Merged in nitingupta910/premake-dev (pull request #81)

Fixes for gcc/clang

src/tools/clang.lua

@@ -214,8 +214,10 @@
 
 		if tool == "ar" then
 			return "ar"
-		else
+		elseif tool == "cc" then
 			return "clang"
+		elseif tool == "cxx" then
+			return "clang++"
 		end
 
 	end

src/tools/gcc.lua

@@ -96,6 +96,7 @@
 			Strict = "-ffloat-store",
 		},
 		optimize = {
+			Off = "-O0",
 			On = "-O2",
 			Size = "-Os",
 			Speed = "-O3",

tests/actions/make/cpp/test_clang.lua

@@ -32,7 +32,7 @@
 		test.capture [[
 ifeq ($(config),debug)
   CC = clang
-  CXX = clang
+  CXX = clang++
   AR = ar
   		]]
 	end

tests/tools/test_gcc.lua

@@ -114,6 +114,11 @@
 		test.isequal({ "-msse2" }, gcc.getcflags(cfg))
 	end
 
+	function suite.cflags_onNoOptimize()
+		optimize "Off"
+		prepare()
+		test.isequal({ "-O0" }, gcc.getcflags(cfg))
+	end
 
 --
 -- Check the translation of CXXFLAGS.