Makefile.main - skiboot - Git at Google

 # SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 #
 # This is the main Makefile
 #
 # Copyright 2013-2019 IBM Corp

 # Target tools
 CC=$(CROSS)gcc$(POSTFIX)
 LD=$(CROSS)ld$(POSTFIX)
 AS=$(CROSS)as
 AR=$(CROSS)ar
 NM=$(CROSS)nm
 OBJCOPY=$(CROSS)objcopy
 OBJDUMP=$(CROSS)objdump
 SIZE=$(CROSS)size
 LD_TEXT=0x0
 NM += --synthetic

 try = $(shell set -e; if ($(1)) >/dev/null 2>&1; \
 	then echo "$(2)"; \
 	else echo "$(3)"; fi )

 try-cflag = $(call try,$(1) -Werror $(2) -x c -c /dev/null -o /dev/null,$(2))
 try-ldflag = $(call try,$(1) $(2) -v,$(2))
 test_cflag = $(call try,$(1) -Werror $(2) -x c -c /dev/null -o /dev/null,1,0)

 cc-name := $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)

 # Base warnings
 CWARNS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 	  -Werror-implicit-function-declaration -Wdeclaration-after-statement \
 	  -Wno-pointer-sign -Wextra -Wno-sign-compare \
 	  -Wmissing-prototypes -Wmissing-declarations \
 	  -Wwrite-strings -Wcast-align \
 	  -Winit-self

 # Do not convert warnings to error on tagged/released version
 GIT_DIR ?= $(shell test -e $(SRC)/.git && echo 1 || echo 0)
 ifeq ($(GIT_DIR),1)	# Building from git tree
 GIT_SHA ?= $(shell cd $(SRC); git describe --tags 2>/dev/null)
 GIT_TAG ?= $(shell cd $(SRC); git tag -l 2>/dev/null | grep -x ${GIT_SHA} >/dev/null 2>&1 && echo 1 || echo 0)
 ifneq ($(GIT_TAG),1)	# Development branch
 CWARNS += -Werror
 endif
 endif

 # clang tends to emit more warnings so stop those breaking the build for now
 ifeq ($(cc-name),clang)
 CWARNS += -Wno-error
 endif

 # Host tools and options
 HOSTCC=gcc
 HOSTEND=$(shell uname -m | sed -e 's/^i.*86$$/LITTLE/' -e 's/^x86.*/LITTLE/' -e 's/^ppc64le/LITTLE/' -e 's/^ppc.*/BIG/' -e 's/^riscv.*/LITTLE/')
 HOSTCFLAGS:=-O1 $(CWARNS) -DHAVE_$(HOSTEND)_ENDIAN -MMD
 HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-std=gnu11)
 HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-m64)
 HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-Wjump-misses-init) \
 	  $(call try-cflag,$(HOSTCC),-Wsuggest-attribute=const) \
 	  $(call try-cflag,$(HOSTCC),-Wsuggest-attribute=noreturn) \
 	  $(call try-cflag,$(HOSTCC),-Wno-error=suggest-attribute=const) \
 	  $(call try-cflag,$(HOSTCC),-Wno-error=suggest-attribute=noreturn)
 HOSTCFLAGS += -DDEBUG -DCCAN_LIST_DEBUG

 # We want small stack usage for skiboot
 CWARNS += -Wframe-larger-than=1024

 HOSTGCOVCFLAGS = -fprofile-arcs -ftest-coverage -lgcov -O0 -g -pg

 VALGRIND := valgrind -q --show-reachable=yes --error-exitcode=99

 # Target options

 OPTS=-Os
 DBG=-g

 CPPFLAGS := -I$(SRC)/include -Iinclude -MMD -include $(SRC)/include/config.h
 CPPFLAGS += -I$(SRC)/libfdt -I$(SRC)/libflash -I$(SRC)/libxz -I$(SRC)/libc/include -I$(SRC)
 CPPFLAGS += -I$(SRC)/libpore -I$(SRC)/libmctp
 CPPFLAGS += -D__SKIBOOT__ -nostdinc
 CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 CPPFLAGS += -DBITS_PER_LONG=64

 # We might want to remove our copy of stdint.h
 # but that means uint64_t becomes an ulong instead of an ullong
 # causing all our printf's to warn
 CPPFLAGS += -ffreestanding

 ifeq ($(LITTLE_ENDIAN),1)
 CPPFLAGS += -DHAVE_LITTLE_ENDIAN
 CPPFLAGS += -D__LITTLE_ENDIAN_BITFIELD
 else
 CPPFLAGS += -DHAVE_BIG_ENDIAN
 CPPFLAGS += -D__BIG_ENDIAN_BITFIELD
 endif

 ifeq ($(DEBUG),1)
 CPPFLAGS += -DDEBUG -DCCAN_LIST_DEBUG
 endif

 CFLAGS := -fno-strict-aliasing -pie -fpie -fno-pic -m64 -fno-asynchronous-unwind-tables
 ifeq ($(CONFIG_P8),1)
 CFLAGS += -mcpu=power8
 else
 CFLAGS += -mcpu=power9
 endif
 CFLAGS += -Wl,--oformat,elf64-powerpc -ggdb
 # r13,r14,r15 are preserved for OS to use as fixed registers.
 # These could be saved and restored in and out of skiboot, but it's more
 # robust to avoid touching them.
 CFLAGS += -ffixed-r13
 CFLAGS += -ffixed-r14
 CFLAGS += -ffixed-r15
 # r16 is skiboot's per-CPU data pointer.
 CFLAGS += -ffixed-r16
 CFLAGS += $(call try-cflag,$(CC),-std=gnu11)

 ifeq ($(LITTLE_ENDIAN),1)
 CFLAGS += -mlittle-endian
 else
 CFLAGS += -mbig-endian
 endif

 ifeq ($(ELF_ABI_v2),1)
 CFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
 else
 CFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
 endif

 ifeq ($(DEAD_CODE_ELIMINATION),1)
 CFLAGS += -ffunction-sections -fdata-sections
 endif

 ifeq ($(SKIBOOT_GCOV),1)
 CFLAGS += -fprofile-arcs -ftest-coverage -DSKIBOOT_GCOV=1
 endif

 ifeq ($(USE_VALGRIND),1)
 CFLAGS += -DUSE_VALGRIND=1
 else
 VALGRIND :=
 endif

 # Check if the new parametrized stack protector option is supported
 # by gcc, otherwise disable stack protector
 STACK_PROT_CFLAGS := -mstack-protector-guard=tls -mstack-protector-guard-reg=r16
 STACK_PROT_CFLAGS += -mstack-protector-guard-offset=0
 HAS_STACK_PROT := $(call test_cflag,$(CC),$(STACK_PROT_CFLAGS))

 ifeq ($(STACK_CHECK),1)
 STACK_PROT_CFLAGS += -fstack-protector-all
 CPPFLAGS += -DSTACK_CHECK_ENABLED
 CFLAGS += -pg
 else
 STACK_PROT_CFLAGS += -fstack-protector
 STACK_PROT_CFLAGS += $(call try-cflag,$(CC),-fstack-protector-strong)
 endif

 ifeq ($(HAS_STACK_PROT),1)
 CPPFLAGS += -DHAS_STACK_PROT
 CFLAGS += $(STACK_PROT_CFLAGS)
 else
 CFLAGS += -fno-stack-protector
 endif

 # Add preprocessor defines for CONFIG_ options here
 ifeq ($(CONFIG_P8),1)
 CFLAGS += -DCONFIG_P8=1
 endif
 ifeq ($(CONFIG_PLDM),1)
 CFLAGS += -DCONFIG_PLDM=1
 endif

 CFLAGS += $(call try-cflag,$(CC),-Wjump-misses-init) \
 	  $(call try-cflag,$(CC),-Wsuggest-attribute=const) \
 	  $(call try-cflag,$(CC),-Wsuggest-attribute=noreturn) \
 	  $(call try-cflag,$(CC),-Wno-error=suggest-attribute=const) \
 	  $(call try-cflag,$(CC),-Wno-error=suggest-attribute=noreturn) \
 	  $(call try-cflag,$(CC),-Wstack-usage=1024) \
 	  $(call try-cflag,$(CC),-Wno-error=array-bounds) \
 	  $(call try-cflag,$(CC),-Wno-error=stringop-overread) \
 	  $(call try-cflag,$(CC),-Wno-error=address-of-packed-member)

 CFLAGS += $(CWARNS) $(OPTS) $(DBG)

 LDFLAGS := -m64 -static -nostdlib -pie
 LDFLAGS += -Wl,-pie
 LDFLAGS += -Wl,-Ttext-segment,$(LD_TEXT) -Wl,-N -Wl,--build-id=none
 LDFLAGS += -Wl,--no-multi-toc
 ifeq ($(CONFIG_P8),1)
 LDFLAGS += -mcpu=power8
 else
 LDFLAGS += -mcpu=power9
 endif
 LDFLAGS += -Wl,--oformat,elf64-powerpc
 LDFLAGS_FINAL = -m elf64lppc --no-multi-toc -N --build-id=none --whole-archive
 LDFLAGS_FINAL += -static -nostdlib -pie -Ttext-segment=$(LD_TEXT) --oformat=elf64-powerpc
 LDFLAGS_FINAL += --orphan-handling=warn
 LDFLAGS_FINAL += $(call try-ldflag,$(LD),--no-warn-rwx-segments)

 LDRFLAGS=-melf64ppc
 # Debug stuff
 #LDFLAGS += -Wl,-v -Wl,-Map,foomap

 ifeq ($(LITTLE_ENDIAN),1)
 LDFLAGS += -mlittle-endian
 LDFLAGS_FINAL += -EL
 else
 LDFLAGS += -mbig-endian
 LDFLAGS_FINAL += -EB
 endif

 ifeq ($(DEAD_CODE_ELIMINATION),1)
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS_FINAL += --gc-sections
 endif

 AFLAGS := -D__ASSEMBLY__ -m64
 ifeq ($(LITTLE_ENDIAN),1)
 AFLAGS += -mlittle-endian
 else
 AFLAGS += -mbig-endian
 endif

 ifeq ($(ELF_ABI_v2),1)
 AFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
 else
 AFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
 endif

 ifeq ($(cc-name),clang)
 CLANG_TARGET    := --target=powerpc64-linux-gnu -mcpu=pwr8
 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 ifneq ($(GCC_TOOLCHAIN),)
 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
 CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 LDFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)

 # Workarounds
 # TODO: Fix the issues these hide, and remove them
 CFLAGS += -Wno-cast-align \
 	-Wno-unused-command-line-argument \
 	-Wno-unknown-warning-option \
 	-Wno-gnu-variable-sized-type-not-at-end \
 	-Wno-address-of-packed-member \
 	-Wno-error=ignored-attributes

 # pci_add_device_nodes is the largest, at 2048 with clang-7 (smaller with older
 # versions)
 CFLAGS += -Wframe-larger-than=2048
 endif

 # Special tool flags:
 # Do not use the floating point unit
 CFLAGS += -msoft-float
 # Do not use string instructions
 CFLAGS += $(call try-cflag,$(CC),-mno-string)
 # do not use load/store multiple word instrcutions
 CFLAGS += $(call try-cflag,$(CC),-mno-multiple)
 # Do not use any automatic vector foo. While it would be safe during boot, we
 # don't save/restore across OPAL calls
 CFLAGS += -mno-vsx -mno-altivec

 # Do not use load/store update. You REALLY do not want to use this!
 # The async safety of the ABI stack depends on the atomicity
 # of update on store.
 #CFLAGS += -mno-update

 ifneq ($(KERNEL),)
 CPPFLAGS += -DBUILTIN_KERNEL="\"$(KERNEL)\""
 endif

 CHECK		= sparse
 CHECKFLAGS     := $(CF)
 CHECK_CFLAGS_SKIP = -std=gnu11

 .SECONDARY:

 vpath %.c $(SRC)
 vpath %.C $(SRC)
 vpath %.S $(SRC)

 default: all

 include/asm-offsets.h: asm/asm-offsets.s
 	@mkdir -p include
 	$(call Q,GN, $(SRC)/make_offsets.sh $< >$@, $@)

 TARGET = skiboot

 include $(SRC)/asm/Makefile.inc
 include $(SRC)/core/Makefile.inc
 include $(SRC)/hw/Makefile.inc
 include $(SRC)/platforms/Makefile.inc
 include $(SRC)/libfdt/Makefile.inc
 include $(SRC)/libflash/Makefile.inc
 include $(SRC)/libxz/Makefile.inc
 include $(SRC)/libpore/Makefile.inc
 include $(SRC)/libc/Makefile.inc
 include $(SRC)/ccan/Makefile.inc
 include $(SRC)/$(DEVSRC)/Makefile.inc
 include $(SRC)/libstb/Makefile.inc
 ifeq ($(CONFIG_PLDM),1)
 include $(SRC)/libmctp/Makefile.inc
 include $(SRC)/pldm/libpldm/Makefile.inc
 include $(SRC)/pldm/libpldm/oem/ibm/Makefile.inc
 endif

 # hack for travis-ci and coverity
 gard:
 	(cd external/gard; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make)

 coverage: gard-coverage
 gard-coverage:
 	(cd external/gard; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make coverage)

 pflash:
 	(cd external/pflash; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make)

 coverage: pflash-coverage
 pflash-coverage:
 	(cd external/pflash; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make coverage)

 pflash-coverity:
 	(cd external/pflash; ./build-all-arch.sh)

 all: $(SUBDIRS) $(TARGET).lid $(TARGET).lid.xz $(TARGET).map extract-gcov
 all: $(TARGET).lid.stb $(TARGET).lid.xz.stb

 OBJS := $(ASM) $(CORE) $(HW) $(PLATFORMS) $(LIBFDT) $(LIBXZ) $(LIBFLASH) $(LIBSTB)
 OBJS += $(LIBC) $(CCAN) $(DEVSRC_OBJ) $(LIBPORE)
 ifeq ($(CONFIG_PLDM),1)
 OBJS += $(LIBMCTP) $(LIBPLDM) $(LIBPLDM_IBM)
 endif
 OBJS_NO_VER = $(OBJS)
 ALL_OBJS = $(OBJS) version.o

 ALL_OBJS_1 = $(TARGET).tmp.a asm/dummy_map.o
 ALL_OBJS_2 = $(TARGET).tmp.a asm/real_map.o

 %.lid.xz: %.lid
 	$(call Q,XZ, cat $^ | xz -9 -C crc32 > $@, $@)

 %.lid: %.elf
 	$(call Q,OBJCOPY, $(OBJCOPY) -O binary -S $^ $@, $@)

 $(TARGET).lid.stb: $(TARGET).lid libstb/create-container
 	$(call Q,STB-DEVELOPMENT-SIGNED-CONTAINER,$(SRC)/libstb/sign-with-local-keys.sh $< $@ $(SRC)/libstb/keys/ PAYLOAD,$@)

 $(TARGET).lid.xz.stb: $(TARGET).lid.xz libstb/create-container
 	$(call Q,STB-DEVELOPMENT-SIGNED-CONTAINER,$(SRC)/libstb/sign-with-local-keys.sh $< $@ $(SRC)/libstb/keys/ PAYLOAD,$@)

 $(TARGET).tmp.a: $(ALL_OBJS)
 	@rm -f $(TARGET).tmp.a
 	$(call Q,AR, $(AR) rcsTPD $@ $(ALL_OBJS), $@)

 $(TARGET).tmp.elf: $(ALL_OBJS_1) $(TARGET).lds $(KERNEL)
 	$(call Q,LD, $(LD) $(LDFLAGS_FINAL) -o $@ -T $(TARGET).lds $(ALL_OBJS_1), $@)

 asm/real_map.o : $(TARGET).tmp.map

 $(TARGET).elf: $(ALL_OBJS_2) $(TARGET).lds $(KERNEL)
 	$(call Q,LD, $(LD) $(LDFLAGS_FINAL) -o $@ -T $(TARGET).lds $(ALL_OBJS_2), $@)

 $(SUBDIRS):
 	$(call Q,MKDIR,mkdir -p $@, $@)

 -include $(wildcard *.d)
 -include $(wildcard $(SUBDIRS:%=%/*.d))

 # Set V=1 if you want to see everything.
 include $(SRC)/Makefile.rules

 VERSION ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git $(SRC)/make_version.sh)

 .PHONY: VERSION-always
 .version: VERSION-always
 	@echo $(VERSION) > $@.tmp
 	@cmp -s $@ $@.tmp || cp $@.tmp $@
 	@rm -f $@.tmp

 version.c: $(SRC)/make_version.sh $(OBJS_NO_VER) .version
 	@(if [ "a$(VERSION)" = "a" ]; then \
 		echo "#error You need to set SKIBOOT_VERSION environment variable" > $@ ;\
         else \
 		echo "extern const char version[];"; \
                 echo "const char version[] = \"$(VERSION)\";" ;\
         fi) > $@

 .PHONY: coverage
 include $(shell find $(SRC)/* -name Makefile.check)

 extract-gcov: extract-gcov.c
 	$(call Q, HOSTCC ,$(HOSTCC) $(HOSTCFLAGS) \
 	-DTARGET__GNUC__=`echo '__GNUC__'|$(CC) -E -|grep -v '^#'` \
 	-DTARGET__GNUC_MINOR__=`echo '__GNUC_MINOR__'|$(CC) -E -|grep -v '^#'` \
 	-Wpadded -O0 -g -I$(SRC) -o $@ $<,$<)

 coverage-report: skiboot.info
 	genhtml --branch-coverage -q -o $@ $<

 # A rather nasty hack here that relies on the lcov file format
 external/pflash/pflash.info: coverage
 	(cd external/pflash; lcov -q -c -d . -o pflash.info --rc lcov_branch_coverage=1; sed -i -e 's%external/pflash/libflash%libflash%; s%external/pflash/ccan%ccan%' pflash.info)
 external/gard/gard.info: coverage
 	(cd external/gard; lcov -q -c -d . -o gard.info --rc lcov_branch_coverage=1; sed -i -e 's%external/gard/libflash%libflash%; s%external/gard/ccan%ccan%' gard.info)

 skiboot.info: coverage external/pflash/pflash.info external/gard/gard.info
 	lcov -q -c -d . $(LCOV_DIRS) -o $@ --rc lcov_branch_coverage=1
 	lcov -q -r $@ 'external/pflash/*' -o $@
 	lcov -q -r $@ 'external/gard/*' -o $@
 	lcov -q -a $@ -a external/pflash/pflash.info -o $@
 	lcov -q -a $@ -a external/gard/gard.info -o $@
 	lcov -q -r $@ $(LCOV_EXCLUDE) -o $@ --rc lcov_branch_coverage=1

 doc:
 	make -C doc html

 tags:
 	find . -name '*.[chS]' | xargs ctags

 TAGS:
 	find . -name '*.[chS]' | xargs etags

 .PHONY: tags TAGS check coverage doc

 cscope:
 	find . -name '*.[chS]' | xargs cscope

 clean:
 	$(RM) *.[odsa] $(SUBDIRS:%=%/*.[odsa])
 	$(RM) *.gcno $(SUBDIRS:%=%/*.gcno)
 	$(RM) *.gcda $(SUBDIRS:%=%/*.gcda)
 	$(RM) *.elf $(TARGET).lid *.map $(TARGET).lds $(TARGET).lid.xz
 	$(RM) include/asm-offsets.h version.c .version
 	$(RM) skiboot.info external/gard/gard.info external/pflash/pflash.info
 	$(RM) extract-gcov $(TARGET).lid.stb $(TARGET).lid.xz.stb

 distclean: clean
 	$(RM) *~ $(SUBDIRS:%=%/*~) include/*~
	# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
	#
	# This is the main Makefile
	#
	# Copyright 2013-2019 IBM Corp

	# Target tools
	CC=$(CROSS)gcc$(POSTFIX)
	LD=$(CROSS)ld$(POSTFIX)
	AS=$(CROSS)as
	AR=$(CROSS)ar
	NM=$(CROSS)nm
	OBJCOPY=$(CROSS)objcopy
	OBJDUMP=$(CROSS)objdump
	SIZE=$(CROSS)size
	LD_TEXT=0x0
	NM += --synthetic

	try = $(shell set -e; if ($(1)) >/dev/null 2>&1; \
	then echo "$(2)"; \
	else echo "$(3)"; fi )

	try-cflag = $(call try,$(1) -Werror $(2) -x c -c /dev/null -o /dev/null,$(2))
	try-ldflag = $(call try,$(1) $(2) -v,$(2))
	test_cflag = $(call try,$(1) -Werror $(2) -x c -c /dev/null -o /dev/null,1,0)

	cc-name := $(shell $(CC) -v 2>&1 \| grep -q "clang version" && echo clang \|\| echo gcc)

	# Base warnings
	CWARNS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
	-Werror-implicit-function-declaration -Wdeclaration-after-statement \
	-Wno-pointer-sign -Wextra -Wno-sign-compare \
	-Wmissing-prototypes -Wmissing-declarations \
	-Wwrite-strings -Wcast-align \
	-Winit-self

	# Do not convert warnings to error on tagged/released version
	GIT_DIR ?= $(shell test -e $(SRC)/.git && echo 1 \|\| echo 0)
	ifeq ($(GIT_DIR),1) # Building from git tree
	GIT_SHA ?= $(shell cd $(SRC); git describe --tags 2>/dev/null)
	GIT_TAG ?= $(shell cd $(SRC); git tag -l 2>/dev/null \| grep -x ${GIT_SHA} >/dev/null 2>&1 && echo 1 \|\| echo 0)
	ifneq ($(GIT_TAG),1) # Development branch
	CWARNS += -Werror
	endif
	endif

	# clang tends to emit more warnings so stop those breaking the build for now
	ifeq ($(cc-name),clang)
	CWARNS += -Wno-error
	endif

	# Host tools and options
	HOSTCC=gcc
	HOSTEND=$(shell uname -m \| sed -e 's/^i.86$$/LITTLE/' -e 's/^x86./LITTLE/' -e 's/^ppc64le/LITTLE/' -e 's/^ppc./BIG/' -e 's/^riscv./LITTLE/')
	HOSTCFLAGS:=-O1 $(CWARNS) -DHAVE_$(HOSTEND)_ENDIAN -MMD
	HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-std=gnu11)
	HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-m64)
	HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-Wjump-misses-init) \
	$(call try-cflag,$(HOSTCC),-Wsuggest-attribute=const) \
	$(call try-cflag,$(HOSTCC),-Wsuggest-attribute=noreturn) \
	$(call try-cflag,$(HOSTCC),-Wno-error=suggest-attribute=const) \
	$(call try-cflag,$(HOSTCC),-Wno-error=suggest-attribute=noreturn)
	HOSTCFLAGS += -DDEBUG -DCCAN_LIST_DEBUG

	# We want small stack usage for skiboot
	CWARNS += -Wframe-larger-than=1024

	HOSTGCOVCFLAGS = -fprofile-arcs -ftest-coverage -lgcov -O0 -g -pg

	VALGRIND := valgrind -q --show-reachable=yes --error-exitcode=99

	# Target options

	OPTS=-Os
	DBG=-g

	CPPFLAGS := -I$(SRC)/include -Iinclude -MMD -include $(SRC)/include/config.h
	CPPFLAGS += -I$(SRC)/libfdt -I$(SRC)/libflash -I$(SRC)/libxz -I$(SRC)/libc/include -I$(SRC)
	CPPFLAGS += -I$(SRC)/libpore -I$(SRC)/libmctp
	CPPFLAGS += -D__SKIBOOT__ -nostdinc
	CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include)
	CPPFLAGS += -DBITS_PER_LONG=64

	# We might want to remove our copy of stdint.h
	# but that means uint64_t becomes an ulong instead of an ullong
	# causing all our printf's to warn
	CPPFLAGS += -ffreestanding

	ifeq ($(LITTLE_ENDIAN),1)
	CPPFLAGS += -DHAVE_LITTLE_ENDIAN
	CPPFLAGS += -D__LITTLE_ENDIAN_BITFIELD
	else
	CPPFLAGS += -DHAVE_BIG_ENDIAN
	CPPFLAGS += -D__BIG_ENDIAN_BITFIELD
	endif

	ifeq ($(DEBUG),1)
	CPPFLAGS += -DDEBUG -DCCAN_LIST_DEBUG
	endif

	CFLAGS := -fno-strict-aliasing -pie -fpie -fno-pic -m64 -fno-asynchronous-unwind-tables
	ifeq ($(CONFIG_P8),1)
	CFLAGS += -mcpu=power8
	else
	CFLAGS += -mcpu=power9
	endif
	CFLAGS += -Wl,--oformat,elf64-powerpc -ggdb
	# r13,r14,r15 are preserved for OS to use as fixed registers.
	# These could be saved and restored in and out of skiboot, but it's more
	# robust to avoid touching them.
	CFLAGS += -ffixed-r13
	CFLAGS += -ffixed-r14
	CFLAGS += -ffixed-r15
	# r16 is skiboot's per-CPU data pointer.
	CFLAGS += -ffixed-r16
	CFLAGS += $(call try-cflag,$(CC),-std=gnu11)

	ifeq ($(LITTLE_ENDIAN),1)
	CFLAGS += -mlittle-endian
	else
	CFLAGS += -mbig-endian
	endif

	ifeq ($(ELF_ABI_v2),1)
	CFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
	else
	CFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
	endif

	ifeq ($(DEAD_CODE_ELIMINATION),1)
	CFLAGS += -ffunction-sections -fdata-sections
	endif

	ifeq ($(SKIBOOT_GCOV),1)
	CFLAGS += -fprofile-arcs -ftest-coverage -DSKIBOOT_GCOV=1
	endif

	ifeq ($(USE_VALGRIND),1)
	CFLAGS += -DUSE_VALGRIND=1
	else
	VALGRIND :=
	endif

	# Check if the new parametrized stack protector option is supported
	# by gcc, otherwise disable stack protector
	STACK_PROT_CFLAGS := -mstack-protector-guard=tls -mstack-protector-guard-reg=r16
	STACK_PROT_CFLAGS += -mstack-protector-guard-offset=0
	HAS_STACK_PROT := $(call test_cflag,$(CC),$(STACK_PROT_CFLAGS))

	ifeq ($(STACK_CHECK),1)
	STACK_PROT_CFLAGS += -fstack-protector-all
	CPPFLAGS += -DSTACK_CHECK_ENABLED
	CFLAGS += -pg
	else
	STACK_PROT_CFLAGS += -fstack-protector
	STACK_PROT_CFLAGS += $(call try-cflag,$(CC),-fstack-protector-strong)
	endif

	ifeq ($(HAS_STACK_PROT),1)
	CPPFLAGS += -DHAS_STACK_PROT
	CFLAGS += $(STACK_PROT_CFLAGS)
	else
	CFLAGS += -fno-stack-protector
	endif

	# Add preprocessor defines for CONFIG_ options here
	ifeq ($(CONFIG_P8),1)
	CFLAGS += -DCONFIG_P8=1
	endif
	ifeq ($(CONFIG_PLDM),1)
	CFLAGS += -DCONFIG_PLDM=1
	endif

	CFLAGS += $(call try-cflag,$(CC),-Wjump-misses-init) \
	$(call try-cflag,$(CC),-Wsuggest-attribute=const) \
	$(call try-cflag,$(CC),-Wsuggest-attribute=noreturn) \
	$(call try-cflag,$(CC),-Wno-error=suggest-attribute=const) \
	$(call try-cflag,$(CC),-Wno-error=suggest-attribute=noreturn) \
	$(call try-cflag,$(CC),-Wstack-usage=1024) \
	$(call try-cflag,$(CC),-Wno-error=array-bounds) \
	$(call try-cflag,$(CC),-Wno-error=stringop-overread) \
	$(call try-cflag,$(CC),-Wno-error=address-of-packed-member)

	CFLAGS += $(CWARNS) $(OPTS) $(DBG)

	LDFLAGS := -m64 -static -nostdlib -pie
	LDFLAGS += -Wl,-pie
	LDFLAGS += -Wl,-Ttext-segment,$(LD_TEXT) -Wl,-N -Wl,--build-id=none
	LDFLAGS += -Wl,--no-multi-toc
	ifeq ($(CONFIG_P8),1)
	LDFLAGS += -mcpu=power8
	else
	LDFLAGS += -mcpu=power9
	endif
	LDFLAGS += -Wl,--oformat,elf64-powerpc
	LDFLAGS_FINAL = -m elf64lppc --no-multi-toc -N --build-id=none --whole-archive
	LDFLAGS_FINAL += -static -nostdlib -pie -Ttext-segment=$(LD_TEXT) --oformat=elf64-powerpc
	LDFLAGS_FINAL += --orphan-handling=warn
	LDFLAGS_FINAL += $(call try-ldflag,$(LD),--no-warn-rwx-segments)

	LDRFLAGS=-melf64ppc
	# Debug stuff
	#LDFLAGS += -Wl,-v -Wl,-Map,foomap

	ifeq ($(LITTLE_ENDIAN),1)
	LDFLAGS += -mlittle-endian
	LDFLAGS_FINAL += -EL
	else
	LDFLAGS += -mbig-endian
	LDFLAGS_FINAL += -EB
	endif

	ifeq ($(DEAD_CODE_ELIMINATION),1)
	LDFLAGS += -Wl,--gc-sections
	LDFLAGS_FINAL += --gc-sections
	endif

	AFLAGS := -D__ASSEMBLY__ -m64
	ifeq ($(LITTLE_ENDIAN),1)
	AFLAGS += -mlittle-endian
	else
	AFLAGS += -mbig-endian
	endif

	ifeq ($(ELF_ABI_v2),1)
	AFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
	else
	AFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
	endif

	ifeq ($(cc-name),clang)
	CLANG_TARGET := --target=powerpc64-linux-gnu -mcpu=pwr8
	GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
	ifneq ($(GCC_TOOLCHAIN),)
	CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
	endif
	CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
	AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
	LDFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)

	# Workarounds
	# TODO: Fix the issues these hide, and remove them
	CFLAGS += -Wno-cast-align \
	-Wno-unused-command-line-argument \
	-Wno-unknown-warning-option \
	-Wno-gnu-variable-sized-type-not-at-end \
	-Wno-address-of-packed-member \
	-Wno-error=ignored-attributes

	# pci_add_device_nodes is the largest, at 2048 with clang-7 (smaller with older
	# versions)
	CFLAGS += -Wframe-larger-than=2048
	endif

	# Special tool flags:
	# Do not use the floating point unit
	CFLAGS += -msoft-float
	# Do not use string instructions
	CFLAGS += $(call try-cflag,$(CC),-mno-string)
	# do not use load/store multiple word instrcutions
	CFLAGS += $(call try-cflag,$(CC),-mno-multiple)
	# Do not use any automatic vector foo. While it would be safe during boot, we
	# don't save/restore across OPAL calls
	CFLAGS += -mno-vsx -mno-altivec

	# Do not use load/store update. You REALLY do not want to use this!
	# The async safety of the ABI stack depends on the atomicity
	# of update on store.
	#CFLAGS += -mno-update

	ifneq ($(KERNEL),)
	CPPFLAGS += -DBUILTIN_KERNEL="\"$(KERNEL)\""
	endif

	CHECK = sparse
	CHECKFLAGS := $(CF)
	CHECK_CFLAGS_SKIP = -std=gnu11

	.SECONDARY:

	vpath %.c $(SRC)
	vpath %.C $(SRC)
	vpath %.S $(SRC)

	default: all

	include/asm-offsets.h: asm/asm-offsets.s
	@mkdir -p include
	$(call Q,GN, $(SRC)/make_offsets.sh $< >$@, $@)

	TARGET = skiboot

	include $(SRC)/asm/Makefile.inc
	include $(SRC)/core/Makefile.inc
	include $(SRC)/hw/Makefile.inc
	include $(SRC)/platforms/Makefile.inc
	include $(SRC)/libfdt/Makefile.inc
	include $(SRC)/libflash/Makefile.inc
	include $(SRC)/libxz/Makefile.inc
	include $(SRC)/libpore/Makefile.inc
	include $(SRC)/libc/Makefile.inc
	include $(SRC)/ccan/Makefile.inc
	include $(SRC)/$(DEVSRC)/Makefile.inc
	include $(SRC)/libstb/Makefile.inc
	ifeq ($(CONFIG_PLDM),1)
	include $(SRC)/libmctp/Makefile.inc
	include $(SRC)/pldm/libpldm/Makefile.inc
	include $(SRC)/pldm/libpldm/oem/ibm/Makefile.inc
	endif

	# hack for travis-ci and coverity
	gard:
	(cd external/gard; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make)

	coverage: gard-coverage
	gard-coverage:
	(cd external/gard; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make coverage)

	pflash:
	(cd external/pflash; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make)

	coverage: pflash-coverage
	pflash-coverage:
	(cd external/pflash; CROSS_COMPILE="" CFLAGS="$(HOSTCFLAGS) $(HOSTGCOVCFLAGS)" make coverage)

	pflash-coverity:
	(cd external/pflash; ./build-all-arch.sh)

	all: $(SUBDIRS) $(TARGET).lid $(TARGET).lid.xz $(TARGET).map extract-gcov
	all: $(TARGET).lid.stb $(TARGET).lid.xz.stb

	OBJS := $(ASM) $(CORE) $(HW) $(PLATFORMS) $(LIBFDT) $(LIBXZ) $(LIBFLASH) $(LIBSTB)
	OBJS += $(LIBC) $(CCAN) $(DEVSRC_OBJ) $(LIBPORE)
	ifeq ($(CONFIG_PLDM),1)
	OBJS += $(LIBMCTP) $(LIBPLDM) $(LIBPLDM_IBM)
	endif
	OBJS_NO_VER = $(OBJS)
	ALL_OBJS = $(OBJS) version.o

	ALL_OBJS_1 = $(TARGET).tmp.a asm/dummy_map.o
	ALL_OBJS_2 = $(TARGET).tmp.a asm/real_map.o

	%.lid.xz: %.lid
	$(call Q,XZ, cat $^ \| xz -9 -C crc32 > $@, $@)

	%.lid: %.elf
	$(call Q,OBJCOPY, $(OBJCOPY) -O binary -S $^ $@, $@)

	$(TARGET).lid.stb: $(TARGET).lid libstb/create-container
	$(call Q,STB-DEVELOPMENT-SIGNED-CONTAINER,$(SRC)/libstb/sign-with-local-keys.sh $< $@ $(SRC)/libstb/keys/ PAYLOAD,$@)

	$(TARGET).lid.xz.stb: $(TARGET).lid.xz libstb/create-container
	$(call Q,STB-DEVELOPMENT-SIGNED-CONTAINER,$(SRC)/libstb/sign-with-local-keys.sh $< $@ $(SRC)/libstb/keys/ PAYLOAD,$@)

	$(TARGET).tmp.a: $(ALL_OBJS)
	@rm -f $(TARGET).tmp.a
	$(call Q,AR, $(AR) rcsTPD $@ $(ALL_OBJS), $@)

	$(TARGET).tmp.elf: $(ALL_OBJS_1) $(TARGET).lds $(KERNEL)
	$(call Q,LD, $(LD) $(LDFLAGS_FINAL) -o $@ -T $(TARGET).lds $(ALL_OBJS_1), $@)

	asm/real_map.o : $(TARGET).tmp.map

	$(TARGET).elf: $(ALL_OBJS_2) $(TARGET).lds $(KERNEL)
	$(call Q,LD, $(LD) $(LDFLAGS_FINAL) -o $@ -T $(TARGET).lds $(ALL_OBJS_2), $@)

	$(SUBDIRS):
	$(call Q,MKDIR,mkdir -p $@, $@)

	-include $(wildcard *.d)
	-include $(wildcard $(SUBDIRS:%=%/*.d))

	# Set V=1 if you want to see everything.
	include $(SRC)/Makefile.rules

	VERSION ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git $(SRC)/make_version.sh)

	.PHONY: VERSION-always
	.version: VERSION-always
	@echo $(VERSION) > $@.tmp
	@cmp -s $@ $@.tmp \|\| cp $@.tmp $@
	@rm -f $@.tmp

	version.c: $(SRC)/make_version.sh $(OBJS_NO_VER) .version
	@(if [ "a$(VERSION)" = "a" ]; then \
	echo "#error You need to set SKIBOOT_VERSION environment variable" > $@ ;\
	else \
	echo "extern const char version[];"; \
	echo "const char version[] = \"$(VERSION)\";" ;\
	fi) > $@

	.PHONY: coverage
	include $(shell find $(SRC)/* -name Makefile.check)

	extract-gcov: extract-gcov.c
	$(call Q, HOSTCC ,$(HOSTCC) $(HOSTCFLAGS) \
	-DTARGET__GNUC__=`echo '__GNUC__'\|$(CC) -E -\|grep -v '^#'` \
	-DTARGET__GNUC_MINOR__=`echo '__GNUC_MINOR__'\|$(CC) -E -\|grep -v '^#'` \
	-Wpadded -O0 -g -I$(SRC) -o $@ $<,$<)

	coverage-report: skiboot.info
	genhtml --branch-coverage -q -o $@ $<

	# A rather nasty hack here that relies on the lcov file format
	external/pflash/pflash.info: coverage
	(cd external/pflash; lcov -q -c -d . -o pflash.info --rc lcov_branch_coverage=1; sed -i -e 's%external/pflash/libflash%libflash%; s%external/pflash/ccan%ccan%' pflash.info)
	external/gard/gard.info: coverage
	(cd external/gard; lcov -q -c -d . -o gard.info --rc lcov_branch_coverage=1; sed -i -e 's%external/gard/libflash%libflash%; s%external/gard/ccan%ccan%' gard.info)

	skiboot.info: coverage external/pflash/pflash.info external/gard/gard.info
	lcov -q -c -d . $(LCOV_DIRS) -o $@ --rc lcov_branch_coverage=1
	lcov -q -r $@ 'external/pflash/*' -o $@
	lcov -q -r $@ 'external/gard/*' -o $@
	lcov -q -a $@ -a external/pflash/pflash.info -o $@
	lcov -q -a $@ -a external/gard/gard.info -o $@
	lcov -q -r $@ $(LCOV_EXCLUDE) -o $@ --rc lcov_branch_coverage=1

	doc:
	make -C doc html

	tags:
	find . -name '*.[chS]' \| xargs ctags

	TAGS:
	find . -name '*.[chS]' \| xargs etags

	.PHONY: tags TAGS check coverage doc

	cscope:
	find . -name '*.[chS]' \| xargs cscope

	clean:
	$(RM) .[odsa] $(SUBDIRS:%=%/.[odsa])
	$(RM) .gcno $(SUBDIRS:%=%/.gcno)
	$(RM) .gcda $(SUBDIRS:%=%/.gcda)
	$(RM) .elf $(TARGET).lid .map $(TARGET).lds $(TARGET).lid.xz
	$(RM) include/asm-offsets.h version.c .version
	$(RM) skiboot.info external/gard/gard.info external/pflash/pflash.info
	$(RM) extract-gcov $(TARGET).lid.stb $(TARGET).lid.xz.stb

	distclean: clean
	$(RM) ~ $(SUBDIRS:%=%/~) include/*~