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# An explanation of how the build is structured:
#
# There are multiple build stages (0-3) needed to verify that the
# compiler is properly self-hosting. Each stage is divided between
# 'host' artifacts and 'target' artifacts, where the stageN host
# compiler builds artifacts for 1 or more stageN target architectures.
# Once the stageN target compiler has been built for the host
# architecture it is promoted (copied) to a stageN+1 host artifact.
#
# The stage3 host compiler is a compiler that successfully builds
# itself and should (in theory) be bitwise identical to the stage2
# host compiler. The process is bootstrapped using a stage0 host
# compiler downloaded from a previous snapshot.
#
# At no time should stageN artifacts be interacting with artifacts
# from other stages. For consistency, we use the 'promotion' logic
# for all artifacts, even those that don't make sense on non-host
# architectures.
#
# The directory layout for a stage is intended to match the layout
# of the installed compiler, and looks like the following:
#
# stageN - this is the system root, corresponding to, e.g. /usr
# bin - binaries compiled for the host
# lib - libraries used by the host compiler
# rustc - rustc's own place to organize libraries
# $(target) - target-specific artifacts
# bin - binaries for target architectures
# lib - libraries for target architectures
#
# A note about host libraries:
#
# The only libraries that get promoted to stageN/lib are those needed
# by rustc. In general, rust programs, even those compiled for the
# host architecture will use libraries from the target
# directories. This gives rust some freedom to experiment with how
# libraries are managed and versioned without polluting the common
# areas of the filesystem.
#
# General rust binaries may stil live in the host bin directory; they
# will just link against the libraries in the target lib directory.
#
# Admittedly this is a little convoluted.

STAGES = 0 1 2 3

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

# Recursive wildcard function
# http://blog.jgc.org/2011/07/gnu-make-recursive-wildcard-function.html
rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) \
  $(filter $(subst *,%,$2),$d))

include config.mk

# We track all of the object files we might build so that we can find
# and include all of the .d files in one fell swoop.
ALL_OBJ_FILES :=

MKFILE_DEPS := config.stamp $(call rwildcard,$(CFG_SRC_DIR)mk/,*)
NON_HOST_TRIPLES = $(filter-out $(CFG_HOST_TRIPLE),$(CFG_TARGET_TRIPLES))

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

CFG_INFO := $(info cfg: shell host triple $(CFG_HOST_TRIPLE))

ifneq ($(wildcard $(NON_HOST_TRIPLES)),)
CFG_INFO := $(info cfg: non host triples $(NON_HOST_TRIPLES))
endif

CFG_RUSTC_FLAGS := $(RUSTFLAGS)
CFG_GCCISH_CFLAGS :=
CFG_GCCISH_LINK_FLAGS :=

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

ifdef CFG_ENABLE_DEBUG
  $(info cfg: enabling more debugging (CFG_ENABLE_DEBUG))
  CFG_RUSTC_FLAGS +=
  CFG_GCCISH_CFLAGS += -DRUST_DEBUG
else
  CFG_GCCISH_CFLAGS += -DRUST_NDEBUG
endif

ifdef SAVE_TEMPS
  CFG_RUSTC_FLAGS += --save-temps
endif
ifdef TIME_PASSES
  CFG_RUSTC_FLAGS += -Z time-passes
endif
ifdef TIME_LLVM_PASSES
  CFG_RUSTC_FLAGS += -Z time-llvm-passes
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_CORELIB :=$(call CFG_LIB_NAME,core)
CFG_STDLIB :=$(call CFG_LIB_NAME,std)
CFG_LIBRUSTC :=$(call CFG_LIB_NAME,rustc)
CFG_LIBSYNTAX :=$(call CFG_LIB_NAME,syntax)

STDLIB_GLOB :=$(call CFG_LIB_GLOB,std)
CORELIB_GLOB :=$(call CFG_LIB_GLOB,core)
LIBRUSTC_GLOB :=$(call CFG_LIB_GLOB,rustc)
LIBSYNTAX_GLOB :=$(call CFG_LIB_GLOB,syntax)
STDLIB_DSYM_GLOB :=$(call CFG_LIB_DSYM_GLOB,std)
CORELIB_DSYM_GLOB :=$(call CFG_LIB_DSYM_GLOB,core)
LIBRUSTC_DSYM_GLOB :=$(call CFG_LIB_DSYM_GLOB,rustc)
LIBSYNTAX_DSYM_GLOB :=$(call CFG_LIB_DSYM_GLOB,syntax)

# version-string calculation
CFG_GIT_DIR := $(CFG_SRC_DIR).git
CFG_RELEASE = 0.3.1
CFG_VERSION = $(CFG_RELEASE)

ifneq ($(wildcard $(CFG_GIT)),)
ifneq ($(wildcard $(CFG_GIT_DIR)),)
    CFG_VERSION += $(shell git --git-dir=$(CFG_GIT_DIR) log -1 \
                     --pretty=format:'(%h %ci)')
    CFG_VER_HASH = $(shell git --git-dir=$(CFG_GIT_DIR) log -1 \
                     --pretty=format:'%H')
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


######################################################################
# 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.%

######################################################################
# Core library variables
######################################################################

CORELIB_CRATE := $(S)src/libcore/core.rc
CORELIB_INPUTS := $(wildcard $(addprefix $(S)src/libcore/, \
                                           core.rc *.rs */*.rs))

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

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

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

COMPILER_CRATE := $(S)src/rustc/rustc.rc
COMPILER_INPUTS := $(filter-out $(S)src/rustc/driver/rustc.rs, \
                       $(wildcard $(addprefix $(S)src/rustc/, \
                           rustc.rc *.rs */*.rs */*/*.rs */*/*/*.rs)))

LIBSYNTAX_CRATE := $(S)src/libsyntax/syntax.rc
LIBSYNTAX_INPUTS := $(wildcard $(addprefix $(S)src/libsyntax/, \
                            syntax.rc *.rs */*.rs */*/*.rs))

RUSTC_INPUTS := $(S)src/rustc/driver/rustc.rs

######################################################################
# LLVM macros
######################################################################

# FIXME: x86-ism
LLVM_COMPONENTS=x86 ipo bitreader bitwriter linker asmparser

define DEF_LLVM_VARS
# The configure script defines these variables with the target triples
# separated by Z. This defines new ones with the expected format.
CFG_LLVM_BUILD_DIR_$(1):=$$(CFG_LLVM_BUILD_DIR_$(subst -,_,$(1)))
CFG_LLVM_INST_DIR_$(1):=$$(CFG_LLVM_INST_DIR_$(subst -,_,$(1)))

# Any rules that depend on LLVM should depend on LLVM_CONFIG
LLVM_CONFIG_$(1):=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-config$$(X)
LLVM_MC_$(1):=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-mc$$(X)
LLVM_VERSION_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --version)
LLVM_BINDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --bindir)
LLVM_INCDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --includedir)
LLVM_LIBDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --libdir)
LLVM_LIBS_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --libs $$(LLVM_COMPONENTS))
LLVM_LDFLAGS_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --ldflags)
# On FreeBSD, it may search wrong headers (that are for pre-installed LLVM),
# so we replace -I with -iquote to ensure that it searches bundled LLVM first.
LLVM_CXXFLAGS_$(1)=$$(subst -I, -iquote , $$(shell "$$(LLVM_CONFIG_$(1))" --cxxflags))
LLVM_HOST_TRIPLE_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --host-target)

LLVM_AS_$(1)=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-as$$(X)
LLC_$(1)=$$(CFG_LLVM_INST_DIR_$(1))/bin/llc$$(X)

endef

$(foreach target,$(CFG_TARGET_TRIPLES), \
 $(eval $(call DEF_LLVM_VARS,$(target))))

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

# Note that any variable that re-configure should pick up needs to be
# exported

export CFG_SRC_DIR
export CFG_BUILD_DIR
export CFG_VERSION
export CFG_HOST_TRIPLE
export CFG_LLVM_ROOT
export CFG_ENABLE_MINGW_CROSS
export CFG_PREFIX
export CFG_LIBDIR

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

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

define SREQ
# $(1) is the stage number
# $(2) is the target triple
# $(3) is the host triple

# Destinations of artifacts for the host compiler
HROOT$(1)_H_$(3) = $(3)/stage$(1)
HBIN$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/bin
HLIB$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/$$(CFG_LIBDIR)

# Destinations of artifacts for target architectures
TROOT$(1)_T_$(2)_H_$(3) = $$(HLIB$(1)_H_$(3))/rustc/$(2)
TBIN$(1)_T_$(2)_H_$(3) = $$(TROOT$(1)_T_$(2)_H_$(3))/bin
TLIB$(1)_T_$(2)_H_$(3) = $$(TROOT$(1)_T_$(2)_H_$(3))/$$(CFG_LIBDIR)

# The name of the core and standard libraries used by rustc
ifdef CFG_DISABLE_SHAREDSTD
  HCORELIB_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/libcore.rlib
  TCORELIB_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/libcore.rlib

  HSTDLIB_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/libstd.rlib
  TSTDLIB_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/libstd.rlib

  HLIBRUSTC_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/librustc.rlib
  TLIBRUSTC_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/librustc.rlib
else
  HCORELIB_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/$(CFG_CORELIB)
  TCORELIB_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_CORELIB)

  HSTDLIB_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/$(CFG_STDLIB)
  TSTDLIB_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_STDLIB)

  HLIBRUSTC_DEFAULT$(1)_H_$(3) = \
    $$(HLIB$(1)_H_$(3))/$(CFG_LIBRUSTC)
  TLIBRUSTC_DEFAULT$(1)_T_$(2)_H_$(3) = \
    $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_LIBRUSTC)
endif

# Preqrequisites for using the stageN compiler
HSREQ$(1)_H_$(3) = \
$$(HBIN$(1)_H_$(3))/rustc$$(X) \
$$(HLIB$(1)_H_$(3))/$$(CFG_RUNTIME) \
$$(HLIB$(1)_H_$(3))/$$(CFG_RUSTLLVM) \
$$(HCORELIB_DEFAULT$(1)_H_$(3)) \
$$(HSTDLIB_DEFAULT$(1)_H_$(3)) \
$$(HLIBRUSTC_DEFAULT$(1)_H_$(3)) \
$$(MKFILE_DEPS)

# Prerequisites for using the stageN compiler to build target artifacts
TSREQ$(1)_T_$(2)_H_$(3) = \
$$(HSREQ$(1)_H_$(3)) \
$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_RUNTIME) \
$$(TLIB$(1)_T_$(2)_H_$(3))/libmorestack.a

# Prerequisites for complete stageN targets
SREQ$(1)_T_$(2)_H_$(3) = \
$$(TSREQ$(1)_T_$(2)_H_$(3)) \
$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_CORELIB) \
$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_STDLIB) \
$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC)

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

# Add RUSTFLAGS_STAGEN values to the build command
EXTRAFLAGS_STAGE$(1) = $$(RUSTFLAGS_STAGE$(1))

STAGE$(1)_T_$(2)_H_$(3) := \
$$(Q)$$(call CFG_RUN_TARG,$(1), \
$$(CFG_VALGRIND_COMPILE$(1)) \
$$(HBIN$(1)_H_$(3))/rustc$$(X) \
--cfg stage$(1) \
$$(CFG_RUSTC_FLAGS) $$(EXTRAFLAGS_STAGE$(1)) --target=$(2))

PERF_STAGE$(1)_T_$(2)_H_$(3) := \
$$(Q)$$(call CFG_RUN_TARG,$(1), \
$$(CFG_PERF_TOOL) \
$$(HBIN$(1)_H_$(3))/rustc$$(X) \
--cfg stage$(1) \
$$(CFG_RUSTC_FLAGS) $$(EXTRAFLAGS_STAGE$(1)) --target=$(2))

endef

$(foreach build,$(CFG_TARGET_TRIPLES), \
 $(eval $(foreach target,$(CFG_TARGET_TRIPLES), \
  $(eval $(foreach stage,$(STAGES), \
   $(eval $(call SREQ,$(stage),$(target),$(build))))))))

######################################################################
# rustc-H-targets
#
# Builds a functional Rustc for the given host.
######################################################################

define DEF_RUSTC_STAGE_TARGET
# $(1) == architecture
# $(2) == stage

rustc-stage$(2)-H-$(1): \
$$(foreach target,$$(CFG_TARGET_TRIPLES), \
$$(SREQ$(2)_T_$$(target)_H_$(1)))

endef

$(foreach host,$(CFG_TARGET_TRIPLES), \
 $(eval $(foreach stage,1 2 3, \
  $(eval $(call DEF_RUSTC_STAGE_TARGET,$(host),$(stage))))))

rustc-stage1: rustc-stage1-H-$(CFG_HOST_TRIPLE)
rustc-stage2: rustc-stage2-H-$(CFG_HOST_TRIPLE)
rustc-stage3: rustc-stage3-H-$(CFG_HOST_TRIPLE)

define DEF_RUSTC_TARGET
# $(1) == architecture

rustc-H-$(1): rustc-stage2-H-$(1)
endef

$(foreach host,$(CFG_TARGET_TRIPLES), \
 $(eval $(call DEF_RUSTC_TARGET,$(host))))

rustc-stage1: rustc-stage1-H-$(CFG_HOST_TRIPLE)
rustc-stage2: rustc-stage2-H-$(CFG_HOST_TRIPLE)
rustc-stage3: rustc-stage3-H-$(CFG_HOST_TRIPLE)
rustc: rustc-H-$(CFG_HOST_TRIPLE)

rustc-H-all: $(foreach host,$(CFG_TARGET_TRIPLES),rustc-H-$(host))

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

.DEFAULT_GOAL := all

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: $(SREQ1$(CFG_HOST_TRIPLE)) $(GENERATED) docs

else

TSREQS := \
$(foreach target,$(CFG_TARGET_TRIPLES), \
$(SREQ3_T_$(target)_H_$(CFG_HOST_TRIPLE)))
FUZZ := $(HBIN2_H_$(CFG_HOST_TRIPLE))/fuzzer$(X)
CARGO := $(HBIN2_H_$(CFG_HOST_TRIPLE))/cargo$(X)
RUSTDOC := $(HBIN2_H_$(CFG_HOST_TRIPLE))/rustdoc$(X)

all: rustc $(GENERATED) docs $(FUZZ) $(CARGO) $(RUSTDOC)

endif


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

ifndef CFG_DISABLE_MANAGE_SUBMODULES
# This is a pretty expensive operation but I don't see any way to avoid it
NEED_GIT_RECONFIG=$(shell cd "$(CFG_SRC_DIR)" && "$(CFG_GIT)" submodule status | grep -c '^\(+\|-\)')
else
NEED_GIT_RECONFIG=0
endif

ifeq ($(NEED_GIT_RECONFIG),0)
else
# If the submodules have changed then always execute config.mk
.PHONY: config.stamp
endif

Makefile config.mk: config.stamp

config.stamp: $(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/target.mk
include $(CFG_SRC_DIR)mk/host.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/tools.mk
include $(CFG_SRC_DIR)mk/docs.mk
include $(CFG_SRC_DIR)mk/llvm.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

ifneq ($(findstring install,$(MAKECMDGOALS)),)
  ifdef DESTDIR
    CFG_INFO := $(info cfg: setting CFG_PREFIX via DESTDIR, $(DESTDIR))
    CFG_PREFIX:=$(DESTDIR)
    export CFG_PREFIX
  endif

  CFG_INFO := $(info cfg: including install rules)
  include $(CFG_SRC_DIR)mk/install.mk
endif

ifneq ($(strip $(findstring TAGS.emacs,$(MAKECMDGOALS)) \
               $(findstring TAGS.vi,$(MAKECMDGOALS))),)
  CFG_INFO := $(info cfg: including ctags rules)
  include $(CFG_SRC_DIR)mk/ctags.mk
endif

# Find all of the .d files and include them to add information about
# header file dependencies.
ALL_DEP_FILES := $(ALL_OBJ_FILES:%.o=%.d)
-include $(ALL_DEP_FILES)
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