linux/tools/power/acpi/Makefile.config

# tools/power/acpi/Makefile.config - ACPI tool Makefile
#
# Copyright (c) 2015, Intel Corporation
#   Author: Lv Zheng <lv.zheng@intel.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2
# of the License.

ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
#$(info Determined 'srctree' to be $(srctree))
endif

include $(srctree)/../../scripts/Makefile.include

OUTPUT=$(srctree)/
ifeq ("$(origin O)", "command line")
	OUTPUT := $(O)/power/acpi/
endif
#$(info Determined 'OUTPUT' to be $(OUTPUT))

# --- CONFIGURATION BEGIN ---

# Set the following to `true' to make a unstripped, unoptimized
# binary. Leave this set to `false' for production use.
DEBUG ?=	true

# make the build silent. Set this to something else to make it noisy again.
V ?=		false

# Prefix to the directories we're installing to
DESTDIR ?=

# --- CONFIGURATION END ---

# Directory definitions. These are default and most probably
# do not need to be changed. Please note that DESTDIR is
# added in front of any of them

bindir ?=	/usr/bin
sbindir ?=	/usr/sbin
mandir ?=	/usr/man

# Toolchain: what tools do we use, and what options do they need:

INSTALL = /usr/bin/install -c
INSTALL_PROGRAM = ${INSTALL}
INSTALL_DATA  = ${INSTALL} -m 644
INSTALL_SCRIPT = ${INSTALL_PROGRAM}

# If you are running a cross compiler, you may want to set this
# to something more interesting, like "arm-linux-".  If you want
# to compile vs uClibc, that can be done here as well.
CROSS = #/usr/i386-linux-uclibc/usr/bin/i386-uclibc-
CROSS_COMPILE ?= $(CROSS)
HOSTCC = gcc

# check if compiler option is supported
cc-supports = ${shell if $(CC) ${1} -S -o /dev/null -x c /dev/null > /dev/null 2>&1; then echo "$(1)"; fi;}

# use '-Os' optimization if available, else use -O2
OPTIMIZATION := $(call cc-supports,-Os,-O2)

WARNINGS := -Wall
WARNINGS += $(call cc-supports,-Wstrict-prototypes)
WARNINGS += $(call cc-supports,-Wdeclaration-after-statement)

KERNEL_INCLUDE := $(OUTPUT)include
ACPICA_INCLUDE := $(srctree)/../../../drivers/acpi/acpica
CFLAGS += -D_LINUX -I$(KERNEL_INCLUDE) -I$(ACPICA_INCLUDE)
CFLAGS += $(WARNINGS)

ifeq ($(strip $(V)),false)
	QUIET=@
	ECHO=@echo
else
	QUIET=
	ECHO=@\#
endif

# if DEBUG is enabled, then we do not strip or optimize
ifeq ($(strip $(DEBUG)),true)
	CFLAGS += -O1 -g -DDEBUG
	STRIPCMD = /bin/true -Since_we_are_debugging
else
	CFLAGS += $(OPTIMIZATION) -fomit-frame-pointer
	STRIPCMD = $(STRIP) -s --remove-section=.note --remove-section=.comment
endif