Don't use the ACK preprocessor on host files --- use the host preprocessor

instead.

--HG--
branch : default-branch

first/core.mk

@@ -28,6 +28,26 @@ define cfile
 	$(eval $(cfile-rule))
 endef
 
+# --- Host preprocessor
+
+define cppfile-rule
+$o: $s
+	@echo CPP $o
+	@mkdir -p $(dir $o)
+	@$(CC) $(CFLAGS) $(cflags) -MM -MQ $o -o $d -x c $s
+	$(hide) $(CC) $(CFLAGS) $(cflags) -E -P -o $o -x c $s
+endef
+
+define cppfile
+	$(eval s := $1)
+	$(eval o := $(OBJDIR)/$(objdir)/$(1:=.m))
+	$(eval d := $(OBJDIR)/$(objdir)/$(1:=.d))
+	$(eval DEPENDS += $d)
+	$(eval CLEANABLES += $o $d)
+	$(eval q += $o)
+	$(eval $(cppfile-rule))
+endef
+
 # --- ACK compiler
 
 define ackfile-rule

mach/proto/as/build.mk

@@ -24,24 +24,16 @@ define build-as-impl
 
 	$(call yacc, $(OBJDIR)/$D, $(OBJDIR)/$D/preprocessed-comm2.y)
 
-$(eval CLEANABLES += $(OBJDIR)/$D/preprocessed-comm2.y)
-$(OBJDIR)/$D/preprocessed-comm2.y: mach/proto/as/comm2.y $(CPPANSI) \
-		mach/$(ARCH)/as/mach1.c \
-		mach/$(ARCH)/as/mach2.c \
-		mach/$(ARCH)/as/mach3.c \
-		mach/$(ARCH)/as/mach4.c
-	@echo PREPROCESS $$@
-	@mkdir -p $$(dir $$@)
-	$(hide) $(CPPANSI) -P \
-		-Imach/$(ARCH)/as \
-		-Imach/proto/as \
-		-Ih \
-		mach/proto/as/comm2.y > $$@
-
 	$(call rawfile, $(LIBOBJECT))
     $(call cprogram, $(BINDIR)/$(PLATFORM)/as)
     $(call installto, $(PLATDEP)/$(PLATFORM)/as)
 
+	$(call reset)
+    $(eval cflags += -Imach/$(ARCH)/as -I$(OBJDIR)/$D)
+    $(eval objdir := $(ARCH))
+	$(call cppfile, mach/proto/as/comm2.y)
+	$(call installto, $(OBJDIR)/$D/preprocessed-comm2.y)
+
     $(call reset)
     $(call rawfile, man/$(ARCH)_as.6)
     $(call installto, $(INSDIR)/share/man/man6/$(ARCH)_as.6)