#
#    Copyright (c) 2010-2011 Nest, Inc.
#    All rights reserved.
#
#    This document is the property of Nest. It is considered
#    confidential and proprietary information.
#
#    This document may not be reproduced or transmitted in any form,
#    in whole or in part, without the express written permission of
#    Nest.
#
#    Description:
#      This file is the makefile for embedded Linux "Swiss Army Knife"
#      application, BusyBox.
#

include pre.mak

PackageName		:= busybox

PackageExtension	:= tar.bz2
PackageSeparator	:= -

PackagePatchArgs	:= -p1

PackageArchive		:= $(PackageName).$(PackageExtension)
PackageSourceDir	:= $(PackageName)$(PackageSeparator)$(PackageVersion)

PackageBuildMakefile	= $(call GenerateBuildPaths,Makefile)

CleanPaths		+= $(PackageLicenseFile)

SOURCEDIRS                      = $(PackageSourceDir) configs
$(PackageSourceDir)_RULE_TARGET = $(BuildDirectory)/configure
configs_RULE_TARGET             = $(BuildDirectory)/configure

all: $(PackageDefaultGoal)

# Generate the package license contents.

$(PackageSourceDir)/LICENSE: $(BuildDirectory)/source

$(PackageLicenseFile): $(PackageSourceDir)/LICENSE
	$(copy-result)

# Extract the source from the archive and apply patches, if any.

$(PackageSourceDir): $(PackageArchive) $(PackagePatchPaths)
	$(expand-and-patch-package)

# Prepare the sources.

$(BuildDirectory)/source: | $(PackageSourceDir) $(BuildDirectory)
	$(Verbose)touch $@

# Patch the sources, if necessary.

$(BuildDirectory)/patch: $(BuildDirectory)/source
	$(Verbose)touch $@

# BusyBox has no way of explicitly setting CC, LD, OBJCOPY, et al and
# instead relies on the value of CROSS_COMPILE. Consequently, we have
# to ensure that 'ToolBinDir' is in 'PATH' so that the kernel build
# infrastructure can find $(CROSS_COMPILE)gcc, $(CROSS_COMPILE)ld, et
# al.

BusyboxCFlags := \
    $(if $(ToolSysRootDir),--sysroot=$(ToolSysRootDir)) \
    $(CPPOPTFLAGS) \
    $(call ToolGenerateIncludeArgument,$(LinuxIncludePath)) \
    $(NULL)

$(BuildDirectory)/configure $(BuildDirectory)/build $(BuildDirectory)/stage: PATH := $(PATH):$(ToolBinDir)
$(BuildDirectory)/configure $(BuildDirectory)/build $(BuildDirectory)/stage: export CFLAGS := $(BusyboxCFlags)

# Generate the package build makefile and default configuration based
# on the build configuration.

# Configure the source for building.

$(BuildDirectory)/configure: $(BuildDirectory)/source $(CURDIR)/configs/$(BuildConfig)_defconfig | $(PackageSourceDir) $(BuildDirectory)
	$(Verbose)$(RM) $(RMFLAGS) $(BuildDirectory)/scripts/kconfig/conf
	$(Verbose)$(MAKE) -C $(PackageSourceDir) O=$(CURDIR)/$(BuildDirectory) $(CURDIR)/configs/$(BuildConfig)_defconfig
	$(Verbose)touch $@

# Build the source.

$(BuildDirectory)/build: $(BuildDirectory)/configure
	$(Verbose)$(MAKE) -C $(BuildDirectory) busybox
	$(Verbose)touch $@

# Stage the build to a temporary installation area.

$(BuildDirectory)/stage: $(BuildDirectory)/build | $(ResultDirectory)
	$(Verbose)$(MAKE) -C $(BuildDirectory) INSTALL="$(INSTALL) $(INSTALLFLAGS)" CONFIG_PREFIX=$(ResultDirectory) install
	$(Verbose)touch $@

.PHONY: stage
stage: $(BuildDirectory)/stage

clean:
	$(Verbose)$(RM) $(RMFLAGS) -r $(PackageSourceDir)
	$(Verbose)$(RM) $(RMFLAGS) -r $(BuildDirectory)
	$(Verbose)$(RM) $(RMFLAGS) -r $(ResultDirectory)

include post.mak