Add dependencies on .h files #included into Haskell source

Our .depend machinery doesn't automatically generate these, so we have
to add them manually.  (this fixes one instance of missing
dependencies in the GHC build tree, there are lots more...).

compiler/Makefile

@@ -477,7 +477,7 @@ SRC_MKDEPENDC_OPTS += -I$(GHC_INCLUDE_DIR)
 
 SRC_HC_OPTS += \
   -cpp -fglasgow-exts -fno-generics -Rghc-timing \
-  -I. -IcodeGen -InativeGen -Iparser
+  -I. -Iparser
 
 # Omitted: 	-I$(GHC_INCLUDE_DIR)
 # We should have -I$(GHC_INCLUDE_DIR) in SRC_HC_OPTS, 
@@ -853,6 +853,49 @@ TAGS_HS_SRCS = parser/Parser.y.pp $(filter-out $(DERIVED_SRCS) main/Config.hs pa
 
 include $(TOP)/mk/target.mk
 
+# -----------------------------------------------------------------------------
+# Explicit dependencies
+
+# Some .hs files #include other source files, but since ghc -M doesn't spit out
+# these dependencies we have to include them manually.
+
+# We don't add dependencies on HsVersions.h, ghcautoconf.h, or ghc_boot_platform.h,
+# because then modifying one of these files would force recompilation of everything,
+# which is probably not what you want.  However, it does mean you have to be
+# careful to recompile stuff you need if you reconfigure or change HsVersions.h.
+
+$(odir)/codeGen/Bitmap.hs	:  ../includes/MachDeps.h
+$(odir)/codeGen/CgCallConv.hs	:  ../includes/StgFun.h
+$(odir)/codeGen/CgProf.hs	:  ../includes/MachDeps.h
+$(odir)/codeGen/CgProf.hs	:  ../includes/Constants.h
+$(odir)/codeGen/CgProf.hs	:  ../includes/DerivedConstants.h
+$(odir)/codeGen/CgTicky.hs	:  ../includes/DerivedConstants.h
+$(odir)/codeGen/ClosureInfo.lhs	:  ../includes/MachDeps.h
+$(odir)/codeGen/SMRep.lhs	:  ../includes/MachDeps.h
+$(odir)/codeGen/SMRep.lhs	:  ../includes/ClosureTypes.h
+$(odir)/ghci/ByteCodeAsm.lhs	:  ../includes/Bytecodes.h
+$(odir)/ghci/ByteCodeFFI.lhs	:  nativeGen/NCG.h
+$(odir)/ghci/ByteCodeInstr.lhs	:  ../includes/MachDeps.h
+$(odir)/ghci/ByteCodeItbls.lhs	:  ../includes/ClosureTypes.h
+$(odir)/ghci/ByteCodeItbls.lhs	:  nativeGen/NCG.h
+$(odir)/main/Constants.lhs	:  ../includes/MachRegs.h
+$(odir)/main/Constants.lhs	:  ../includes/Constants.h
+$(odir)/main/Constants.lhs	:  ../includes/MachDeps.h
+$(odir)/main/Constants.lhs	:  ../includes/DerivedConstants.h
+$(odir)/main/Constants.lhs	:  ../includes/GHCConstants.h
+$(odir)/nativeGen/AsmCodeGen.lhs :  nativeGen/NCG.h
+$(odir)/nativeGen/MachCodeGen.hs :  nativeGen/NCG.h
+$(odir)/nativeGen/MachCodeGen.hs : ../includes/MachDeps.h
+$(odir)/nativeGen/MachInstrs.hs	:  nativeGen/NCG.h
+$(odir)/nativeGen/MachRegs.lhs	:  nativeGen/NCG.h
+$(odir)/nativeGen/MachRegs.lhs	:  ../includes/MachRegs.h
+$(odir)/nativeGen/PositionIndependentCode.hs :  nativeGen/NCG.h
+$(odir)/nativeGen/PprMach.hs	:  nativeGen/NCG.h
+$(odir)/nativeGen/RegAllocInfo.hs :  nativeGen/NCG.h
+$(odir)/typecheck/TcForeign.lhs	:  nativeGen/NCG.h
+$(odir)/utils/Binary.hs		:  ../includes/MachDeps.h
+$(odir)/utils/FastMutInt.lhs	:  ../includes/MachDeps.h
+
 # -----------------------------------------------------------------------------
 # Dependencies
 

compiler/nativeGen/AsmCodeGen.lhs

@@ -10,7 +10,7 @@
 module AsmCodeGen ( nativeCodeGen ) where
 
 #include "HsVersions.h"
-#include "NCG.h"
+#include "nativeGen/NCG.h"
 
 import MachInstrs
 import MachRegs