split cmake_check to cmake_check and clang_check

Makefile

@@ -858,8 +858,10 @@ pyston_profile: $(PROFILE_OBJS) $(LLVM_PROFILE_DEPS)
 	$(ECHO) Linking $@
 	$(VERB) $(CXX) $(PROFILE_OBJS) $(LDFLAGS_PROFILE) -o $@
 
-cmake_check:
+clang_check:
 	@clang --version >/dev/null || (echo "clang not available"; false)
+
+cmake_check:
 	@cmake --version >/dev/null || (echo "cmake not available"; false)
 	@ninja --version >/dev/null || (echo "ninja not available"; false)
 
@@ -873,13 +875,15 @@ CMAKE_DIR_DBG := $(HOME)/pyston-build-dbg
 CMAKE_DIR_RELEASE := $(HOME)/pyston-build-release
 CMAKE_SETUP_DBG := $(CMAKE_DIR_DBG)/build.ninja
 CMAKE_SETUP_RELEASE := $(CMAKE_DIR_RELEASE)/build.ninja
-.PHONY: cmake_check
+.PHONY: cmake_check clang_check
 $(CMAKE_SETUP_DBG):
 	@$(MAKE) cmake_check
+	@$(MAKE) clang_check
 	@mkdir -p $(CMAKE_DIR_DBG)
 	cd $(CMAKE_DIR_DBG); CC='clang' CXX='clang++' cmake -GNinja $(HOME)/pyston -DCMAKE_BUILD_TYPE=Debug
 $(CMAKE_SETUP_RELEASE):
 	@$(MAKE) cmake_check
+	@$(MAKE) clang_check
 	@mkdir -p $(CMAKE_DIR_RELEASE)
 	cd $(CMAKE_DIR_RELEASE); CC='clang' CXX='clang++' cmake -GNinja $(HOME)/pyston -DCMAKE_BUILD_TYPE=Release