[llvm] Conditionally include target intrinsics, based on --enable-target

Makefile.rules

 #===-- Makefile.rules - Common make rules for LLVM ---------*- Makefile -*--===#
 #
 #                     The LLVM Compiler Infrastructure
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
 #
 #===------------------------------------------------------------------------===#
 #
 # This file is included by all of the LLVM makefiles.  For details on how to use
@@ skipping 240 matching lines @@
     KEEP_SYMBOLS := 1
   else
     BuildMode := Debug
     CXX.Flags += -g
     C.Flags   += -g
     LD.Flags  += -g
     KEEP_SYMBOLS := 1
   endif
 endif
 
+CPP.Defines += $(patsubst %,-DTARGET_ENABLED_%,\
+        $(shell echo $(TARGETS_TO_BUILD) | tr a-z A-Z))
+
 ifeq ($(ENABLE_PROFILING),1)
   BuildMode := $(BuildMode)+Profile
   CXX.Flags := $(filter-out -fomit-frame-pointer,$(CXX.Flags)) -pg -g
   C.Flags   := $(filter-out -fomit-frame-pointer,$(C.Flags)) -pg -g
   LD.Flags  := $(filter-out -fomit-frame-pointer,$(LD.Flags)) -pg -g
   KEEP_SYMBOLS := 1
 endif
 
 #ifeq ($(ENABLE_VISIBILITY_INLINES_HIDDEN),1)
 #    CXX.Flags += -fvisibility-inlines-hidden
@@ skipping 416 matching lines @@
 Preprocess.C  = $(CC) $(CPP.Flags) $(C.Flags) $(CPPFLAGS) \
                 $(TargetCommonOpts) $(CompileCommonOpts) -E
 
 BCCompile.CXX = $(LLVMCXX) $(CPP.Flags) $(CXX.Flags) $(CXXFLAGS) $(CPPFLAGS) \
                 $(TargetCommonOpts) $(CompileCommonOpts)
 
 ProgInstall   = $(INSTALL) $(Install.StripFlag) -m 0755
 ScriptInstall = $(INSTALL) -m 0755
 DataInstall   = $(INSTALL) -m 0644
 
+# Tell TableGen which targets were enabled to do additional filtering.
+TABLEGEN_TARGET_FLAGS = $(patsubst %,-DTARGET_%,\
+        $(shell echo $(TARGETS_TO_BUILD) | tr a-z A-Z))
+
 # When compiling under Mingw/Cygwin, the tblgen tool expects Windows
 # paths. In this case, the SYSPATH function (defined in
 # Makefile.config) transforms Unix paths into Windows paths.
 TableGen      = $(TBLGEN) -I $(call SYSPATH, $(PROJ_SRC_DIR)) \
                 -I $(call SYSPATH, $(LLVM_SRC_ROOT)/include) \
                 -I $(call SYSPATH, $(PROJ_SRC_ROOT)/include) \
-                -I $(call SYSPATH, $(PROJ_SRC_ROOT)/lib/Target)
+                -I $(call SYSPATH, $(PROJ_SRC_ROOT)/lib/Target) \
+                $(TABLEGEN_TARGET_FLAGS)
 
 Archive       = $(AR) $(AR.Flags)
 LArchive      = $(LLVMToolDir)/llvm-ar rcsf
 ifdef RANLIB
 Ranlib        = $(RANLIB)
 else
 Ranlib        = ranlib
 endif
 
 AliasTool     = ln -s
@@ skipping 1559 matching lines @@
         $(Echo) "ProjLibsPaths: " '$(ProjLibsPaths)'
         $(Echo) "ProjLibsOptions: " '$(ProjLibsOptions)'
 
 ###
 # Debugging
 
 # General debugging rule, use 'make dbg-print-XXX' to print the
 # definition, value and origin of XXX.
 make-print-%:
         $(error PRINT: $(value $*) = "$($*)" (from $(origin $*)))