# -----------------------------------------------------------------------------
#
# (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
#
# -----------------------------------------------------------------------------


# Build a program.  Invoke like this:
#
# utils/genapply_MODULES = Main
# utils/genapply_HC_OPTS = -package Cabal
# utils/genapply_dist_PROG = genapply
#
# $(eval $(call build-prog,utils/genapply,dist-install,1))

define build-prog
$(call trace, build-prog($1,$2,$3))
$(call profStart, build-prog($1,$2,$3))
# $1 = dir
# $2 = distdir
# $3 = GHC stage to use (0 == bootstrapping compiler)

ifneq "$$(CLEANING)" "YES"
ifeq "$$($1_$2_PROG)" ""
$$(error $1_$2_PROG is not set)
endif
endif

ifeq "$$(findstring $3,0 1 2)" ""
$$(error $1/$2: stage argument to build-prog should be 0, 1, or 2)
endif

$(call clean-target,$1,$2,$1/$2)

ifneq "$$($1_$2_NOT_NEEDED)" "YES"
$$(eval $$(call build-prog-helper,$1,$2,$3))
endif
$(call profEnd, build-prog($1,$2,$3))
endef


define build-prog-helper
# $1 = dir
# $2 = distdir
# $3 = GHC stage to use (0 == bootstrapping compiler)

ifeq "$$($1_USES_CABAL)" "YES"
$1_$2_USES_CABAL = YES
endif

$(call package-config,$1,$2,$3)

$1_$2_depfile_base = $1/$2/build/.depend

ifeq "$$($1_$2_INSTALL_INPLACE)" "NO"
ifeq "$(findstring clean,$(MAKECMDGOALS))" ""
$1_$2_INPLACE = $$(error $1_$2 should not be installed inplace, but INPLACE var evaluated)
else
$1_$2_INPLACE =
endif
else
# Where do we install the inplace version?
ifeq "$$($1_$2_SHELL_WRAPPER) $$(Windows)" "YES NO"
$1_$2_INPLACE = $$(INPLACE_LIB)/$$($1_$2_PROG)
else
ifeq "$$($1_$2_TOPDIR)" "YES"
$1_$2_INPLACE = $$(INPLACE_TOPDIR)/$$($1_$2_PROG)
else
$1_$2_INPLACE = $$(INPLACE_BIN)/$$($1_$2_PROG)
endif
endif
endif

ifeq "$$($1_$2_USES_CABAL)" "YES"
$(call build-package-data,$1,$2,$3)
ifneq "$$(NO_INCLUDE_PKGDATA)" "YES"
ifeq "$3" "0"
include $1/$2/package-data.mk
else ifeq "$(phase)" "final"
include $1/$2/package-data.mk
endif
endif
endif

$(call all-target,$1,all_$1_$2)
$(call all-target,$1_$2,$1/$2/build/tmp/$$($1_$2_PROG))

# INPLACE_BIN might be empty if we're distcleaning
ifeq "$(findstring clean,$(MAKECMDGOALS))" ""
ifneq "$$($1_$2_INSTALL_INPLACE)" "NO"
$$($1_$2_INPLACE) : $1/$2/build/tmp/$$($1_$2_PROG) | $$$$(dir $$$$@)/.
	"$$(CP)" -p $$< $$@
	touch $$@
endif
endif

$(call shell-wrapper,$1,$2)

$1_$2_WAYS = v

$(call hs-sources,$1,$2)
$(call c-sources,$1,$2)

# --- IMPLICIT RULES

# Just the 'v' way for programs
$(call distdir-way-opts,$1,$2,v,$3)

ifeq "$3" "0"
# For stage 0, we use GHC to compile C sources so that we don't have to
# worry about where the RTS header files are
$(call c-suffix-rules,$1,$2,v,YES)
else
$(call c-suffix-rules,$1,$2,v,NO)
endif

$(call hs-suffix-rules,$1,$2,v)
$$(foreach dir,$$($1_$2_HS_SRC_DIRS),\
  $$(eval $$(call hs-suffix-rules-srcdir,$1,$2,v,$$(dir))))

$(call c-objs,$1,$2,v)
$(call hs-objs,$1,$2,v)

$1_$2_LINK_WITH_GCC = NO
ifeq "$$(BootingFromHc)" "YES"
$1_$2_LINK_WITH_GCC = YES
endif

ifeq "$$($1_$2_v_HS_OBJS)" ""
# We don't want to link the GHC RTS into C-only programs. There's no
# point, and it confuses the test that all GHC-compiled programs
# were compiled with the right GHC.
$1_$2_GHC_LD_OPTS = -no-auto-link-packages -no-hs-main
endif

ifneq "$$(BINDIST)" "YES"
# The quadrupled $'s here are because the _v_LIB variables aren't
# necessarily set when this part of the makefile is read
$1/$2/build/tmp/$$($1_$2_PROG) : \
    $$(foreach dep,$$($1_$2_DEP_NAMES),\
        $$(if $$(filter ghc,$$(dep)),\
            $(if $(filter 0,$3),$$(compiler_stage1_v_LIB),\
            $(if $(filter 1,$3),$$(compiler_stage2_v_LIB),\
            $(if $(filter 2,$3),$$(compiler_stage2_v_LIB),\
            $$(error Bad build stage)))),\
        $$$$(libraries/$$(dep)_dist-$(if $(filter 0,$3),boot,install)_v_LIB)))

ifeq "$$($1_$2_LINK_WITH_GCC)" "NO"
$1/$2/build/tmp/$$($1_$2_PROG) : $$($1_$2_v_HS_OBJS) $$($1_$2_v_C_OBJS) $$($1_$2_v_S_OBJS) $$($1_$2_OTHER_OBJS) | $$$$(dir $$$$@)/.
	"$$($1_$2_HC)" -o $$@ $$($1_$2_v_ALL_HC_OPTS) $$(LD_OPTS) $$($1_$2_GHC_LD_OPTS) $$($1_$2_v_HS_OBJS) $$($1_$2_v_C_OBJS) $$($1_$2_v_S_OBJS) $$($1_$2_OTHER_OBJS) $$(addprefix -l,$$($1_$2_EXTRA_LIBRARIES))
else
$1/$2/build/tmp/$$($1_$2_PROG) : $$($1_$2_v_HS_OBJS) $$($1_$2_v_C_OBJS) $$($1_$2_v_S_OBJS) $$($1_$2_OTHER_OBJS) | $$$$(dir $$$$@)/.
	"$$(CC)" -o $$@ $$($1_$2_v_ALL_CC_OPTS) $$(LD_OPTS) $$($1_$2_v_HS_OBJS) $$($1_$2_v_C_OBJS) $$($1_$2_v_S_OBJS) $$($1_$2_OTHER_OBJS) $$($1_$2_v_EXTRA_CC_OPTS) $$(addprefix -l,$$($1_$2_EXTRA_LIBRARIES))
endif

# Note [lib-depends] if this program is built with stage1 or greater, we
# need to depend on the libraries too.  NB. since $(ALL_STAGE1_LIBS) and
# $(ALL_RTS_LIBS) are not defined until after libraries/*/ghc.mk have
# been included, this introduces an ordering dependency.
ifneq "$$(CLEANING)" "YES"
ifneq "$3" "0"
ifneq "$$($1_$2_HS_SRCS)" ""
ifeq "$$(strip $$(ALL_STAGE1_LIBS))" ""
$$(error ordering failure in $1 ($2): ALL_STAGE1_LIBS is empty)
endif
endif
$1/$2/build/tmp/$$($1_$2_PROG) : $$(ALL_STAGE1_LIBS) $$(ALL_RTS_LIBS) $$(OTHER_LIBS)
endif
endif
endif

ifneq "$$($1_$2_INSTALL_INPLACE)" "NO"
$(call all-target,$1_$2,$$($1_$2_INPLACE))
endif
$(call clean-target,$1,$2_inplace,$$($1_$2_INPLACE))

ifeq "$$($1_$2_INSTALL)" "YES"
ifeq "$$($1_$2_TOPDIR)" "YES"
INSTALL_TOPDIRS += $1/$2/build/tmp/$$($1_$2_PROG)
else
INSTALL_BINS += $1/$2/build/tmp/$$($1_$2_PROG)
endif
endif

# --- DEPENDENCIES
# We always have the dependency rules available, as we need to know
# how to build hsc2hs's dependency file in phase 0
$(call build-dependencies,$1,$2,$3)
ifneq "$(phase)" "0"
# From phase 1 we actually include the dependency files for the
# bootstrapping stuff
ifeq "$3" "0"
$(call include-dependencies,$1,$2,$3)
else ifeq "$(phase)" "final"
# In the final phase, we also include the dependency files for
# everything else
$(call include-dependencies,$1,$2,$3)
endif
endif

endef