Remove old hack of creating a .a file with code that existed both in rust

and on newer versions of llvm.

mk/rustllvm.mk

@@ -2,39 +2,22 @@
 # rustc LLVM-extensions (C++) library variables and rules
 ######################################################################
 
-RUSTLLVM_LIB_CS := $(addprefix rustllvm/, Passes.cpp)
-
-RUSTLLVM_OBJS_CS := $(addprefix rustllvm/, RustWrapper.cpp)
+RUSTLLVM_OBJS_CS := $(addprefix rustllvm/, Passes.cpp RustWrapper.cpp)
 
 RUSTLLVM_DEF := rustllvm/rustllvm$(CFG_DEF_SUFFIX)
 
 RUSTLLVM_INCS := -iquote $(CFG_LLVM_INCDIR) \
                  -iquote $(S)src/rustllvm/include
-RUSTLLVM_LIB_OBJS := $(RUSTLLVM_LIB_CS:.cpp=.o)
 RUSTLLVM_OBJS_OBJS := $(RUSTLLVM_OBJS_CS:.cpp=.o)
 
-
-# FIXME: Building a .a is a hack so that we build with both older and newer
-# versions of LLVM. In newer versions some of the bits of this library are
-# already in LLVM itself, so they are skipped.
-rustllvm/rustllvmbits.a: $(RUSTLLVM_LIB_OBJS)
-	@$(call E, archive: $@)
-	$(Q)rm -f $@
-	$(Q)$(CFG_GCCISH_CROSS)ar crs $@ $^
-	$(Q)$(CFG_GCCISH_CROSS)ranlib $@
-
-# Note: We pass $(CFG_LLVM_LIBS) twice to fix the windows link since
-# it has no -whole-archive.
-rustllvm/$(CFG_RUSTLLVM): rustllvm/rustllvmbits.a $(RUSTLLVM_OBJS_OBJS) \
+rustllvm/$(CFG_RUSTLLVM): $(RUSTLLVM_OBJS_OBJS) \
                           $(MKFILES) $(RUSTLLVM_DEF)
 	@$(call E, link: $@)
 	$(Q)$(call CFG_LINK_C,$@,$(RUSTLLVM_OBJS_OBJS) \
 	  $(CFG_GCCISH_PRE_LIB_FLAGS) $(CFG_LLVM_LIBS) \
-          $(CFG_GCCISH_POST_LIB_FLAGS) rustllvm/rustllvmbits.a \
-	  $(CFG_LLVM_LIBS) \
+          $(CFG_GCCISH_POST_LIB_FLAGS) \
           $(CFG_LLVM_LDFLAGS),$(RUSTLLVM_DEF))
 
-
 rustllvm/%.o: rustllvm/%.cpp $(MKFILES)
 	@$(call E, compile: $@)
 	$(Q)$(call CFG_COMPILE_C, $@, $(CFG_LLVM_CXXFLAGS) $(RUSTLLVM_INCS)) $<