'].map {|lib| "-l#{lib}"}
       ]
       env.execute("LINK #{target}", command)
+      target
     end
   end
 end

lib/rscons/environment.rb

@@ -7,6 +7,9 @@ module Rscons
     #  :command (default) - print the full command being executed
     attr_accessor :echo
 
+    # Hash of Builder Name => Builder Class
+    attr_reader :builders
+
     def initialize(options = {})
       @echo = :command
       @variables = options.reject { |key, val| not key[0] =~ /[A-Z]/ }
@@ -53,6 +56,10 @@ module Rscons
       system(*command)
     end
 
+    def stem(fname)
+      fname.sub(/\.[^.]*$/, '')
+    end
+
     def method_missing(method, *args)
       if @builders.has_key?(method.to_s)
         # TODO: build sources if necessary