######################################################################
# Residual auto-configuration
######################################################################

include config.mk
MKFILES := Makefile config.mk $(wildcard $(CFG_SRC_DIR)/mk/*.mk)
MKFILES += $(CFG_SRC_DIR)/src/rt/libuv/Makefile
MKFILES += $(wildcard $(CFG_SRC_DIR)/src/rt/libuv/*.mk)

ifneq ($(MAKE_RESTARTS),)
CFG_INFO := $(info cfg: make restarts: $(MAKE_RESTARTS))
endif

CFG_INFO := $(info cfg: shell host triple $(CFG_HOST_TRIPLE))
CFG_INFO := $(info cfg: llvm host triple $(CFG_LLVM_TRIPLE))
CFG_INFO := $(info cfg: llvm target triples $(CFG_LLVM_TRIPLES))

ifdef CFG_DISABLE_OPTIMIZE
  $(info cfg: disabling rustc optimization (CFG_DISABLE_OPTIMIZE))
  CFG_RUSTC_FLAGS :=
else
  CFG_RUSTC_FLAGS := -O
endif

ifdef SAVE_TEMPS
  CFG_RUSTC_FLAGS += --save-temps
endif
ifdef TIME_PASSES
  CFG_RUSTC_FLAGS += --time-passes
endif
ifdef TIME_LLVM_PASSES
  CFG_RUSTC_FLAGS += --time-llvm-passes
endif
ifdef NO_TYPESTATE
  CFG_RUSTC_FLAGS += --no-typestate
endif
ifdef DEBUG
  CFG_RUSTC_FLAGS += -g
endif

# platform-specific auto-configuration
include $(CFG_SRC_DIR)/mk/platform.mk

# Run the stage1/2 compilers under valgrind
ifdef VALGRIND_COMPILE
  CFG_VALGRIND_COMPILE :=$(CFG_VALGRIND)
else
  CFG_VALGRIND_COMPILE :=
endif

CFG_RUNTIME :=$(call CFG_LIB_NAME,rustrt)
CFG_RUSTLLVM :=$(call CFG_LIB_NAME,rustllvm)
CFG_STDLIB :=$(call CFG_LIB_NAME,std)
CFG_LIBRUSTC :=$(call CFG_LIB_NAME,rustc)

ifdef CFG_DISABLE_SHAREDSTD
  CFG_STDLIB_DEFAULT = $(1)/lib/libstd.rlib
else
  CFG_STDLIB_DEFAULT = $(2)/lib/$(CFG_STDLIB)
endif

# version-string calculation
CFG_GIT_DIR := $(CFG_SRC_DIR).git
CFG_VERSION = prerelease
ifneq ($(wildcard $(CFG_GIT)),)
ifneq ($(wildcard $(CFG_GIT_DIR)),)
    CFG_VERSION += $(shell git --git-dir=$(CFG_GIT_DIR) log -1 \
                     --pretty=format:'(%h %ci)')
endif
endif

ifdef CFG_DISABLE_VALGRIND
  $(info cfg: disabling valgrind (CFG_DISABLE_VALGRIND))
  CFG_VALGRIND :=
endif
ifdef CFG_BAD_VALGRIND
  $(info cfg: disabling valgrind due to its unreliability on this platform)
  CFG_VALGRIND :=
endif

DOCS :=
ifeq ($(CFG_MAKEINFO),)
  $(info cfg: no makeinfo found, omitting doc/rust.html)
else
  DOCS += doc/rust.html
endif

ifeq ($(CFG_TEXI2PDF),)
  $(info cfg: no texi2pdf found, omitting doc/rust.pdf)
else
  ifeq ($(CFG_TEX),)
    $(info cfg: no tex found, omitting doc/rust.pdf)
  else
    DOCS += doc/rust.pdf
  endif
endif

ifdef CFG_DISABLE_DOCS
  $(info cfg: disabling doc build (CFG_DISABLE_DOCS))
  DOCS :=
endif

######################################################################
# Target-and-rule "utility variables"
######################################################################

ifdef VERBOSE
  Q :=
  E =
else
  Q := @
  E = echo $(1)
endif

S := $(CFG_SRC_DIR)
X := $(CFG_EXE_SUFFIX)

# Look in doc and src dirs.
VPATH := $(S)doc $(S)src

# "Source" files we generate in builddir along the way.
GENERATED :=

# Delete the built-in rules.
.SUFFIXES:
%:: %,v
%:: RCS/%,v
%:: RCS/%
%:: s.%
%:: SCCS/s.%

######################################################################
# Standard library variables
######################################################################

STDLIB_CRATE := $(S)src/lib/std.rc
STDLIB_INPUTS := $(wildcard $(addprefix $(S)src/lib/,*.rc *.rs */*.rs))

######################################################################
# rustc crate variables
######################################################################

COMPILER_CRATE := $(S)src/comp/rustc.rc
COMPILER_INPUTS := $(wildcard $(addprefix $(S)src/comp/, \
                                rustc.rc *.rs */*.rs */*/*.rs))

######################################################################
# Exports for sub-utilities
######################################################################

export CFG_SRC_DIR
export CFG_BUILD_DIR
export CFG_VERSION
export CFG_HOST_TRIPLE
export CFG_LLVM_ROOT
export CFG_ENABLE_MINGW_CROSS

######################################################################
# Subprograms
######################################################################

LLVM_AS := $(CFG_LLVM_BINDIR)/llvm-as$(X)

LLC := $(CFG_LLVM_BINDIR)/llc$(X)

######################################################################
# Per-stage targets and runner
######################################################################

define SREQ

TARGET_ROOT$(1)$(2) = stage$(1)/lib/rustc/$(2)
TARGET_BIN$(1)$(2) = $(TARGET_ROOT$(1)$(2))/bin
TARGET_LIB$(1)$(2) = $(TARGET_ROOT$(1)$(2))/lib
HOST_ROOT$(1) = $(TARGET_ROOT$(1)$$(CFG_HOST_TRIPLE))
HOST_BIN$(1) = $(TARGET_BIN$(1)$$(CFG_HOST_TRIPLE))
HOST_LIB$(1) = $(TARGET_LIB$(1)$$(CFG_HOST_TRIPLE))

ifdef CFG_DISABLE_SHAREDSTD
SREQ$(1)$(2) = $(HOST_BIN$(1))/rustc$(X)          \
           $(HOST_LIB$(1))/$$(CFG_RUNTIME)     \
           $$(call CFG_STDLIB_DEFAULT,stage$(1),stage$(1)) \
           $(HOST_LIB$(1))/$$(CFG_RUSTLLVM)    \
           $(TARGET_LIB$(1)$(2))/$$(CFG_RUNTIME) \
           $(TARGET_LIB$(1)$(2))/$$(CFG_STDLIB) \
           $(TARGET_LIB$(1)$(2))/intrinsics.bc \
           $(TARGET_LIB$(1)$(2))/main.o \
           $$(MKFILES)
else
SREQ$(1)$(2) = $(HOST_BIN$(1))/rustc$(X)          \
           $(HOST_LIB$(1))/$$(CFG_RUNTIME)     \
           $$(call CFG_STDLIB_DEFAULT,stage$(1),stage$(1)) \
           $(HOST_LIB$(1))/$$(CFG_RUSTLLVM)    \
           $(TARGET_LIB$(1)$(2))/$$(CFG_RUNTIME) \
           $(TARGET_LIB$(1)$(2))/$$(CFG_STDLIB) \
           $(TARGET_LIB$(1)$(2))/intrinsics.bc \
           $(TARGET_LIB$(1)$(2))/main.o \
           $$(MKFILES)
endif

ifeq ($(1),0)
# Don't run the the stage0 compiler under valgrind - that ship has sailed
CFG_VALGRIND_COMPILE$(1) =
else
CFG_VALGRIND_COMPILE$(1) = $$(CFG_VALGRIND_COMPILE)
endif

STAGE$(1) := $$(Q)$$(call CFG_RUN_TARG,stage$(1), \
                $$(CFG_VALGRIND_COMPILE) stage$(1)/bin/rustc$$(X) \
                $$(CFG_RUSTC_FLAGS) --target=$(2))

PERF_STAGE$(1) := $$(Q)$$(call CFG_RUN_TARG,stage$(1), \
                $$(CFG_PERF_TOOL) stage$(1)/bin/rustc$$(X) \
                $$(CFG_RUSTC_FLAGS) --target=$(2))

endef

FUZZ := stage1/bin/fuzzer$(X)

$(foreach target,$(CFG_TARGET_TRIPLES), \
 $(eval $(call SREQ,0,$(target))) \
 $(eval $(call SREQ,1,$(target))) \
 $(eval $(call SREQ,2,$(target))) \
 $(eval $(call SREQ,3,$(target))))

######################################################################
# Entrypoint rule
######################################################################

ifneq ($(CFG_IN_TRANSITION),)

CFG_INFO := $(info cfg:)
CFG_INFO := $(info cfg: *** compiler is in snapshot transition ***)
CFG_INFO := $(info cfg: *** stage2 and later will not be built ***)
CFG_INFO := $(info cfg:)

all: $(SREQ0$(CFG_HOST_TRIPLE)) $(SREQ1$(CFG_HOST_TRIPLE)) \
     $(GENERATED) $(DOCS) $(FUZZ)
else

ALL_SREQS = $(foreach target,$(CFG_TARGET_TRIPLES), \
 $(SREQ0$(target)) $(SREQ1$(target)) $(SREQ2$(target)) $(SREQ3$(target)))

all: $(ALL_SREQS) $(GENERATED) $(DOCS) $(FUZZ)
endif


######################################################################
# Re-configuration
######################################################################

config.mk: $(S)configure $(S)Makefile.in $(S)src/snapshots.txt
	@$(call E, cfg: reconfiguring)
	$(Q)$(S)configure $(CFG_CONFIGURE_ARGS)


######################################################################
# Primary-target makefiles
######################################################################

include $(CFG_SRC_DIR)/mk/intrinsics.mk
include $(CFG_SRC_DIR)/mk/stageN.mk
include $(CFG_SRC_DIR)/mk/stage0.mk
include $(CFG_SRC_DIR)/mk/rt.mk
include $(CFG_SRC_DIR)/mk/rustllvm.mk
include $(CFG_SRC_DIR)/mk/autodep.mk
include $(CFG_SRC_DIR)/mk/fuzzer.mk
include $(CFG_SRC_DIR)/mk/docs.mk


######################################################################
# Secondary makefiles, conditionalized for speed
######################################################################

ifneq ($(strip $(findstring dist,$(MAKECMDGOALS))   \
               $(findstring check,$(MAKECMDGOALS))  \
               $(findstring test,$(MAKECMDGOALS))   \
               $(findstring tidy,$(MAKECMDGOALS))   \
               $(findstring clean,$(MAKECMDGOALS))),)
  CFG_INFO := $(info cfg: including dist rules)
  include $(CFG_SRC_DIR)/mk/dist.mk
endif

ifneq ($(strip $(findstring snap,$(MAKECMDGOALS))   \
               $(findstring clean,$(MAKECMDGOALS))),)
  CFG_INFO := $(info cfg: including snap rules)
  include $(CFG_SRC_DIR)/mk/snap.mk
endif

ifneq ($(findstring reformat,$(MAKECMDGOALS)),)
  CFG_INFO := $(info cfg: including reformat rules)
  include $(CFG_SRC_DIR)/mk/pp.mk
endif

ifneq ($(strip $(findstring check,$(MAKECMDGOALS)) \
               $(findstring test,$(MAKECMDGOALS))  \
               $(findstring perf,$(MAKECMDGOALS))  \
               $(findstring tidy,$(MAKECMDGOALS))),)
  CFG_INFO := $(info cfg: including test rules)
  include $(CFG_SRC_DIR)/mk/tests.mk
endif

ifneq ($(findstring perf,$(MAKECMDGOALS)),)
  CFG_INFO := $(info cfg: including perf rules)
  include $(CFG_SRC_DIR)/mk/perf.mk
endif

ifneq ($(findstring clean,$(MAKECMDGOALS)),)
  CFG_INFO := $(info cfg: including clean rules)
  include $(CFG_SRC_DIR)/mk/clean.mk
endif