path: root/src/Makefile.housekeeping

# -*- 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 ($(filter __ICC,$(CCDEFS)),__ICC)
CCTYPE		:= icc
else
CCTYPE		:= gcc
endif
cctype:
	@$(ECHO) $(CCTYPE)

###############################################################################
#
# Check for tools that can cause failed builds
#
.toolcheck :
	@if $(CC) -v 2>&1 | grep -is 'gcc version 2\.96' > /dev/null; then \
		$(ECHO) 'gcc 2.96 is unsuitable for compiling Etherboot'; \
		$(ECHO) 'Use gcc 2.95 or gcc 3.x instead'; \
		exit 1; \
	fi
	@if [ `perl -e 'use bytes; print chr(255)' | wc -c` = 2 ]; then \
		$(ECHO) 'Your Perl version has a Unicode handling bug'; \
		$(ECHO) 'Execute this command before compiling Etherboot:'; \
		$(ECHO) 'export LANG=$${LANG%.UTF-8}'; \
		exit 1; \
	fi
	@$(TOUCH) $@
MAKEDEPS	+= .toolcheck
VERYCLEANUP	+= .toolcheck

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

# 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)

# Check for an old version of gas (binutils 2.9.1)
#
OLDGAS	:= $(shell $(AS) --version | grep -q '2\.9\.1' && $(ECHO) -DGAS291)
CFLAGS	+= $(OLDGAS)
oldgas :
	@$(ECHO) $(oldgas)

# Some widespread patched versions of gcc include -fstack-protector by
# default, even when -ffreestanding is specified.  We therefore need
# to disable -fstack-protector if the compiler supports it.
#
ifeq ($(CCTYPE),gcc)
SP_TEST = $(CC) -fno-stack-protector -x c -c /dev/null \
		-o /dev/null >/dev/null 2>&1
SP_FLAGS := $(shell $(SP_TEST) && $(ECHO) '-fno-stack-protector')
CFLAGS	+= $(SP_FLAGS)
endif

# 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 -x c -c /dev/null \
		 -o /dev/null >/dev/null 2>&1
CFI_FLAGS := $(shell $(CFI_TEST) && $(ECHO) '-fno-dwarf2-cfi-asm')
CFLAGS	+= $(CFI_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')
ASFLAGS	+= $(DIVIDE_FLAGS)

###############################################################################
#
# Build verbosity
#
ifeq ($(V),1)
Q :=
QM := @\#
else
Q := @
QM := @
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	:= $(filter bin/% bin-%,$(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]

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

platforms :
	@$(ECHO) $(PLATFORMS)

ifdef BIN

# Determine architecture portion of $(BIN), if present
BIN_ARCH	:= $(strip $(foreach A,$(ARCHS),\
			     $(patsubst bin-$(A)-%,$(A),\
			       $(filter bin-$(A)-%,$(BIN)))))

# Determine platform portion of $(BIN), if present
ifeq ($(BIN_ARCH),)
BIN_PLATFORM	:= $(patsubst bin-%,%,$(filter bin-%,$(BIN)))
else
BIN_PLATFORM	:= $(patsubst bin-$(BIN_ARCH)-%,%,$(BIN))
endif

# 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)
platform :
	@$(ECHO) $(PLATFORM)

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/$(ARCH)/include
INCDIRS		+= arch/$(ARCH)/include/$(PLATFORM)
endif

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

# 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)

# Common flags
#
CFLAGS		+= $(foreach INC,$(INCDIRS),-I$(INC))
CFLAGS		+= -Os
CFLAGS		+= -g
ifeq ($(CCTYPE),gcc)
CFLAGS		+= -ffreestanding
CFLAGS		+= -Wall -W -Wformat-nonliteral
endif
ifeq ($(CCTYPE),icc)
CFLAGS		+= -fno-builtin
CFLAGS		+= -no-ip
CFLAGS		+= -no-gcc
CFLAGS		+= -diag-disable 111 # Unreachable code
CFLAGS		+= -diag-disable 128 # Unreachable loop
CFLAGS		+= -diag-disable 170 # Array boundary checks
CFLAGS		+= -diag-disable 177 # Unused functions
CFLAGS		+= -diag-disable 181 # printf() format checks
CFLAGS		+= -diag-disable 188 # enum strictness
CFLAGS		+= -diag-disable 193 # Undefined preprocessor identifiers
CFLAGS		+= -diag-disable 280 # switch ( constant )
CFLAGS		+= -diag-disable 310 # K&R parameter lists
CFLAGS		+= -diag-disable 424 # Extra semicolon
CFLAGS		+= -diag-disable 589 # Declarations mid-code
CFLAGS		+= -diag-disable 593 # Unused variables
CFLAGS		+= -diag-disable 810 # Casting ints to smaller ints
CFLAGS		+= -diag-disable 981 # Sequence point violations
CFLAGS		+= -diag-disable 1292 # Ignored attributes
CFLAGS		+= -diag-disable 1338 # void pointer arithmetic
CFLAGS		+= -diag-disable 1361 # Variable-length arrays
CFLAGS		+= -diag-disable 1418 # Missing prototypes
CFLAGS		+= -diag-disable 1419 # Missing prototypes
CFLAGS		+= -diag-disable 1599 # Hidden variables
CFLAGS		+= -Wall -Wmissing-declarations
endif
CFLAGS		+= $(EXTRA_CFLAGS)
ASFLAGS		+= $(EXTRA_ASFLAGS)
LDFLAGS		+= $(EXTRA_LDFLAGS)

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

# Function trace recorder state in the last build.  This is needed
# in order to correctly rebuild whenever the function recorder is
# enabled/disabled.
#
FNREC_STATE	:= $(BIN)/.fnrec.state
ifeq ($(wildcard $(FNREC_STATE)),)
FNREC_OLD	:= <invalid>
else
FNREC_OLD	:= $(shell cat $(FNREC_STATE))
endif
ifeq ($(FNREC_OLD),$(FNREC))
$(FNREC_STATE) :
else
$(FNREC_STATE) : clean
$(shell $(ECHO) "$(FNREC)" > $(FNREC_STATE))
endif

VERYCLEANUP	+= $(FNREC_STATE)
MAKEDEPS	+= $(FNREC_STATE)

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

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

# 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)

# ICC requires postprocessing objects to fix up table alignments
#
ifeq ($(CCTYPE),icc)
POST_O		= && $(ICCFIX) $@
POST_O_DEPS	:= $(ICCFIX)
else
POST_O		:=
POST_O_DEPS	:=
endif

# Rules for specific object types.
#
COMPILE_c	= $(CC) $(CFLAGS) $(CFLAGS_c) $(OBJ_CFLAGS)
RULE_c		= $(Q)$(COMPILE_c) -c $< -o $@ $(POST_O)
RULE_c_to_dbg%.o = $(Q)$(COMPILE_c) -Ddebug_$(subst -,_,$(OBJECT))=$* -c $< -o $@ $(POST_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_s	= $(Q)$(PREPROCESS_S) $< > $@

DEBUG_TARGETS	+= dbg%.o c s

# We automatically generate rules for any file mentioned in AUTO_SRCS
# using the following set of templates.  It would be cleaner to use
# $(eval ...), but this function exists only in GNU make >= 3.80.

# 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")
# $(2) is the source type (e.g. "c")
# $(3) is the source base name (e.g. "rtl8139")
#
define deps_template
	@$(ECHO) "  [DEPS] $(1)"
	@$(MKDIR) -p $(BIN)/deps/$(dir $(1))
	@$(CPP) $(CFLAGS) $(CFLAGS_$(2)) $(CFLAGS_$(3)) -DOBJECT=$(3) \
		-Wno-error -M $(1) -MG -MP | \
		sed 's/\.o\s*:/_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")
# $(2) is the source type (e.g. "c")
# $(3) is the source base name (e.g. "rtl8139")
#
define rules_template
	@$(ECHO) "  [RULES] $(1)"
	@$(MKDIR) -p $(BIN)/rules/$(dir $(1))
	@$(ECHO_E) '\n$$(BIN)/$(3).o :' \
		 '$(1) $$(MAKEDEPS) $$(POST_O_DEPS) $$($(3)_DEPS)' \
		 '\n\t$$(QM)$(ECHO) "  [BUILD] $$@"' \
		 '\n\t$$(RULE_$(2))\n' \
		 '\nBOBJS += $$(BIN)/$(3).o\n' \
		 $(foreach TGT,$(DEBUG_TARGETS), \
		    $(if $(RULE_$(2)_to_$(TGT)), \
		    '\n$$(BIN)/$(3).$(TGT) :' \
		    '$(1) $$(MAKEDEPS) $$(POST_O_DEPS) $$($(3)_DEPS)' \
		    '\n\t$$(QM)$(ECHO) "  [BUILD] $$@"' \
		    '\n\t$$(RULE_$(2)_to_$(TGT))\n' \
		    '\n$(TGT)_OBJS += $$(BIN)/$(3).$(TGT)\n' ) ) \
		 '\n$(BIN)/deps/$(1).d : $$($(3)_DEPS)\n' \
		 '\nTAGS : $$($(3)_DEPS)\n' > $(BIN)/rules/$(1).r
	@$(PERL) $(PARSEROM) $(1) >> $(BIN)/rules/$(1).r
endef

# Rule to generate the dependency list file
#
$(BIN)/deps/%.d : % $(MAKEDEPS)
	$(call deps_template,$<,$(subst .,,$(suffix $<)),$(basename $(notdir $<)))

# Calculate and include the list of dependency list files
#
AUTO_DEPS	= $(patsubst %,$(BIN)/deps/%.d,$(AUTO_SRCS))
ifdef NEED_DEPS
ifneq ($(AUTO_DEPS),)
-include $(AUTO_DEPS)
endif
endif
autodeps :
	@$(ECHO) $(AUTO_DEPS)
VERYCLEANUP	+= $(BIN)/deps

# Rule to generate the rules file
#
$(BIN)/rules/%.r : % $(MAKEDEPS) $(PARSEROM)
	$(call rules_template,$<,$(subst .,,$(suffix $<)),$(basename $(notdir $<)))

# Calculate and include the list of rules files
#
AUTO_RULES	= $(patsubst %,$(BIN)/rules/%.r,$(AUTO_SRCS))
ifdef NEED_DEPS
ifneq ($(AUTO_RULES),)
-include $(AUTO_RULES)
endif
endif
autorules :
	@$(ECHO) $(AUTO_RULES)
VERYCLEANUP	+= $(BIN)/rules

# The following variables are created by the rules files
#
bobjs :
	@$(ECHO) $(BOBJS)
drivers :
	@$(ECHO) $(DRIVERS)
.PHONY : drivers
roms :
	@$(ECHO) $(ROMS)

# 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.
#
EMBEDDED_LIST	:= $(BIN)/.embedded.list
ifeq ($(wildcard $(EMBEDDED_LIST)),)
EMBEDDED_IMAGE_OLD := <invalid>
else
EMBEDDED_IMAGE_OLD := $(shell cat $(EMBEDDED_LIST))
endif
ifneq ($(EMBEDDED_IMAGE_OLD),$(EMBEDDED_IMAGE))
$(shell $(ECHO) "$(EMBEDDED_IMAGE)" > $(EMBEDDED_LIST))
endif

$(EMBEDDED_LIST) :

VERYCLEANUP	+= $(EMBEDDED_LIST)

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

$(BIN)/embedded.o : $(EMBEDDED_FILES) $(EMBEDDED_LIST)

# This file uses .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.o : override CC := env CCACHE_DISABLE=1 $(CC)

CFLAGS_embedded = -DEMBED_ALL="$(EMBED_ALL)"

# 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 > $@

# 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.zrom.tmp") and
# derive the variables:
# 
# TGT_ELEMENTS : the elements of the target (e.g. "dfe538 prism2_pci")
# TGT_PREFIX   : the prefix type (e.g. "zrom")
# TGT_DRIVERS  : the driver for each element (e.g. "rtl8139 prism2_pci")
# TGT_ROM_NAME : the ROM name (e.g. "dfe538")
# TGT_MEDIA    : the media type (e.g. "rom")
#
DRIVERS_ipxe	= $(DRIVERS)
CARD_DRIVER	= $(firstword $(DRIVER_$(1)) $(1))
TGT_ELEMENTS	= $(subst --, ,$(firstword $(subst ., ,$(notdir $@))))
TGT_PREFIX	= $(word 2,$(subst ., ,$(notdir $@)))
TGT_ROM_NAME	= $(firstword $(TGT_ELEMENTS))
TGT_DRIVERS	= $(strip $(if $(DRIVERS_$(TGT_ROM_NAME)), \
			       $(DRIVERS_$(TGT_ROM_NAME)), \
			       $(foreach TGT_ELEMENT,$(TGT_ELEMENTS), \
			         $(call CARD_DRIVER,$(TGT_ELEMENT))) ))
TGT_MEDIA	= $(subst z,,$(TGT_PREFIX))

# Look up ROM IDs for the current target
# (e.g. "bin/dfe538--prism2_pci.zrom.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.zrom.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_%,$(TGT_DRIVERS)))
TGT_LD_PREFIX	= obj_$(TGT_PREFIX)prefix
TGT_LD_IDS	= pci_vendor_id=$(firstword $(TGT_PCI_VENDOR) 0) \
		  pci_device_id=$(firstword $(TGT_PCI_DEVICE) 0)

# Calculate linker flags based on link-time options for the current
# target type (e.g. "bin/dfe538--prism2_pci.zrom.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_PREFIX) $(TGT_LD_DRIVERS) obj_config,\
		    -u $(SYM) --defsym check_$(SYM)=$(SYM) ) \
		  $(patsubst %,--defsym %,$(TGT_LD_IDS)) \
		  $(TGT_LD_FLAGS_PRE)

# Calculate list of debugging versions of objects to be included in
# the target.
#
DEBUG_LIST	= $(subst $(COMMA), ,$(DEBUG))
DEBUG_OBJ_LEVEL	= $(firstword $(word 2,$(subst :, ,$(1))) 1)
DEBUG_OBJ_BASE	= $(word 1,$(subst :, ,$(1))).dbg$(call DEBUG_OBJ_LEVEL,$(1))
DEBUG_OBJ	= $(BIN)/$(call DEBUG_OBJ_BASE,$(1)).o
DEBUG_ORIG_OBJ	= $(BIN)/$(word 1,$(subst :, ,$(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) 'Media                : $(TGT_MEDIA)'
	@$(ECHO)
	@$(ECHO) 'PCI vendor           : $(TGT_PCI_VENDOR)'
	@$(ECHO) 'PCI device           : $(TGT_PCI_DEVICE)'
	@$(ECHO)
	@$(ECHO) 'LD driver symbols    : $(TGT_LD_DRIVERS)'
	@$(ECHO) 'LD prefix symbols    : $(TGT_LD_PREFIX)'
	@$(ECHO) 'LD ID symbols        : $(TGT_LD_IDS)'
	@$(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) :

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) r $@ $(BLIB_OBJS)
	$(Q)$(RANLIB) $@
blib : $(BLIB)

# Command to generate build ID.  Must be unique for each $(BIN)/%.tmp,
# even within the same build run.
#
BUILD_ID_CMD	:= perl -e 'printf "0x%08x", int ( rand ( 0xffffffff ) );'

# Build an intermediate object file from the objects required for the
# specified target.
#
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
	$(QM)$(ECHO) "  [LD] $@"
	$(Q)$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $(BLIB) -o $@ \
		--defsym _build_id=`$(BUILD_ID_CMD)` -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 unlicensed_deps_list
	$(shell grep -L FILE_LICENCE $(call deps_list,$(1)))
endef
define licence_list
	$(patsubst __licence_%,%,\
	  $(filter __licence_%,$(shell $(NM) $(1) | cut -d" " -f3)))
endef
$(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.

media :
	@$(ECHO) $(MEDIA)

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

# media_template : create Makefile rules for specified media
#
# $(1) is the media name (e.g. "rom")
#
define media_template
	@$(ECHO) "  [MEDIARULES] $(1)"
	@$(MKDIR) -p $(BIN)/rules/$(dir $(1))
	@$(ECHO_E) '$$(BIN)/%.$(1) : $$(BIN)/%.$(1).zbin' \
		  '\n\t$$(QM)$(ECHO) "  [FINISH] $$@"' \
		  '\n\t$$(Q)$$(CP) $$< $$@' \
		  '\n\t$$(Q)$$(PAD_$(1))' \
		  '\n\t$$(Q)$$(FINALISE_$(1))' \
		> $(BIN)/rules/$(1).media.r
endef

# Rule to generate the Makefile rules to be included
#
$(BIN)/rules/%.media.r : $(MAKEDEPS)
	$(call media_template,$*)

# Calculate and include the list of Makefile rules files
#
MEDIA_RULES		= $(patsubst %,$(BIN)/rules/%.media.r,$(AUTO_MEDIA))
mediarules :
	@$(ECHO) $(MEDIA_RULES)
ifdef NEED_DEPS
ifneq ($(MEDIA_RULES),)
-include $(MEDIA_RULES)
endif
endif

# Wrap up binary blobs (for embedded images)
#
$(BIN)/%.o : payload/%.img
	$(QM)echo "  [WRAP] $@"
	$(Q)$(LD) -b binary -r -o $@ $< --undefined obj_payload \
		--defsym obj_$*=0

BOBJS += $(patsubst payload/%.img,$(BIN)/%.o,$(wildcard payload/*.img))

# The "allXXXs" targets for each suffix
#
allall: allroms allzroms allpxes allisos alldsks
allroms allzroms : all%s : $(foreach ROM,$(ROMS),$(BIN)/$(ROM).%)
allpxes allisos alldsks : all%s : $(foreach DRIVER,$(DRIVERS),$(BIN)/$(DRIVER).%)

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

endif # defined(BIN)

###############################################################################
#
# The compression utilities
#
$(NRV2B) : util/nrv2b.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) -O2 -DENCODE -DDECODE -DMAIN -DVERBOSE -DNDEBUG \
		       -DBITSIZE=32 -DENDIAN=0 -o $@ $<
CLEANUP	+= $(NRV2B)

$(ZBIN) : util/zbin.c util/nrv2b.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) -O2 -o $@ $<
CLEANUP += $(ZBIN)

###############################################################################
#
# The EFI image converter
#
ELF2EFI_CFLAGS	:= -I$(BINUTILS_DIR)/include -I$(BFD_DIR)/include \
		   -I$(ZLIB_DIR)/include -idirafter include \
		   -L$(BINUTILS_DIR)/lib -L$(BFD_DIR)/lib -L$(ZLIB_DIR)/lib \
		   -lbfd -liberty -lz -Wl,--no-warn-search-mismatch

$(ELF2EFI32) : util/elf2efi.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $< $(ELF2EFI_CFLAGS) -DEFI_TARGET_IA32 -O2 -o $@
CLEANUP += $(ELF2EFI32)

$(ELF2EFI64) : util/elf2efi.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) $< $(ELF2EFI_CFLAGS) -DEFI_TARGET_X64 -O2 -o $@
CLEANUP += $(ELF2EFI64)

$(EFIROM) : util/efirom.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
CLEANUP += $(EFIROM)

###############################################################################
#
# The ICC fixup utility
#
$(ICCFIX) : util/iccfix.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
CLEANUP += $(ICCFIX)

###############################################################################
#
# The error usage information utility
#
$(EINFO) : util/einfo.c $(MAKEDEPS)
	$(QM)$(ECHO) "  [HOSTCC] $@"
	$(Q)$(HOST_CC) -idirafter include -O2 -o $@ $<
CLEANUP += $(EINFO)

###############################################################################
#
# Local configs
#
config/local/%.h :
	$(Q)touch $@

###############################################################################
#
# Auto-incrementing build serial number.  Append "bs" to your list of
# build targets to get a serial number printed at the end of the
# build.  Enable -DBUILD_SERIAL in order to see it when the code runs.
#
BUILDSERIAL_H		= config/.buildserial.h
BUILDSERIAL_NOW		= config/.buildserial.now
BUILDSERIAL_NEXT	= config/.buildserial.next

$(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT) :
	$(ECHO) 1 > $@

$(BUILDSERIAL_H) : $(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT)
	$(ECHO) '#define BUILD_SERIAL_NUM $(shell cat $<)' > $@

ifeq ($(filter bs,$(MAKECMDGOALS)),bs)
$(shell diff -q $(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT) > /dev/null || \
	cp -f $(BUILDSERIAL_NEXT) $(BUILDSERIAL_NOW))
endif

bs : $(BUILDSERIAL_NOW)
	@$(ECHO) $$(( $(shell cat $<) + 1 )) > $(BUILDSERIAL_NEXT)
	@$(ECHO) "Build serial number is $(shell cat $<)"

###############################################################################
#
# 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)

###############################################################################
#
# Clean-up
#
clean :
	$(RM) $(CLEANUP)

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