# -----------------------------------------------------------------------------
#
# (c) 2009 The University of Glasgow
#
# This file is part of the GHC build system.
#
# To understand how the build system works and how to modify it, see
#      http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
#      http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
#
# -----------------------------------------------------------------------------

# Bootstrapping ghc-cabal

# Euch, hideous hack:
# XXX This should be in a different Makefile
CABAL_DOTTED_VERSION := $(shell grep "^Version:" libraries/Cabal/Cabal.cabal | sed "s/^Version: //")
CABAL_VERSION := $(subst .,$(comma),$(CABAL_DOTTED_VERSION))
CABAL_CONSTRAINT := --constraint="Cabal == $(CABAL_DOTTED_VERSION)"

$(GHC_CABAL_INPLACE) : $(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext) | $$(dir $$@)/.
	"$(CP)" $< $@

$(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(wildcard libraries/Cabal/Distribution/*/*/*.hs)
$(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(wildcard libraries/Cabal/Distribution/*/*.hs)
$(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(wildcard libraries/Cabal/Distribution/*.hs)

$(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext): $(GHC_CABAL_DIR)/ghc-cabal.hs | $$(dir $$@)/. bootstrapping/.
	"$(GHC)" $(SRC_HC_OPTS) --make $(GHC_CABAL_DIR)/ghc-cabal.hs -o $@ \
	       -no-user-package-conf \
	       -Wall $(WERROR) \
	       -DCABAL_VERSION=$(CABAL_VERSION) \
	       -odir  bootstrapping \
	       -hidir bootstrapping \
	       -ilibraries/Cabal \
	       -ilibraries/filepath \
	       -ilibraries/hpc
	touch $@

# touch is required, because otherwise if mkdirhier is newer, we
# repeatedly rebuild ghc-cabal.

$(eval $(call clean-target,$(GHC_CABAL_DIR),dist,\
   $(GHC_CABAL_DIR)/dist bootstrapping))

$(eval $(call all-target,$(GHC_CABAL_DIR),$(GHC_CABAL_INPLACE)))

# -----------------------------------------------------------------------------
# dummy-ghc

# This is a tiny program to fool Cabal's configure that we have a
# stage1 GHC, which lets us configure all the packages before we've
# build stage1.

$(GHC_CABAL_DIR)_dist-dummy-ghc_MODULES = dummy-ghc
$(GHC_CABAL_DIR)_dist-dummy-ghc_PROG    = dummy-ghc$(exeext)

# depend on project.mk, so we pick up the new version number if it changes.
$(GHC_CABAL_DIR)/dist-dummy-ghc/build/dummy-ghc.hs : $(GHC_CABAL_DIR)/ghc.mk $(MKDIRHIER) mk/project.mk compiler/main/DynFlags.hs
	"$(MKDIRHIER)" $(dir $@)
	"$(RM)" $(RM_OPTS) $@
	echo 'import System.Environment'                                  >> $@
	echo 'import System.Cmd'                                          >> $@
	echo 'import System.Exit'                                         >> $@
	echo 'main :: IO ()'                                              >> $@
	echo 'main = do args <- getArgs'                                  >> $@
	echo '          case args of'                                     >> $@
	echo '              ["--numeric-version"] ->'                     >> $@
	echo '                  putStrLn "$(ProjectVersion)"'             >> $@
	echo '              ["--supported-languages"] ->'                 >> $@
	echo '                  mapM_ putStrLn extensions'                >> $@
	echo '              _ ->'                                         >> $@
	echo '                  do e <- rawSystem "$(GHC_STAGE0)" args'   >> $@
	echo '                     exitWith e'                            >> $@
# This unpleasant sed script grabs the lines between the
# 	xFlags ::
# line and the
#   ]
# line of compiler/main/DynFlags.hs, and if they look like
#   ( "PostfixOperators", ...
# then it translates them into
#   ["PostfixOperators"] ++
# Tabs are a pain to handle portably with sed, so rather than worrying
# about them we just use tr to remove them all before we start.
	echo 'extensions :: [String]'                                     >> $@
	echo 'extensions ='                                               >> $@
	'$(TR)' -d '\t' < compiler/main/DynFlags.hs | '$(SED)' '/^xFlags/,/]/s/^ *( *\("[^"]*"\)[^"]*/  [\1] ++/p;d' >> $@
	echo '  []'                                                       >> $@

# We don't build dummy-ghc with Cabal, so we need to pass -package
# flags manually
utils/ghc-cabal_dist-dummy-ghc_HC_OPTS = -package process
$(eval $(call build-prog,utils/ghc-cabal,dist-dummy-ghc,0))