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

include config.mk
MKFILES := Makefile config.mk $(wildcard $(CFG_SRC_DIR)/mk/*.mk)

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

CFG_INFO := $(info cfg: building on $(CFG_OSTYPE) $(CFG_CPUTYPE))

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 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 :=$(call CFG_LIB_NAME,std)
CFG_RUSTCLIB :=$(call CFG_LIB_NAME,rustc)

# 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

# Compilers we build, we now know how to run.
STAGE0 := $(Q)$(call CFG_RUN_TARG,stage0,\
                stage0/rustc$(X) $(CFG_RUSTC_FLAGS) -L stage1)
STAGE1 := $(Q)$(call CFG_RUN_TARG,stage1, \
                $(CFG_VALGRIND_COMPILE) stage1/rustc$(X) \
                $(CFG_RUSTC_FLAGS) -L stage2)
STAGE2 := $(Q)$(call CFG_RUN_TARG,stage2, \
                $(CFG_VALGRIND_COMPILE) stage2/rustc$(X) \
                $(CFG_RUSTC_FLAGS) -L stage3)

# "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))

######################################################################
# Main target dependency variables
######################################################################

LREQ := rt/$(CFG_RUNTIME) rustllvm/$(CFG_RUSTLLVM)
SREQ0 := stage0/rustc$(X) $(LREQ) rt/main.o stage1/glue.o stage1/$(CFG_STDLIB)
SREQ1 := stage1/rustc$(X) $(LREQ) rt/main.o stage2/glue.o stage2/$(CFG_STDLIB)
SREQ2 := stage2/rustc$(X) $(LREQ) rt/main.o stage3/glue.o stage3/$(CFG_STDLIB)


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

export CFG_SRC_DIR
export CFG_VERSION
export CFG_LLVM_ROOT

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

LLVM_AS := $(CFG_LLVM_BINDIR)/llvm-as

LLC := $(CFG_LLVM_BINDIR)/llc

######################################################################
# Single-target rules
######################################################################

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: rt/$(CFG_RUNTIME)          \
     rustllvm/$(CFG_RUSTLLVM)   \
     stage0/$(CFG_STDLIB)       \
     stage0/intrinsics.bc       \
     stage0/rustc$(X)           \
     $(GENERATED)               \
     $(DOCS)                    \
     stage1/$(CFG_STDLIB)       \
     stage1/intrinsics.bc       \
     stage1/glue.o              \
     stage1/rustc$(X)           \

else

all: rt/$(CFG_RUNTIME)          \
     rustllvm/$(CFG_RUSTLLVM)   \
     stage0/$(CFG_STDLIB)       \
     stage0/intrinsics.bc       \
     stage0/rustc$(X)           \
     $(GENERATED)               \
     $(DOCS)                    \
     stage1/$(CFG_STDLIB)       \
     stage1/intrinsics.bc       \
     stage1/glue.o              \
     stage1/rustc$(X)           \
     stage2/$(CFG_STDLIB)       \
     stage2/intrinsics.bc       \
     stage2/glue.o              \
     stage2/rustc$(X)           \
     stage3/$(CFG_STDLIB)       \
     stage3/glue.o              \
     stage3/intrinsics.bc       \
     stage3/rustc$(X)

endif


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

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


######################################################################
# Additional makefiles
######################################################################

include $(CFG_SRC_DIR)/mk/intrinsics.mk
include $(CFG_SRC_DIR)/mk/stage0.mk
include $(CFG_SRC_DIR)/mk/stage1.mk
include $(CFG_SRC_DIR)/mk/stage2.mk
include $(CFG_SRC_DIR)/mk/stage3.mk
include $(CFG_SRC_DIR)/mk/rt.mk
include $(CFG_SRC_DIR)/mk/rustllvm.mk
include $(CFG_SRC_DIR)/mk/docs.mk
include $(CFG_SRC_DIR)/mk/tests.mk
include $(CFG_SRC_DIR)/mk/dist.mk
include $(CFG_SRC_DIR)/mk/snap.mk
include $(CFG_SRC_DIR)/mk/clean.mk
include $(CFG_SRC_DIR)/mk/autodep.mk
include $(CFG_SRC_DIR)/mk/fuzzer.mk
include $(CFG_SRC_DIR)/mk/pp.mk