#
#    Copyright (c) 2015 Nest Labs, 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 building LTTng kernel module.
#

include pre.mak
include products/paths.mak

PackageName			:= lttng-modules
PackageExtension		:= tar.bz2
PackageSeparator		:= -
PackagePatchArgs		:= -p1
PackageArchive			:= $(PackageName).$(PackageExtension)
PackageSourceDir		:= $(PackageName)$(PackageSeparator)$(PackageVersion)
PackageBuildReadmeFile		:= $(call GenerateBuildPaths,README.md)

CleanPaths			+= $(PackageLicenseFile)

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

all: $(PackageDefaultGoal)

# Generate the package license contents.

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

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

$(PackageSourceDir): $(PackageArchive) $(PackagePatchPaths)
	$(call expand-archive,$(PackageArchive),.)
	$(Verbose)touch $(@)
	$(call patch-directory,$(@),$(PackagePatchArgs),$(PackagePatchPaths))

# Prepare the sources.

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

# Patch the sources, if necessary.

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

# Clone the source tree.

$(PackageBuildReadmeFile): | $(PackageSourceDir) $(BuildDirectory)
	$(call create-links,$(CURDIR)/$(PackageSourceDir),$(BuildDirectory))

# Configure the source for building.

$(BuildDirectory)/configure: $(BuildDirectory)/source $(PackageBuildReadmeFile)
	$(Verbose)touch $@

# Build the source.
#
# We have to unset MAKEFLAGS since they confuse the package build otherwise.
#
# This package 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 build infrastructure can
# find $(CROSS_COMPILE)gcc, $(CROSS_COMPILE)ld, et al.

$(BuildDirectory)/build $(BuildDirectory)/stage: PATH := $(PATH):$(ToolBinDir)

$(BuildDirectory)/build: $(BuildDirectory)/configure $(LinuxBuildDir)/build | $(BuildDirectory)
	$(Verbose)unset MAKEFLAGS && \
	$(MAKE) $(JOBSFLAG) -C $(BuildDirectory) \
	ARCH=$(LinuxProductArch) \
	KERNELDIR=$(LinuxBuildDir)
	$(Verbose)touch $@

# Stage the build to a temporary installation area.

$(BuildDirectory)/stage: $(BuildDirectory)/build | $(ResultDirectory)
	$(Verbose)unset MAKEFLAGS && \
	$(MAKE) $(JOBSFLAG) -C $(BuildDirectory) \
	ARCH=$(LinuxProductArch) \
	KERNELDIR=$(LinuxBuildDir) \
	"INSTALL_MOD_DIR=extras/" \
	"INSTALL_MOD_PATH=$(LinuxResultsPath)" \
	DEPMOD=$(DEPMOD) \
	modules_install
	$(Verbose)touch $@

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

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

include post.mak