Makefile.toolchain

# -*- makefile -*-
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Toolchain configuration build system
#

# Toolchain configuration

min_make_version:=3.82
make_version_ok:=$(filter $(min_make_version), \
	$(firstword $(sort $(MAKE_VERSION) $(min_make_version))))
ifeq ($(make_version_ok),)
$(error ERROR: GNU make version $(min_make_version) or higher required.)
endif

# Default to clang if TEST_ASAN is enabled
ifneq ($(TEST_ASAN),)
CC=clang
endif

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

# Try not to assume too much about optional tools and prefixes
CCACHE:=$(shell which ccache 2>/dev/null)
ifeq ($(origin HOST_CROSS_COMPILE),undefined)
HOST_CROSS_COMPILE:=$(if $(shell which x86_64-pc-linux-gnu-gcc 2>/dev/null),x86_64-pc-linux-gnu-,)
endif

CC=$(CCACHE) $(CROSS_COMPILE)$(cc-name)
CPP=$(CC) -E
LD=$(CROSS_COMPILE)ld
NM=$(CROSS_COMPILE)nm
OBJCOPY=$(CROSS_COMPILE)objcopy
OBJDUMP=$(CROSS_COMPILE)objdump
ADDR2LINE=$(CROSS_COMPILE)addr2line
PKG_CONFIG?=pkg-config
BUILDCC?=$(CCACHE) gcc
HOSTCC?=$(CCACHE) $(HOST_CROSS_COMPILE)gcc
HOSTCXX?=$(CCACHE) $(HOST_CROSS_COMPILE)g++

C_WARN = -Wstrict-prototypes -Wdeclaration-after-statement -Wno-pointer-sign
COMMON_WARN = -Wall -Werror -Wundef -Wno-trigraphs -fno-strict-aliasing \
	-fno-common -Werror-implicit-function-declaration \
	-Wno-format-security -fno-strict-overflow
ifeq ($(cc-name),clang)
# clang is pickier when it comes to packed struct members alignment.
C_WARN+= -Wno-address-of-packed-member
endif
CFLAGS_WARN = $(COMMON_WARN) $(C_WARN)
CXXFLAGS_WARN = $(COMMON_WARN)
CFLAGS_DEBUG= -g
CFLAGS_DEBUG+=$(CFLAGS_DEBUG_CHIP)
CFLAGS_INCLUDE=$(foreach i,$(includes),-I$(i) ) -I.
CFLAGS_TEST=$(if $(TEST_BUILD),-DTEST_BUILD \
                               -DTEST_TASKFILE=$(PROJECT).tasklist,) \
            $(if $(CTS_MODULE), $(CFLAGS_CTS)) \
            $(if $(EMU_BUILD),-DEMU_BUILD) \
            $(if $($(PROJECT)-scale),-DTEST_TIME_SCALE=$($(PROJECT)-scale)) \
            -DTEST_$(PROJECT) -DTEST_$(UC_PROJECT) \
            $(if $(TEST_ASAN),-fsanitize=address)
CFLAGS_COVERAGE=$(if $(TEST_COVERAGE),-fprofile-arcs -ftest-coverage \
				      -DTEST_COVERAGE,)
CFLAGS_DEFINE=-DOUTDIR=$(out)/$(BLD) -DCHIP=$(CHIP) -DBOARD_TASKFILE=$(_tsk_lst_file) \
              -DBOARD=$(BOARD) -DCORE=$(CORE) -DPROJECT=$(PROJECT) \
              -DCHIP_VARIANT=$(CHIP_VARIANT) -DCHIP_FAMILY=$(CHIP_FAMILY) \
              -DBOARD_$(UC_BOARD) -DCHIP_$(UC_CHIP) -DCORE_$(UC_CORE) \
              -DCHIP_VARIANT_$(UC_CHIP_VARIANT) -DCHIP_FAMILY_$(UC_CHIP_FAMILY) \
	      -DFINAL_OUTDIR=$(out) $(CFLAGS_BASEBOARD)
CPPFLAGS=$(CFLAGS_DEFINE) $(CFLAGS_INCLUDE) $(CFLAGS_TEST) \
	 $(EXTRA_CFLAGS) $(CFLAGS_COVERAGE) $(LATE_CFLAGS_DEFINE) \
	-DSECTION_IS_$(BLD) -DSECTION=$(BLD) $(CPPFLAGS_$(BLD))
BUILD_CPPFLAGS=$(CFLAGS_DEFINE) -Icore/host $(CFLAGS_INCLUDE) $(CFLAGS_TEST) \
	 $(EXTRA_CFLAGS) $(CFLAGS_COVERAGE) $(LATE_CFLAGS_DEFINE) \
	 -DSECTION_IS_$(BLD) -DSECTION=$(BLD) $(CPPFLAGS_$(BLD))
HOST_CPPFLAGS=$(CFLAGS_DEFINE) $(CFLAGS_INCLUDE) $(CFLAGS_TEST) \
	 $(EXTRA_CFLAGS) $(CFLAGS_COVERAGE) $(LATE_CFLAGS_DEFINE) \
	 -DSECTION_IS_$(BLD) -DSECTION=$(BLD) $(CPPFLAGS_$(BLD))
ifneq ($(BOARD),host)
CPPFLAGS+=-ffreestanding -fno-builtin -nostdinc -nostdlib
CPPFLAGS+=-Ibuiltin/
endif
CFLAGS=$(CPPFLAGS) $(CFLAGS_CPU) $(CFLAGS_DEBUG) $(CFLAGS_WARN) $(CFLAGS_y)
CFLAGS+= -ffunction-sections -fshort-wchar
ifneq ($(cc-name),clang)
# TODO(chromium:854924): LLVM support for this flag is coming soon.
CFLAGS+= -fno-delete-null-pointer-checks
CFLAGS+= -fconserve-stack
endif
CFLAGS+= -DCHROMIUM_EC

FTDIVERSION=$(shell $(PKG_CONFIG) --modversion libftdi1 2>/dev/null)
ifneq ($(FTDIVERSION),)
  LIBFTDI_NAME=ftdi1
else
  LIBFTDI_NAME=ftdi
endif

LIBFTDI_CFLAGS=$(shell $(PKG_CONFIG) --cflags lib${LIBFTDI_NAME})
LIBFTDI_LDLIBS=$(shell $(PKG_CONFIG) --libs   lib${LIBFTDI_NAME})

BUILD_CFLAGS= $(LIBFTDI_CFLAGS) $(BUILD_CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
HOST_CFLAGS=$(HOST_CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN) -DHOST_TOOLS_BUILD
LDFLAGS=-nostdlib -g -Wl,-X -Wl,--gc-sections -Wl,--build-id=none \
	$(LDFLAGS_EXTRA) $(CFLAGS_CPU)
BUILD_LDFLAGS=$(LIBFTDI_LDLIBS)
HOST_TEST_LDFLAGS=-Wl,-T core/host/host_exe.lds -lrt -pthread -rdynamic -lm\
		  $(if $(TEST_COVERAGE),-fprofile-arcs,) \
		  $(if $(TEST_ASAN), -fsanitize=address)

# utility function to provide overridable defaults
# $1: name of variable to set
# $2: first default to use
# $3: second default to use
set-option = $(eval $1=$$(if $(2),$(2),$(3)))