# -*- makefile -*- : Force emacs to use Makefile mode
#
# This file contains various boring housekeeping functions that would
# otherwise seriously clutter up the main Makefile.

###############################################################################
#
# Find a usable "echo -e" substitute.
#
TAB 			:= $(shell $(PRINTF) '\t')
ECHO_E_ECHO		:= $(ECHO)
ECHO_E_ECHO_E		:= $(ECHO) -e
ECHO_E_BIN_ECHO 	:= /bin/echo
ECHO_E_BIN_ECHO_E 	:= /bin/echo -e
ECHO_E_ECHO_TAB		:= $(shell $(ECHO_E_ECHO) '\t' | cat)
ECHO_E_ECHO_E_TAB	:= $(shell $(ECHO_E_ECHO_E) '\t' | cat)
ECHO_E_BIN_ECHO_TAB 	:= $(shell $(ECHO_E_BIN_ECHO) '\t')
ECHO_E_BIN_ECHO_E_TAB 	:= $(shell $(ECHO_E_BIN_ECHO_E) '\t')

ifeq ($(ECHO_E_ECHO_TAB),$(TAB))
ECHO_E		:= $(ECHO_E_ECHO)
endif
ifeq ($(ECHO_E_ECHO_E_TAB),$(TAB))
ECHO_E		:= $(ECHO_E_ECHO_E)
endif
ifeq ($(ECHO_E_BIN_ECHO_TAB),$(TAB))
ECHO_E		:= $(ECHO_E_BIN_ECHO)
endif
ifeq ($(ECHO_E_BIN_ECHO_E_TAB),$(TAB))
ECHO_E		:= $(ECHO_E_BIN_ECHO_E)
endif

.echocheck :
ifdef ECHO_E
	@$(TOUCH) $@
else
	@$(PRINTF) '%24s : x%sx\n' 'tab' '$(TAB)'
	@$(PRINTF) '%24s : x%sx\n' '"$(ECHO_E_ECHO) \t"' \
				    '$(ECHO_E_ECHO_TAB)'
	@$(PRINTF) '%24s : x%sx\n' '"$(ECHO_E_ECHO_E) \t"' \
				    '$(ECHO_E_ECHO_E_TAB)'
	@$(PRINTF) '%24s : x%sx\n' '"$(ECHO_E_BIN_ECHO) \t"' \
				    '$(ECHO_E_BIN_ECHO_TAB)'
	@$(PRINTF) '%24s : x%sx\n' '"$(ECHO_E_BIN_ECHO_E) \t"' \
				    '$(ECHO_E_BIN_ECHO_E_TAB)'
	@$(ECHO) "No usable \"echo -e\" substitute found"
	@exit 1
endif
MAKEDEPS	+= .echocheck
VERYCLEANUP	+= .echocheck

echo :
	@$(ECHO) "Using \"$(ECHO_E)\" for \"echo -e\""

###############################################################################
#
# Generate a usable "seq" substitute
#
define seq
	$(shell awk 'BEGIN { for ( i = $(1) ; i <= $(2) ; i++ ) print i }')
endef

###############################################################################
#
# Determine host OS
#
HOST_OS		:= $(shell uname -s)
hostos :
	@$(ECHO) $(HOST_OS)

###############################################################################
#
# Determine compiler

CCDEFS		:= $(shell $(CC) -E -x c -c /dev/null -dM | cut -d" " -f2)
ccdefs:
	@$(ECHO) $(CCDEFS)

ifeq ($(filter __GNUC__,$(CCDEFS)),__GNUC__)
CCTYPE		:= gcc
endif
cctype:
	@$(ECHO) $(CCTYPE)

###############################################################################
#
# Check for tools that can cause failed builds
#

ifeq ($(CCTYPE),gcc)
GCC_2_96_BANNER := $(shell $(CC) -v 2>&1 | grep -is 'gcc version 2\.96')
ifneq ($(GCC_2_96_BANNER),)
$(warning gcc 2.96 is unsuitable for compiling iPXE)
$(warning Use gcc 2.95 or a newer version instead)
$(error Unsuitable build environment found)
endif
endif

PERL_UNICODE_CHECK := $(shell $(PERL) -e 'use bytes; print chr(255)' | wc -c)
ifeq ($(PERL_UNICODE_CHECK),2)
$(warning Your Perl version has a Unicode handling bug)
$(warning Execute this command before building iPXE:)
$(warning export LANG=$${LANG%.UTF-8})
$(error Unsuitable build environment found)
endif

LD_GOLD_BANNER := $(shell $(LD) -v 2>&1 | grep 'GNU gold')
ifneq ($(LD_GOLD_BANNER),)
$(warning GNU gold is unsuitable for building iPXE)
$(warning Use GNU ld instead)
$(error Unsuitable build environment found)
endif

OBJCOPY_ETC_BANNER := $(shell $(OBJCOPY) --version | grep 'elftoolchain')
ifneq ($(OBJCOPY_ETC_BANNER),)
$(warning The elftoolchain objcopy is unsuitable for building iPXE)
$(warning Use binutils objcopy instead)
$(error Unsuitable build environment found)
endif

###############################################################################
#
# Check if $(eval ...) is available to use
#

HAVE_EVAL :=
ifndef NO_EVAL
$(eval HAVE_EVAL := yes)
endif
eval :
	@$(ECHO) $(HAVE_EVAL)

###############################################################################
#
# Check for various tool workarounds
#

WORKAROUND_CFLAGS :=
WORKAROUND_ASFLAGS :=
WORKAROUND_LDFLAGS :=

# Make syntax does not allow use of comma or space in certain places.
# This ugly workaround is suggested in the manual.
#
COMMA	:= ,
EMPTY	:=
SPACE	:= $(EMPTY) $(EMPTY)
HASH	:= \#
define NEWLINE


endef

# gcc 4.4 generates .eh_frame sections by default, which distort the
# output of "size".  Inhibit this.
#
ifeq ($(CCTYPE),gcc)
CFI_TEST = $(CC) -fno-dwarf2-cfi-asm -fno-exceptions -fno-unwind-tables \
		 -fno-asynchronous-unwind-tables -x c -c /dev/null \
		 -o /dev/null >/dev/null 2>&1
CFI_FLAGS := $(shell $(CFI_TEST) && \
	       $(ECHO) '-fno-dwarf2-cfi-asm -fno-exceptions ' \
		       '-fno-unwind-tables -fno-asynchronous-unwind-tables')
WORKAROUND_CFLAGS += $(CFI_FLAGS)
endif

# gcc 4.6 generates spurious warnings if -Waddress is in force.
# Inhibit this.
#
ifeq ($(CCTYPE),gcc)
WNA_TEST = $(CC) -Waddress -x c -c /dev/null -o /dev/null >/dev/null 2>&1
WNA_FLAGS := $(shell $(WNA_TEST) && $(ECHO) '-Wno-address')
WORKAROUND_CFLAGS += $(WNA_FLAGS)

# gcc 8.0 generates warnings for certain suspect string operations. Our
# sources have been vetted for correct usage.  Turn off these warnings.
#
WNST_TEST = $(CC) -Wstringop-truncation -x c -c /dev/null -o /dev/null \
		  >/dev/null 2>&1
WNST_FLAGS := $(shell $(WNST_TEST) && $(ECHO) '-Wno-stringop-truncation')
WORKAROUND_CFLAGS += $(WNST_FLAGS)

# gcc 9.1 generates warnings for taking address of packed member which
# may result in an unaligned pointer value.  Inhibit the warnings.
#
WNAPM_TEST = $(CC) -Wno-address-of-packed-member -x c -c /dev/null \
		   -o /dev/null >/dev/null 2>&1
WNAPM_FLAGS := $(shell $(WNAPM_TEST) && \
		 $(ECHO) '-Wno-address-of-packed-member')
WORKAROUND_CFLAGS += $(WNAPM_FLAGS)
endif

# Some versions of gas choke on division operators, treating them as
# comment markers.  Specifying --divide will work around this problem,
# but isn't available on older gas versions.
#
DIVIDE_TEST = $(AS) --divide /dev/null -o /dev/null 2>/dev/null
DIVIDE_FLAGS := $(shell $(DIVIDE_TEST) && $(ECHO) '--divide')
WORKAROUND_ASFLAGS += $(DIVIDE_FLAGS)

###############################################################################
#
# Build verbosity
#
ifeq ($(V),1)
Q :=
QM := @\#
else
Q := @
QM := @
endif

###############################################################################
#
# Checker
#
ifeq ($(C),1)
export REAL_CC := $(CC)
CC := cgcc
CFLAGS += -Wno-decl
endif

###############################################################################
#
# Set BIN according to whatever was specified on the command line as
# the build target.
#

# Determine how many different BIN directories are mentioned in the
# make goals.
#
BIN_GOALS	:= $(filter bin bin/% bin-%,$(MAKECMDGOALS))
BIN_GOALS_BINS	:= $(sort $(foreach BG,$(BIN_GOALS),\
				    $(firstword $(subst /, ,$(BG)))))
NUM_BINS	:= $(words $(BIN_GOALS_BINS))

ifeq ($(NUM_BINS),0)

# No BIN directory was specified.  Set BIN to "bin" as a sensible
# default.

BIN		:= bin

else # NUM_BINS == 0

ifeq ($(NUM_BINS),1)

# If exactly one BIN directory was specified, set BIN to match this
# directory.
#
BIN		:= $(firstword $(BIN_GOALS_BINS))

else # NUM_BINS == 1

# More than one BIN directory was specified.  We cannot handle the
# latter case within a single make invocation, so set up recursive
# targets for each BIN directory.  Use exactly one target for each BIN
# directory since running multiple make invocations within the same
# BIN directory is likely to cause problems.
#
# Leave $(BIN) undefined.  This has implications for any target that
# depends on $(BIN); such targets should be made conditional upon the
# existence of $(BIN).
#
BIN_GOALS_FIRST	:= $(foreach BGB,$(BIN_GOALS_BINS),\
			     $(firstword $(filter $(BGB)/%,$(BIN_GOALS))))
BIN_GOALS_OTHER	:= $(filter-out $(BIN_GOALS_FIRST),$(BIN_GOALS))

$(BIN_GOALS_FIRST) : % : BIN_RECURSE
	$(Q)$(MAKE) --no-print-directory BIN=$(firstword $(subst /, ,$@)) \
	    $(filter $(firstword $(subst /, ,$@))/%, $(BIN_GOALS))
$(BIN_GOALS_OTHER) : % : BIN_RECURSE
	$(Q)$(TRUE)
.PHONY : BIN_RECURSE

endif # NUM_BINS == 1
endif # NUM_BINS == 0

ifdef BIN

# Create $(BIN) directory if it doesn't exist yet
#
ifeq ($(wildcard $(BIN)),)
$(shell $(MKDIR) -p $(BIN))
endif

# Target to allow e.g. "make bin-efi arch"
#
$(BIN) :
	@# Do nothing, silently
.PHONY : $(BIN)

# Remove everything in $(BIN) for a "make clean"
#
CLEANUP	+= $(BIN)/*.* # Avoid picking up directories

endif # defined(BIN)

# Determine whether or not we need to include the dependency files
#
NO_DEP_TARGETS	:= $(BIN) clean veryclean
ifeq ($(MAKECMDGOALS),)
NEED_DEPS	:= 1
endif
ifneq ($(strip $(filter-out $(NO_DEP_TARGETS),$(MAKECMDGOALS))),)
NEED_DEPS	:= 1
endif

###############################################################################
#
# Select build architecture and platform based on $(BIN)
#
# BIN has the form bin[-[<arch>-]<platform>[-sb]]

ARCHS		:= $(patsubst arch/%,%,$(wildcard arch/*))
PLATFORMS	:= $(patsubst config/defaults/%.h,%,\
		     $(wildcard config/defaults/*.h))
archs :
	@$(ECHO) $(ARCHS)

platforms :
	@$(ECHO) $(PLATFORMS)

ifdef BIN

# Split $(BIN) into architecture, platform, and security flag (where present)
BIN_ELEMENTS	:= $(subst -,$(SPACE),$(BIN))
BIN_APS		:= $(wordlist 2,4,$(BIN_ELEMENTS))
ifeq ($(lastword $(BIN_APS)),sb)
BIN_AP		:= $(wordlist 2,$(words $(BIN_APS)),discard $(BIN_APS))
BIN_SECUREBOOT	:= 1
else
BIN_AP		:= $(BIN_APS)
BIN_SECUREBOOT	:= 0
endif
BIN_PLATFORM	:= $(lastword $(BIN_AP))
BIN_ARCH	:= $(wordlist 2,$(words $(BIN_AP)),discard $(BIN_AP))

# Determine build architecture
DEFAULT_ARCH	:= i386
ARCH		:= $(firstword $(BIN_ARCH) $(DEFAULT_ARCH))
CFLAGS		+= -DARCH=$(ARCH)
arch :
	@$(ECHO) $(ARCH)
.PHONY : arch

# Determine build platform
DEFAULT_PLATFORM := pcbios
PLATFORM	:= $(firstword $(BIN_PLATFORM) $(DEFAULT_PLATFORM))
CFLAGS		+= -DPLATFORM=$(PLATFORM) -DPLATFORM_$(PLATFORM)
platform :
	@$(ECHO) $(PLATFORM)

# Determine security flag
DEFAULT_SECUREBOOT := 0
SECUREBOOT	:= $(firstword $(BIN_SECUREBOOT) $(DEFAULT_SECUREBOOT))
CFLAGS		+= -DSECUREBOOT=$(SECUREBOOT)
secureboot :
	@$(ECHO) $(SECUREBOOT)

endif # defined(BIN)

# Include architecture-specific Makefile
ifdef ARCH
MAKEDEPS	+= arch/$(ARCH)/Makefile
include arch/$(ARCH)/Makefile
endif

# Include architecture-specific include path
ifdef ARCH
INCDIRS		+= arch/$(ARCH)/include
endif

###############################################################################
#
# Especially ugly workarounds

# Some widespread patched versions of gcc include -fPIE -Wl,-pie by
# default.  Note that gcc will exit *successfully* if it fails to
# recognise an option that starts with "no", so we have to test for
# output on stderr instead of checking the exit status.
#
# Current versions of gcc require -no-pie; older versions require
# -nopie.  We therefore test for both.
#
# This workaround must be determined only after the
# architecture-specific Makefile has been included, since some
# platforms (e.g. bin-x86_64-efi) will explicitly require the use of
# -fpie.
#
ifeq ($(filter -fpie,$(CFLAGS)),)
ifeq ($(CCTYPE),gcc)
PIE_TEST = [ -z "`$(CC) -fno-PIE -no-pie -x c -c /dev/null -o /dev/null 2>&1`" ]
PIE_FLAGS := $(shell $(PIE_TEST) && $(ECHO) '-fno-PIE -no-pie')
PIE_TEST2 = [ -z "`$(CC) -fno-PIE -nopie -x c -c /dev/null -o /dev/null 2>&1`" ]
PIE_FLAGS2 := $(shell $(PIE_TEST2) && $(ECHO) '-fno-PIE -nopie')
WORKAROUND_CFLAGS += $(PIE_FLAGS) $(PIE_FLAGS2)
endif
endif

# Some widespread patched versions of gcc include -fcf-protection=full
# by default.
#
ifeq ($(CCTYPE),gcc)
CFP_TEST = $(CC) -fcf-protection=none -x c -c /dev/null -o /dev/null \
		 >/dev/null 2>&1
CFP_FLAGS := $(shell $(CFP_TEST) && $(ECHO) '-fcf-protection=none')
WORKAROUND_CFLAGS += $(CFP_FLAGS)
endif

###############################################################################
#
# Source file handling

# Exclude known-insecure files from Secure Boot builds
ifeq ($(SECUREBOOT),0)
SRCDIRS		+= $(SRCDIRS_INSEC)
endif

# SRCDIRS lists all directories containing source files.
srcdirs :
	@$(ECHO) $(SRCDIRS)

# SRCS lists all .c or .S files found in any SRCDIR
#
SRCS	+= $(wildcard $(patsubst %,%/*.c,$(SRCDIRS)))
SRCS	+= $(wildcard $(patsubst %,%/*.S,$(SRCDIRS)))
srcs :
	@$(ECHO) $(SRCS)

# AUTO_SRCS lists all files in SRCS that are not mentioned in
# NON_AUTO_SRCS.  Files should be added to NON_AUTO_SRCS if they
# cannot be built using the standard build template.
#
AUTO_SRCS = $(filter-out $(NON_AUTO_SRCS),$(SRCS))
autosrcs :
	@$(ECHO) $(AUTO_SRCS)

# Just about everything else in this section depends upon having
# $(BIN) set

ifdef BIN

# INCDIRS lists the include path
incdirs :
	@$(ECHO) $(INCDIRS)

# Inhibit -fstack-protector (which is implicitly enabled in some
# patched gcc versions) unless explicitly mentioned in CFLAGS.
#
ifeq ($(findstring -fstack-protector,$(CFLAGS)),)
CFLAGS		+= -fno-stack-protector
endif

# Common flags
#
CFLAGS		+= $(foreach INC,$(INCDIRS),-I$(INC))
CFLAGS		+= -Os
CFLAGS		+= -g
ifeq ($(CCTYPE),gcc)
CFLAGS		+= -ffreestanding
CFLAGS		+= -fcommon
CFLAGS		+= -Wall -W -Wformat-nonliteral
CFLAGS		+= -Wno-array-bounds -Wno-dangling-pointer
HOST_CFLAGS	+= -Wall -W -Wformat-nonliteral
HOST_CFLAGS	+= -Wno-array-bounds -Wno-dangling-pointer
endif
CFLAGS		+= $(WORKAROUND_CFLAGS) $(EXTRA_CFLAGS)
ASFLAGS		+= $(WORKAROUND_ASFLAGS) $(EXTRA_ASFLAGS)
LDFLAGS		+= $(WORKAROUND_LDFLAGS) $(EXTRA_LDFLAGS)
HOST_CFLAGS	+= -O2 -g

# Inhibit -Werror if NO_WERROR is specified on make command line
#
ifneq ($(NO_WERROR),1)
CFLAGS		+= -Werror
ASFLAGS		+= --fatal-warnings
HOST_CFLAGS	+= -Werror
endif

# Enable per-item sections and section garbage collection.  Note that
# some older versions of gcc support -fdata-sections but treat it as
# implying -fno-common, which would break our build.  Some other older
# versions issue a spurious and uninhibitable warning if
# -ffunction-sections is used with -g, which would also break our
# build since we use -Werror.
#
ifeq ($(CCTYPE),gcc)
DS_TEST		= $(ECHO) 'char x;' | \
		  $(CC) -fdata-sections -S -x c - -o - 2>/dev/null | \
		  grep -E '\.comm' > /dev/null
DS_FLAGS	:= $(shell $(DS_TEST) && $(ECHO) '-fdata-sections')
FS_TEST		= $(CC) -ffunction-sections -g -c -x c /dev/null \
		  -o /dev/null 2>/dev/null
FS_FLAGS	:= $(shell $(FS_TEST) && $(ECHO) '-ffunction-sections')
CFLAGS		+= $(FS_FLAGS) $(DS_FLAGS)
endif
LDFLAGS		+= --gc-sections

# Force creation of static binaries (required for OpenBSD, does no
# harm on other platforms).
#
LDFLAGS		+= -static

# Use separate code segment if supported by linker
#
ZSC_TEST	= [ -z "`$(LD) -z separate-code --version 2>&1 > /dev/null`" ]
ZSC_FLAGS	:= $(shell $(ZSC_TEST) && \
		     $(ECHO) '-z separate-code -z max-page-size=4096')
LDFLAGS		+= $(ZSC_FLAGS)

# compiler.h is needed for our linking and debugging system
#
CFLAGS		+= -include include/compiler.h

# The section type character (e.g. "@" in "@progbits") varies by
# architecture.
#
CFLAGS		+= -DASM_TCHAR='$(ASM_TCHAR)' -DASM_TCHAR_OPS='$(ASM_TCHAR_OPS)'

# Inhibit the default -Dlinux
#
CFLAGS		+= -Ulinux

# CFLAGS for specific object types
#
CFLAGS_c	+=
CFLAGS_S 	+= -DASSEMBLY

# Base object name of the current target
#
OBJECT		= $(firstword $(subst ., ,$(@F)))

# CFLAGS for specific object files.  You can define
# e.g. CFLAGS_rtl8139, and have those flags automatically used when
# compiling bin/rtl8139.o.
#
OBJ_CFLAGS	= $(CFLAGS_$(OBJECT)) -DOBJECT=$(subst -,_,$(OBJECT))
$(BIN)/%.flags :
	@$(ECHO) $(OBJ_CFLAGS)

# Debug level calculations
#
DBGLVL_MAX	= -DDBGLVL_MAX=$(firstword $(subst ., ,$(1)))
DBGLVL_DFLT	= -DDBGLVL_DFLT=$(lastword $(subst ., ,$(1)))
DBGLVL		= $(call DBGLVL_MAX,$(1)) $(call DBGLVL_DFLT,$(1))

# Rules for specific object types.
#
COMPILE_c	= $(CC) $(CFLAGS) $(CFLAGS_c) $(OBJ_CFLAGS)
RULE_c		= $(Q)$(COMPILE_c) -c $< -o $@
RULE_c_to_ids.o = $(Q)$(ECHO_E) '$(OBJ_IDS_ASM_NL)' | $(ASSEMBLE_S) -o $@
RULE_c_to_dbg%.o= $(Q)$(COMPILE_c) $(call DBGLVL,$*) -c $< -o $@
RULE_c_to_c	= $(Q)$(COMPILE_c) -E -c $< > $@
RULE_c_to_s	= $(Q)$(COMPILE_c) -S -g0 -c $< -o $@

PREPROCESS_S	= $(CPP) $(CFLAGS) $(CFLAGS_S) $(OBJ_CFLAGS)
ASSEMBLE_S	= $(AS) $(ASFLAGS)
RULE_S		= $(Q)$(PREPROCESS_S) $< | $(ASSEMBLE_S) -o $@
RULE_S_to_dbg%.o= $(Q)$(PREPROCESS_S) $(call DBGLVL,$*) $< | $(ASSEMBLE_S) -o $@
RULE_S_to_s	= $(Q)$(PREPROCESS_S) $< > $@

GENERIC_TARGETS	+= ids.o dbg%.o c s

# List of embedded images included in the last build of embedded.o.
# This is needed in order to correctly rebuild embedded.o whenever the
# list of objects changes.
#
EMBED		:= $(EMBEDDED_IMAGE) # Maintain backwards compatibility
EMBEDDED_LIST	:= $(BIN)/.embedded.list
ifeq ($(wildcard $(EMBEDDED_LIST)),)
EMBED_OLD := <invalid>
else
EMBED_OLD := $(shell cat $(EMBEDDED_LIST))
endif
ifneq ($(EMBED_OLD),$(EMBED))
$(shell $(ECHO) "$(EMBED)" > $(EMBEDDED_LIST))
endif

$(EMBEDDED_LIST) : $(MAKEDEPS)

VERYCLEANUP	+= $(EMBEDDED_LIST)

EMBEDDED_FILES	:= $(subst $(COMMA), ,$(EMBED))
EMBED_ALL	:= $(foreach i,$(call seq,1,$(words $(EMBEDDED_FILES))),\
		     EMBED ( $(i), \"$(word $(i), $(EMBEDDED_FILES))\",\
			     \"$(notdir $(word $(i),$(EMBEDDED_FILES)))\" ))

embedded_DEPS += $(EMBEDDED_FILES) $(EMBEDDED_LIST)

CFLAGS_embedded = -DEMBED_ALL="$(EMBED_ALL)"

# List of trusted root certificates
#
TRUSTED_LIST	:= $(BIN)/.trusted.list
ifeq ($(wildcard $(TRUSTED_LIST)),)
TRUST_OLD := <invalid>
else
TRUST_OLD := $(shell cat $(TRUSTED_LIST))
endif
ifneq ($(TRUST_OLD),$(TRUST))
$(shell $(ECHO) "$(TRUST)" > $(TRUSTED_LIST))
endif

$(TRUSTED_LIST) : $(MAKEDEPS)

VERYCLEANUP	+= $(TRUSTED_LIST)

# Trusted root certificate fingerprints
#
TRUSTED_CERTS	:= $(subst $(COMMA), ,$(TRUST))
TRUSTED_FPS	:= $(foreach CERT,$(TRUSTED_CERTS),\
		     0x$(subst :,$(COMMA) 0x,$(lastword $(subst =, ,\
			 $(shell $(OPENSSL) x509 -in $(CERT) -noout -sha256 \
				 -fingerprint))))$(COMMA))

rootcert_DEPS += $(TRUSTED_FILES) $(TRUSTED_LIST)

CFLAGS_rootcert = $(if $(TRUSTED_FPS),-DTRUSTED="$(TRUSTED_FPS)")

# List of embedded certificates
#
CERT_LIST := $(BIN)/.certificate.list
ifeq ($(wildcard $(CERT_LIST)),)
CERT_OLD := <invalid>
else
CERT_OLD := $(shell cat $(CERT_LIST))
endif
ifneq ($(CERT_OLD),$(CERT))
$(shell $(ECHO) "$(CERT)" > $(CERT_LIST))
endif

$(CERT_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(CERT_LIST)

# Embedded certificates concatenated and then split into one file per
# certificate (even if original files contained certificate chains)
#
CERT_FILES := $(subst $(COMMA), ,$(CERT))
CERT_CONCAT := $(BIN)/.certificates.pem

ifneq ($(CERT),)

CERT_COUNT := $(shell grep "BEGIN CERTIFICATE" $(CERT_FILES) | wc -l)

$(CERT_CONCAT) : $(CERT_FILES) $(CERT_LIST)
	$(Q)cat $(CERT_FILES) > $@

# We must use an (otherwise unnecessary) pattern rule here to encode
# the fact that one "csplit" command generates multiple targets
CERT_PEMS := $(foreach i,$(call seq,1,$(CERT_COUNT)),\
	       $(BIN)/.certificate.pem.$(i))
$(subst .pem.,.%.,$(CERT_PEMS)) : $(BIN)/.certificates.%
	$(Q)$(CSPLIT) -q -n 1 -f $(BIN)/.certificate.pem. $< \
		'/BEGIN CERTIFICATE/' '{*}'

CERT_DERS := $(subst .certificate.pem.,.certificate.der.,$(CERT_PEMS))
$(BIN)/.certificate.der.% : $(BIN)/.certificate.pem.%
	$(Q)$(OPENSSL) x509 -in $< -outform DER -out $@

CERT_ALL := $(foreach i,$(call seq,1,$(CERT_COUNT)),\
	      CERT ( $(i), \"$(word $(i),$(CERT_DERS))\" ))

endif

certstore_DEPS += $(CERT_LIST) $(CERT_FILES) $(CERT_PEMS) $(CERT_DERS)

CFLAGS_certstore += -DCERT_ALL="$(CERT_ALL)"

CLEANUP += $(BIN)/.certificate.* $(BIN)/.certificates.*

# (Single-element) list of private keys
#
ifdef KEY
PRIVKEY	:= $(KEY) # Maintain backwards compatibility
endif
PRIVKEY_LIST := $(BIN)/.private_key.list
ifeq ($(wildcard $(PRIVKEY_LIST)),)
PRIVKEY_OLD := <invalid>
else
PRIVKEY_OLD := $(shell cat $(PRIVKEY_LIST))
endif
ifneq ($(PRIVKEY_OLD),$(PRIVKEY))
$(shell $(ECHO) "$(PRIVKEY)" > $(PRIVKEY_LIST))
endif

$(PRIVKEY_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(PRIVKEY_LIST)

# Embedded private key
#
PRIVKEY_INC := $(BIN)/.private_key.der

ifdef PRIVKEY
$(PRIVKEY_INC) : $(PRIVKEY) $(PRIVKEY_LIST)
	$(Q)$(OPENSSL) rsa -in $< -outform DER -out $@

privkey_DEPS += $(PRIVKEY_INC)
endif

CLEANUP += $(BIN)/.private_key.*

privkey_DEPS += $(PRIVKEY_LIST)

CFLAGS_privkey += $(if $(PRIVKEY),-DPRIVATE_KEY="\"$(PRIVKEY_INC)\"")

# (Single-element) list of named configurations
#
CONFIG_LIST := $(BIN)/.config.list
ifeq ($(wildcard $(CONFIG_LIST)),)
CONFIG_OLD := <invalid>
else
CONFIG_OLD := $(shell cat $(CONFIG_LIST))
endif
ifneq ($(CONFIG_OLD),$(CONFIG))
$(shell $(ECHO) "$(CONFIG)" > $(CONFIG_LIST))
endif

$(CONFIG_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(CONFIG_LIST)

# Named configurations
#
ifneq ($(CONFIG),)
ifneq ($(wildcard config/$(CONFIG)),)
CFLAGS	+= -DCONFIG=$(CONFIG)
endif
CFLAGS	+= -DLOCAL_CONFIG=$(CONFIG)
endif

config/named.h : $(CONFIG_LIST)
	$(Q)$(TOUCH) $@

.PRECIOUS : config/named.h

# (Single-element) list of assertion configuration
#
ASSERT_LIST := $(BIN)/.assert.list
ifeq ($(wildcard $(ASSERT_LIST)),)
ASSERT_OLD := <invalid>
else
ASSERT_OLD := $(shell cat $(ASSERT_LIST))
endif
ifneq ($(ASSERT_OLD),$(ASSERT))
$(shell $(ECHO) "$(ASSERT)" > $(ASSERT_LIST))
endif

$(ASSERT_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(ASSERT_LIST)

# Assertion configuration
#
ifneq ($(ASSERT),)
CFLAGS	+= -DASSERTING=$(ASSERT)
endif

include/assert.h : $(ASSERT_LIST)
	$(Q)$(TOUCH) $@

.PRECIOUS : include/assert.h

# (Single-element) list of profiling configuration
#
PROFILE_LIST := $(BIN)/.profile.list
ifeq ($(wildcard $(PROFILE_LIST)),)
PROFILE_OLD := <invalid>
else
PROFILE_OLD := $(shell cat $(PROFILE_LIST))
endif
ifneq ($(PROFILE_OLD),$(PROFILE))
$(shell $(ECHO) "$(PROFILE)" > $(PROFILE_LIST))
endif

$(PROFILE_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(PROFILE_LIST)

# Profiling configuration
#
ifneq ($(PROFILE),)
CFLAGS	+= -DPROFILING=$(PROFILE)
endif

include/ipxe/profile.h : $(PROFILE_LIST)
	$(Q)$(TOUCH) $@

.PRECIOUS : include/ipxe/profile.h

# (Single-element) list of function recorder configuration
#
FNREC_LIST := $(BIN)/.fnrec.list
ifeq ($(wildcard $(FNREC_LIST)),)
FNREC_OLD := <invalid>
else
FNREC_OLD := $(shell cat $(FNREC_LIST))
endif
ifneq ($(FNREC_OLD),$(FNREC))
$(shell $(ECHO) "$(FNREC)" > $(FNREC_LIST))
endif

$(FNREC_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(FNREC_LIST)

# Function recorder configuration
#
ifeq ($(FNREC),1)
# Enabling -finstrument-functions affects gcc's analysis and leads to spurious
# warnings about use of uninitialised variables.
#
CFLAGS		+= -Wno-uninitialized
CFLAGS		+= -finstrument-functions
CFLAGS		+= -finstrument-functions-exclude-file-list=core/fnrec.c
endif

include/compiler.h : $(FNREC_LIST)
	$(Q)$(TOUCH) $@

.PRECIOUS : include/compiler.h

# These files use .incbin inline assembly to include a binary file.
# Unfortunately ccache does not detect this dependency and caches
# builds even when the binary file has changed.
#
$(BIN)/embedded.% : override CC := env CCACHE_DISABLE=1 $(CC)
$(BIN)/certstore.% : override CC := env CCACHE_DISABLE=1 $(CC)
$(BIN)/privkey.% : override CC := env CCACHE_DISABLE=1 $(CC)

# Debug message autocolourisation range
#
DBGCOL_LIST	:= $(BIN)/.dbgcol.list
ifeq ($(wildcard $(DBGCOL_LIST)),)
DBGCOL_OLD := <invalid>
else
DBGCOL_OLD := $(shell cat $(DBGCOL_LIST))
endif
ifneq ($(DBGCOL_OLD),$(DBGCOL))
$(shell $(ECHO) "$(DBGCOL)" > $(DBGCOL_LIST))
endif

$(DBGCOL_LIST) : $(MAKEDEPS)

VERYCLEANUP += $(DBGCOL_LIST)

DBGCOL_COLOURS := $(subst -, ,$(DBGCOL))
DBGCOL_MIN := $(firstword $(DBGCOL_COLOURS))
DBGCOL_MAX := $(lastword $(DBGCOL_COLOURS))

debug_DEPS += $(DBGCOL_LIST)

CFLAGS_debug += $(if $(DBGCOL_MIN),-DDBGCOL_MIN=$(DBGCOL_MIN))
CFLAGS_debug += $(if $(DBGCOL_MAX),-DDBGCOL_MAX=$(DBGCOL_MAX))

# We automatically generate rules for any file mentioned in AUTO_SRCS
# using the following set of templates.  We use $(eval ...) if
# available, otherwise we generate separate Makefile fragments and
# include them.

# deps_template : generate dependency list for a given source file
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
#
define deps_template_file
$(call deps_template_parts,$(1),$(subst .,,$(suffix $(1))),$(basename $(notdir $(1))))
endef
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
# $(2) is the source type (e.g. "c")
# $(3) is the source base name (e.g. "rtl8139")
#
define deps_template_parts
	@$(ECHO) "  [DEPS] $(1)"
	@$(MKDIR) -p $(BIN)/deps/$(dir $(1))
	$(Q)$(CPP) $(CFLAGS) $(CFLAGS_$(2)) $(CFLAGS_$(3)) -DOBJECT=$(3) \
		-Wno-error -M $(1) -MG -MP | \
		sed 's/\.o[[:blank:]]*:/_DEPS +=/' > $(BIN)/deps/$(1).d
endef

# rules_template : generate rules for a given source file
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
#
define rules_template
$(call rules_template_parts,$(1),$(subst .,,$(suffix $(1))),$(basename $(notdir $(1))))
endef
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
# $(2) is the source type (e.g. "c")
# $(3) is the source base name (e.g. "rtl8139")
#
define rules_template_parts
$$(BIN)/$(3).o : $(1) $$(MAKEDEPS) $$($(3)_DEPS)
	$$(QM)$(ECHO) "  [BUILD] $$@"
	$$(RULE_$(2))
BOBJS += $$(BIN)/$(3).o
$(foreach TGT,$(GENERIC_TARGETS),$(if $(RULE_$(2)_to_$(TGT)),$(NEWLINE)$(call rules_template_target,$(1),$(2),$(3),$(TGT))))
$$(BIN)/deps/$(1).d : $$($(3)_DEPS)
TAGS : $$($(3)_DEPS)
endef
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
# $(2) is the source type (e.g. "c")
# $(3) is the source base name (e.g. "rtl8139")
# $(4) is the destination type (e.g. "dbg%.o")
#
define rules_template_target
$$(BIN)/$(3).$(4) : $(1) $$(MAKEDEPS) $$($(3)_DEPS)
	$$(QM)$(ECHO) "  [BUILD] $$@"
	$$(RULE_$(2)_to_$(4))
$(TGT)_OBJS += $$(BIN)/$(3).$(4)
endef
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
#
define rules_template_file
	@$(ECHO) "  [RULES] $(1)"
	@$(MKDIR) -p $(BIN)/rules/$(dir $(1))
	@$(ECHO_E) '$(subst $(NEWLINE),\n,$(call rules_template,$(1)))' \
		 > $(BIN)/rules/$(1).r
endef

# Generate the dependency files
#
$(BIN)/deps/%.d : % $(MAKEDEPS)
	$(call deps_template_file,$<)

# Calculate list of dependency files
#
AUTO_DEPS	= $(patsubst %,$(BIN)/deps/%.d,$(AUTO_SRCS) core/version.c)
autodeps :
	@$(ECHO) $(AUTO_DEPS)
VERYCLEANUP	+= $(BIN)/deps

# Include dependency files
#
ifdef NEED_DEPS
ifneq ($(AUTO_DEPS),)
-include $(AUTO_DEPS)
endif
endif

# Generate the rules files
#
$(BIN)/rules/%.r : % $(MAKEDEPS)
	$(call rules_template_file,$<)

# Calculate list of rules files
#
AUTO_RULES	= $(patsubst %,$(BIN)/rules/%.r,$(AUTO_SRCS))
autorules :
	@$(ECHO) $(AUTO_RULES)
VERYCLEANUP	+= $(BIN)/rules

# Evaluate rules (or include rules files)
#
ifdef NEED_DEPS
ifneq ($(AUTO_RULES),)
ifneq ($(HAVE_EVAL),)
$(foreach SRC,$(AUTO_SRCS),$(eval $(call rules_template,$(SRC))))
else
-include $(AUTO_RULES)
endif
endif
endif

# Files to be parsed using parserom.pl
#
ROM_SRCS	= $(foreach SRC,$(AUTO_SRCS),\
		    $(if $(findstring drivers/,$(SRC)),$(SRC)))
romsrcs :
	@$(ECHO) $(ROM_SRCS)

# List of files to be parsed using parserom.pl
#
ROM_SRCS_LIST	:= $(BIN)/.rom.list
ifeq ($(wildcard $(ROM_SRCS_LIST)),)
ROM_SRCS_OLD := <invalid>
else
ROM_SRCS_OLD := $(shell cat $(ROM_SRCS_LIST))
endif
ifneq ($(ROM_SRCS_OLD),$(ROM_SRCS))
$(shell $(ECHO) "$(ROM_SRCS)" > $(ROM_SRCS_LIST))
endif

$(ROM_SRCS_LIST) : $(MAKEDEPS)

VERYCLEANUP	+= $(ROM_SRCS_LIST)

# ROM definition file
#
ROMDEFS		= $(BIN)/.rom.defs
$(ROMDEFS) : $(ROM_SRCS) $(ROM_SRCS_LIST) $(PARSEROM) $(MAKEDEPS)
	$(QM)$(ECHO) "  [PARSEROM]"
	$(Q)$(PERL) $(PARSEROM) $(ROM_SRCS) > $@

VERYCLEANUP	+= $(ROMDEFS)

# Evaluate ROM definition file
ifdef NEED_DEPS
ifneq ($(ROM_SRCS),)
-include $(ROMDEFS)
endif
endif

# Device ID tables (using IDs from ROM definition file)
#
define obj_pci_id_asm
	.section ".pci_devlist.$(1)", "a", $(ASM_TCHAR)progbits
	.globl pci_devlist_$(1)
pci_devlist_$(1):
	.short ( 0x$(1) & 0xffff )

endef
define obj_isa_id_asm
endef
OBJ_IDS_ASM	= $(foreach ROM,$(ROMS_$(OBJECT)),$(call obj_$(ROM_TYPE_$(ROM))_id_asm,$(ROM)))
OBJ_IDS_ASM_NL	= $(subst $(NEWLINE),\n,$(OBJ_IDS_ASM))
$(BIN)/%.ids :
	@$(ECHO_E) '$(OBJ_IDS_ASM_NL)'

BOBJS	+= $(patsubst %,$(BIN)/%.ids.o,$(DRIVERS))

# The following variables are created by the autogenerated rules
#
bobjs :
	@$(ECHO) $(BOBJS)
drivers_% :
	@$(ECHO) $(DRIVERS_$*)
drivers :
	@$(ECHO) $(DRIVERS)
.PHONY : drivers
roms :
	@$(ECHO) $(ROMS)

# Generate error usage information
#
$(BIN)/%.einfo : $(BIN)/%.o
	$(QM)$(ECHO) "  [EINFO] $@"
	$(Q)$(OBJCOPY) -O binary -j .einfo --set-section-flags .einfo=alloc \
		$< $@

EINFOS		:= $(patsubst $(BIN)/%.o,$(BIN)/%.einfo,$(BOBJS))
$(BIN)/errors : $(EINFOS) $(EINFO)
	$(QM)$(ECHO) "  [EINFO] $@"
	$(Q)$(EINFO) $(EINFOS) | sort > $@
CLEANUP		+= $(BIN)/errors	# Doesn't match the $(BIN)/*.* pattern

# Generate the NIC file from the parsed source files.  The NIC file is
# only for rom-o-matic.
#
$(BIN)/NIC : $(AUTO_DEPS)
	@$(ECHO) '# This is an automatically generated file, do not edit' > $@
	@$(ECHO) '# It does not affect anything in the build, ' \
	     'it is only for rom-o-matic' >> $@
	@$(ECHO) >> $@
	@perl -ne 'chomp; print "$$1\n" if /\# NIC\t(.*)$$/' $^ >> $@
CLEANUP		+= $(BIN)/NIC	# Doesn't match the $(BIN)/*.* pattern

# Analyse a target name (e.g. "bin/dfe538--prism2_pci.rom.tmp") and
# derive the variables:
# 
# TGT_ELEMENTS : the elements of the target (e.g. "dfe538 prism2_pci")
# TGT_PREFIX   : the prefix type (e.g. "pcirom")
# TGT_DRIVERS  : the driver for each element (e.g. "rtl8139 prism2_pci")
# TGT_ROM_NAME : the ROM name (e.g. "dfe538")
#
TGT_ELEMENTS	= $(subst --, ,$(firstword $(subst ., ,$(notdir $@))))
TGT_ROM_NAME	= $(firstword $(TGT_ELEMENTS))
TGT_DRIVERS	= $(strip $(foreach TGT_ELEMENT,$(TGT_ELEMENTS), \
				    $(if $(DRIVERS_$(TGT_ELEMENT)), \
					 $(DRIVERS_$(TGT_ELEMENT)), \
					 $(firstword $(DRIVER_$(TGT_ELEMENT)) \
						     $(TGT_ELEMENT)))))
TGT_PREFIX_NAME	= $(word 2,$(subst ., ,$(notdir $@)))
TGT_PREFIX	= $(strip $(if $(filter rom,$(TGT_PREFIX_NAME)), \
			       $(ROM_TYPE_$(TGT_ROM_NAME))rom, \
			       $(TGT_PREFIX_NAME)))

# Look up ROM IDs for the current target
# (e.g. "bin/dfe538--prism2_pci.rom.tmp") and derive the variables:
#
# TGT_PCI_VENDOR : the PCI vendor ID (e.g. "0x1186")
# TGT_PCI_DEVICE : the PCI device ID (e.g. "0x1300")
#
TGT_PCI_VENDOR	= $(PCI_VENDOR_$(TGT_ROM_NAME))
TGT_PCI_DEVICE	= $(PCI_DEVICE_$(TGT_ROM_NAME))

# Calculate link-time options for the current target
# (e.g. "bin/dfe538--prism2_pci.rom.tmp") and derive the variables:
#
# TGT_LD_DRIVERS : symbols to require in order to drag in the relevant drivers
#		   (e.g. "obj_rtl8139 obj_prism2_pci")
# TGT_LD_IDS :     symbols to define in order to fill in ID structures in the
#		   ROM header (e.g."pci_vendor_id=0x1186 pci_device_id=0x1300")
#
TGT_LD_DRIVERS	= $(subst -,_,$(patsubst %,obj_%,$(TGT_DRIVERS)))
TGT_LD_IDS	= pci_vendor_id=$(firstword $(TGT_PCI_VENDOR) 0) \
		  pci_device_id=$(firstword $(TGT_PCI_DEVICE) 0)
TGT_LD_DEVLIST	= $(foreach ELEM,$(TGT_ELEMENTS),$(if $(PCI_VENDOR_$(ELEM)),\
		    pci_devlist_$(patsubst 0x%,%,$(PCI_VENDOR_$(ELEM)))$(patsubst 0x%,%,$(PCI_DEVICE_$(ELEM)))))
TGT_LD_ENTRY	= _$(TGT_PREFIX)_start

# Calculate linker flags based on link-time options for the current
# target type (e.g. "bin/dfe538--prism2_pci.rom.tmp") and derive the
# variables:
#
# TGT_LD_FLAGS : target-specific flags to pass to linker (e.g.
#		 "-u obj_zpciprefix -u obj_rtl8139 -u obj_prism2_pci
#		  --defsym pci_vendor=0x1186 --defsym pci_device=0x1300")
#
TGT_LD_FLAGS	= $(foreach SYM,$(TGT_LD_ENTRY) $(TGT_LD_DRIVERS) \
		    $(TGT_LD_DEVLIST) obj_config obj_config_$(PLATFORM),\
		    -u $(SYMBOL_PREFIX)$(SYM) \
		    --defsym check_$(SYM)=$(SYMBOL_PREFIX)$(SYM) ) \
		  $(patsubst %,--defsym %,$(TGT_LD_IDS)) \
		  -e $(SYMBOL_PREFIX)$(TGT_LD_ENTRY)

# Calculate list of debugging versions of objects to be included in
# the target.
#
DEBUG_LIST	= $(subst $(COMMA), ,$(DEBUG))
DEBUG_MAX	= $(firstword $(word 2,$(subst :, ,$(1))) 1)
DEBUG_DFLT	= $(if $(word 3,$(subst :, ,$(1))),.$(word 3,$(subst :, ,$(1))))
DEBUG_LEVEL	= $(call DEBUG_MAX,$(1))$(call DEBUG_DFLT,$(1))
DEBUG_BASE	= $(firstword $(subst :, ,$(1))).dbg$(call DEBUG_LEVEL,$(1))
DEBUG_OBJ	= $(BIN)/$(call DEBUG_BASE,$(1)).o
DEBUG_ORIG_OBJ	= $(BIN)/$(firstword $(subst :, ,$(1))).o
DEBUG_OBJS	= $(foreach D,$(DEBUG_LIST),$(call DEBUG_OBJ,$(D)))
DEBUG_ORIG_OBJS	= $(foreach D,$(DEBUG_LIST),$(call DEBUG_ORIG_OBJ,$(D)))
BLIB_OBJS	= $(DEBUG_OBJS) $(filter-out $(DEBUG_ORIG_OBJS),$(BOBJS))

# Print out all derived information for a given target.
#
$(BIN)/%.info :
	@$(ECHO) 'Elements             : $(TGT_ELEMENTS)'
	@$(ECHO) 'Prefix               : $(TGT_PREFIX)'
	@$(ECHO) 'Drivers              : $(TGT_DRIVERS)'
	@$(ECHO) 'ROM name             : $(TGT_ROM_NAME)'
	@$(ECHO)
	@$(ECHO) 'PCI vendor           : $(TGT_PCI_VENDOR)'
	@$(ECHO) 'PCI device           : $(TGT_PCI_DEVICE)'
	@$(ECHO)
	@$(ECHO) 'LD driver symbols    : $(TGT_LD_DRIVERS)'
	@$(ECHO) 'LD ID symbols        : $(TGT_LD_IDS)'
	@$(ECHO) 'LD devlist symbols   : $(TGT_LD_DEVLIST)'
	@$(ECHO) 'LD entry point       : $(TGT_LD_ENTRY)'
	@$(ECHO)
	@$(ECHO) 'LD target flags      : $(TGT_LD_FLAGS)'
	@$(ECHO)
	@$(ECHO) 'Debugging objects    : $(DEBUG_OBJS)'
	@$(ECHO) 'Replaced objects     : $(DEBUG_ORIG_OBJS)'

# List of objects included in the last build of blib.  This is needed
# in order to correctly rebuild blib whenever the list of objects
# changes.
#
BLIB_LIST	:= $(BIN)/.blib.list
ifeq ($(wildcard $(BLIB_LIST)),)
BLIB_OBJS_OLD	:= <invalid>
else
BLIB_OBJS_OLD	:= $(shell cat $(BLIB_LIST))
endif
ifneq ($(BLIB_OBJS_OLD),$(BLIB_OBJS))
$(shell $(ECHO) "$(BLIB_OBJS)" > $(BLIB_LIST))
endif

$(BLIB_LIST) : $(MAKEDEPS)

VERYCLEANUP	+= $(BLIB_LIST)

# Library of all objects
#
BLIB		= $(BIN)/blib.a
$(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
	$(Q)$(RM) $(BLIB)
	$(QM)$(ECHO) "  [AR] $@"
	$(Q)$(AR) rD $@ $(sort $(BLIB_OBJS))
	$(Q)$(OBJCOPY) --enable-deterministic-archives \
		       --prefix-symbols=$(SYMBOL_PREFIX) $@
	$(Q)$(RANLIB) -D $@
blib : $(BLIB)

# Command to generate build ID.  Must be unique for each $(BIN)/%.tmp,
# even within the same build run.
#
# The build ID is supposed to be collision-free across all ROMs that
# might ever end up installed in the same system.  It doesn't just
# disambiguate targets within a single build; it also disambiguates
# different builds (such as builds for multiple ROMs all built from
# the same blib.a).
#
BUILD_ID_CMD = cat $^ | cksum | awk '{print $$1}'

# Build timestamp
#
# Used as a means to automatically select the newest version of iPXE
# if multiple iPXE drivers are loaded concurrently in a UEFI system.
#
# It gets rounded down to the nearest minute when used for this
# purpose.
#
ifdef SOURCE_DATE_EPOCH
BUILD_TIMESTAMP := $(SOURCE_DATE_EPOCH)
else ifdef GITVERSION
BUILD_TIMESTAMP := $(shell git log -1 --pretty=%ct)
else
BUILD_TIMESTAMP := $(shell date +%s)
endif

# Build version
#
GIT_INDEX := $(if $(GITVERSION),$(if $(wildcard ../.git/index),../.git/index))
$(BIN)/version.%.o : core/version.c $(MAKEDEPS) $(version_DEPS) $(GIT_INDEX)
	$(QM)$(ECHO) "  [VERSION] $@"
	$(Q)$(COMPILE_c) -DBUILD_NAME="\"$*\"" \
		-DVERSION_MAJOR=$(VERSION_MAJOR) \
		-DVERSION_MINOR=$(VERSION_MINOR) \
		-DVERSION_PATCH=$(VERSION_PATCH) \
		-DVERSION="\"$(VERSION)\"" \
		-c $< -o $@
	$(Q)$(OBJCOPY) --prefix-symbols=$(SYMBOL_PREFIX) $@

# Build an intermediate object file from the objects required for the
# specified target.
#
$(BIN)/%.tmp : $(BIN)/version.%.o $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
	$(QM)$(ECHO) "  [LD] $@"
	$(Q)$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $< $(BLIB) -o $@ \
		--defsym _build_id=$(shell $(BUILD_ID_CMD)) \
		--defsym _build_timestamp=$(BUILD_TIMESTAMP) \
		-Map $(BIN)/$*.tmp.map
	$(Q)$(OBJDUMP) -ht $@ | $(PERL) $(SORTOBJDUMP) >> $(BIN)/$*.tmp.map

# Keep intermediate object file (useful for debugging)
.PRECIOUS : $(BIN)/%.tmp

# Show a linker map for the specified target
#
$(BIN)/%.map : $(BIN)/%.tmp
	@less $(BIN)/$*.tmp.map

# Get objects list for the specified target
#
define objs_list
	$(sort $(foreach OBJ_SYMBOL,\
		 $(filter obj_%,$(shell $(NM) $(1) | cut -d" " -f3)),\
		 $(patsubst obj_%,%,$(OBJ_SYMBOL))))
endef
$(BIN)/%.objs : $(BIN)/%.tmp
	$(Q)$(ECHO) $(call objs_list,$<)
$(BIN)/%.sizes : $(BIN)/%.tmp
	$(Q)$(SIZE) -t $(foreach OBJ,$(call objs_list,$<),$(wildcard $(BIN)/$(subst _,?,$(OBJ)).o)) | \
		sort -g

# Get dependency list for the specified target
#
define deps_list
	$(sort $(foreach OBJ,$(call objs_list,$(1)),$($(OBJ)_DEPS)))
endef
$(BIN)/%.deps : $(BIN)/%.tmp
	$(Q)$(ECHO) $(call deps_list,$<)

# Get unneeded source files for the specified target
#
define nodeps_list
	$(sort $(filter-out $(call deps_list,$(1)),\
		 $(foreach BOBJ,$(BOBJS),\
		   $($(basename $(notdir $(BOBJ)))_DEPS))))
endef
$(BIN)/%.nodeps : $(BIN)/%.tmp
	$(Q)$(ECHO) $(call nodeps_list,$<)

# Get licensing verdict for the specified target
#
define licensable_deps_list
	$(filter-out config/local/%.h,\
	  $(filter-out $(BIN)/.%.list,\
	    $(call deps_list,$(1))))
endef
define unlicensed_deps_list
	$(shell grep -L FILE_LICENCE $(call licensable_deps_list,$(1)))
endef
define licence_list
	$(sort $(foreach LICENCE,\
		 $(filter __licence__%,$(shell $(NM) $(1) | cut -d" " -f3)),\
		 $(word 2,$(subst __, ,$(LICENCE)))))
endef
$(BIN)/%.licence_list : $(BIN)/%.tmp
	$(Q)$(ECHO) $(call licence_list,$<)
$(BIN)/%.licence : $(BIN)/%.tmp
	$(QM)$(ECHO) "  [LICENCE] $@"
	$(Q)$(if $(strip $(call unlicensed_deps_list,$<)),\
		echo -n "Unable to determine licence because the following " ;\
		echo "files are missing a licence declaration:" ;\
		echo $(call unlicensed_deps_list,$<);\
		exit 1,\
		$(PERL) $(LICENCE) $(call licence_list,$<))

# Extract compression information from intermediate object file
#
$(BIN)/%.zinfo : $(BIN)/%.tmp
	$(QM)$(ECHO) "  [ZINFO] $@"
	$(Q)$(OBJCOPY) -O binary -j .zinfo $< $@

# Build raw binary file from intermediate object file
#
$(BIN)/%.bin : $(BIN)/%.tmp
	$(QM)$(ECHO) "  [BIN] $@"
	$(Q)$(OBJCOPY) -O binary -R .zinfo $< $@

# Compress raw binary file
#
$(BIN)/%.zbin : $(BIN)/%.bin $(BIN)/%.zinfo $(ZBIN)
	$(QM)$(ECHO) "  [ZBIN] $@"
	$(Q)$(ZBIN) $(BIN)/$*.bin $(BIN)/$*.zinfo > $@

# Rules for each media format.  These are generated and placed in an
# external Makefile fragment.  We could do this via $(eval ...), but
# that would require make >= 3.80.
# 
# Note that there's an alternative way to generate most .rom images:
# they can be copied from their 'master' ROM image using cp and
# reprocessed with makerom to add the PCI IDs and ident string.  The
# relevant rule would look something like:
#
#   $(BIN)/dfe538%rom : $(BIN)/rtl8139%rom
#	cat $< $@
#	$(FINALISE_rom)
# 
# You can derive the ROM/driver relationships using the variables
# DRIVER_<rom> and/or ROMS_<driver>.
# 
# We don't currently do this, because (a) it would require generating
# yet more Makefile fragments (since you need a rule for each ROM in
# ROMS), and (b) the linker is so fast that it probably wouldn't make
# much difference to the overall build time.

# Add NON_AUTO_MEDIA to the media list, so that they show up in the
# output of "make"
#
MEDIA		+= $(NON_AUTO_MEDIA)

media :
	@$(ECHO) $(MEDIA)

AUTO_MEDIA	= $(filter-out $(NON_AUTO_MEDIA),$(MEDIA))
automedia :
	@$(ECHO) $(AUTO_MEDIA)

# media_template : create media rules
#
# $(1) is the media name (e.g. "rom")
#
define media_template
$(if $(filter $(1),$(AUTO_MEDIA)),$(call auto_media_template,$(1)))
LIST_$(1) := $$(if $$(LIST_NAME_$(1)),$$($$(LIST_NAME_$(1))),$$(DRIVERS))
ALL_$(1) = $$(foreach ITEM,$$(LIST_$(1)),$$(BIN)/$$(ITEM).$(1))
$$(BIN)/all$(1)s : $$(ALL_$(1))
$$(BIN)/allall : $$(BIN)/all$(1)s
all$(1)s : $$(BIN)/all$(1)s
allall : $$(BIN)/allall
endef
#
# $(1) is the media name (e.g. "rom")
#
define auto_media_template
$$(BIN)/%.$(1) : $$(BIN)/%.$(1).zbin
	$$(QM)echo "  [FINISH] $$@"
	$$(Q)$$(CP) $$< $$@
	$$(Q)$$(if $$(PAD_$(1)),$$(PAD_$(1)) $$@)
	$$(Q)$$(if $$(FINALISE_$(1)),$$(FINALISE_$(1)) $$@)
endef
#
# $(1) is the media name (e.g. "rom")
#
define media_template_file
	@$(ECHO) "  [MEDIARULES] $(1)"
	@$(MKDIR) -p $(BIN)/rules/$(dir $(1))
	@$(ECHO_E) '$(subst $(NEWLINE),\n,$(call media_template,$(1)))' \
		> $(BIN)/rules/$(1).media.r
endef

# Generate media rules files
#
$(BIN)/rules/%.media.r : $(MAKEDEPS)
	$(call media_template_file,$*)

# Calculate list of media rules files
#
MEDIA_RULES		= $(patsubst %,$(BIN)/rules/%.media.r,$(MEDIA))
mediarules :
	@$(ECHO) $(MEDIA_RULES)

# Evaluate media rules (or include media rules files)
#
ifdef NEED_DEPS
ifneq ($(MEDIA_RULES),)
ifneq ($(HAVE_EVAL),)
$(foreach MEDIUM,$(MEDIA),$(eval $(call media_template,$(MEDIUM))))
else
-include $(MEDIA_RULES)
endif
endif
endif

# Alias for ipxe.%
#
$(BIN)/etherboot.% : $(BIN)/ipxe.%
	ln -sf $(notdir $<) $@

endif # defined(BIN)

###############################################################################
#
# The compression utilities
#

ZBIN_LDFLAGS := -llzma

$(ZBIN) : util/zbin.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) $< $(ZBIN_LDFLAGS) -o $@
CLEANUP += $(ZBIN)

###############################################################################
#
# The EFI image converter
#

$(ELF2EFI32) : util/elf2efi.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -DEFI_TARGET32 $< -o $@
CLEANUP += $(ELF2EFI32)

$(ELF2EFI64) : util/elf2efi.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -DEFI_TARGET64 $< -o $@
CLEANUP += $(ELF2EFI64)

$(EFIROM) : util/efirom.c util/eficompress.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -o $@ $<
CLEANUP += $(EFIROM)

$(EFIFATBIN) : util/efifatbin.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -o $@ $<
CLEANUP += $(EFIFATBIN)

###############################################################################
#
# The error usage information utility
#
$(EINFO) : util/einfo.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -o $@ $<
CLEANUP += $(EINFO)

###############################################################################
#
# Local configs
#
CONFIG_HEADERS := $(patsubst config/%,%,$(wildcard config/*.h))
CONFIG_LOCAL_HEADERS := $(foreach HEADER,$(CONFIG_HEADERS),\
				  config/local/$(HEADER))

$(CONFIG_LOCAL_HEADERS) :
	$(Q)$(TOUCH) $@

.PRECIOUS : $(CONFIG_LOCAL_HEADERS)

ifneq ($(CONFIG),)

CONFIG_LOCAL_NAMED_HEADERS := $(foreach HEADER,$(CONFIG_HEADERS),\
					config/local/$(CONFIG)/$(HEADER))

$(CONFIG_LOCAL_NAMED_HEADERS) :
	$(Q)$(MKDIR) -p $(dir $@)
	$(Q)$(TOUCH) $@

.PRECIOUS : $(CONFIG_LOCAL_NAMED_HEADERS)

endif

###############################################################################
#
# Build the TAGS file(s) for emacs
#
TAGS :
	ctags -e -R -f $@ --exclude=bin

CLEANUP	+= TAGS

###############################################################################
#
# Force rebuild for any given target
#
%.rebuild :
	rm -f $*
	$(Q)$(MAKE) $*

###############################################################################
#
# Symbol table checks
#

ifdef BIN

SYMTAB	= $(BIN)/symtab
$(SYMTAB) : $(BLIB)
	$(OBJDUMP) -w -t $< > $@

CLEANUP	+= $(BIN)/symtab

symcheck : $(SYMTAB)
	$(PERL) $(SYMCHECK) $<

endif # defined(BIN)

###############################################################################
#
# Build bochs symbol table
#

ifdef BIN

$(BIN)/%.bxs : $(BIN)/%.tmp
	$(NM) $< | cut -d" " -f1,3 > $@

endif # defined(BIN)

###############################################################################
#
# Documentation
#

ifdef BIN

$(BIN)/doxygen.cfg : doxygen.cfg $(MAKEDEPS)
	$(Q)$(PERL) -pe 's{\@SRCDIRS\@}{$(SRCDIRS)}; ' \
		-e  's{\@INCDIRS\@}{$(filter-out .,$(INCDIRS))}; ' \
		-e  's{\@BIN\@}{$(BIN)}; ' \
		-e  's{\@ARCH\@}{$(ARCH)}; ' \
		$< > $@

$(BIN)/doc : $(BIN)/doxygen.cfg
	$(Q)$(DOXYGEN) $<

.PHONY : $(BIN)/doc

doc : $(BIN)/doc

doc-clean :
	$(Q)$(RM) -r $(BIN)/doc

VERYCLEANUP	+= $(BIN)/doc

docview :
	@[ -f $(BIN)/doc/html/index.html ] || $(MAKE) $(BIN)/doc
	@if [ -n "$$BROWSER" ] ; then \
		( $$BROWSER $(BIN)/doc/html/index.html & ) ; \
	else \
		$(ECHO) "Documentation index in $(BIN)/doc/html/index.html" ; \
	fi

endif # defined(BIN)

###############################################################################
#
# Keyboard maps
#

hci/keymap/keymap_%.c :
	$(Q)$(PYTHON) $(GENKEYMAP) $* > $@

###############################################################################
#
# Force deletion of incomplete targets
#

.DELETE_ON_ERROR :

###############################################################################
#
# Clean-up
#

ifeq ($(NUM_BINS),0)
ALLBINS		:= bin bin-*
ALLBIN		= $(foreach B,$(ALLBINS),$(patsubst $(BIN)/%,$(B)/%,$(1)))
CLEANUP		:= $(foreach C,$(CLEANUP),$(call ALLBIN,$(C)))
VERYCLEANUP	:= $(foreach V,$(VERYCLEANUP),$(call ALLBIN,$(V)))
endif

clean :
	$(RM) -r $(CLEANUP)

veryclean : clean
	$(RM) -r $(VERYCLEANUP)