distinguish object files built from multiple sources with the same base name but different extensions - close #113

build_tests/custom_builder/build_after.rb

@@ -6,7 +6,8 @@ build do
                 "CMD_DESC" => "Generating")
     env["build_root"] = env.build_root
     env["inc_c"] = "inc.c"
-    env.build_after("${build_root}/program.o", "${inc_c}")
-    env.Program("program.exe", ["program.c", "inc.c"])
+    env.Object("program.o", "program.c")
+    env.build_after("program.o", "${inc_c}")
+    env.Program("program.exe", ["program.o", "inc.c"])
   end
 end

build_tests/custom_builder/produces.rb

@@ -4,8 +4,9 @@ build do
     env["inc_h"] = "inc.h"
 
     env.Copy("copy_inc.h", "${inc_h}")
-    env.depends("${build_root}/program.o", "${inc_h}")
-    env.Program("program.exe", ["program.c", "inc.c"])
+    env.depends("program.o", "${inc_h}")
+    env.Object("program.o", "program.c")
+    env.Program("program.exe", ["program.o", "inc.c"])
 
     inc_c = env.Command("inc.c",
                         [],

build_tests/custom_builder/produces_env.rb

@@ -4,8 +4,9 @@ build do
     env["inc_h"] = "inc.h"
 
     env.Copy("copy_inc.h", "${inc_h}")
-    env.depends("${build_root}/program.o", "${inc_h}")
-    env.Program("program.exe", ["program.c", "inc.c"])
+    env.depends("program.o", "${inc_h}")
+    env.Object("program.o", "program.c")
+    env.Program("program.exe", ["program.o", "inc.c"])
 
     env.Command("inc.c",
                 [],