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#
# Make pre-include environment Makefile.
#
# Copyright (C) 2009, Cisco Systems Inc.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Garrett Cooper, September 2009
#
# This Makefile must be included first. NO IF'S, AND'S, OR BUT'S.
#
# This sets the stage for all operations required within Makefiles.
#
ifndef ENV_PRE_LOADED
ENV_PRE_LOADED = 1
# "out-of-build-tree" build.
BUILD_TREE_BUILDDIR_INSTALL := 1
# "in-srcdir" build / install.
BUILD_TREE_SRCDIR_INSTALL := 2
# "in-srcdir" build, non-srcdir install.
BUILD_TREE_NONSRCDIR_INSTALL := 3
# configure not run.
BUILD_TREE_UNCONFIGURED := 4
ifndef MAKE_VERSION_CHECK
export MAKE_VERSION_CHECK = 1
ifneq ($(firstword $(sort 3.80 $(MAKE_VERSION))),3.80)
$(error Your version of make $(MAKE_VERSION) is too old. Upgrade to at least 3.80; 3.81+ is preferred)
else
ifneq ($(filter 3.80%,$(MAKE_VERSION)),)
export MAKE_3_80_COMPAT := 1
endif # make 3.80?
endif # At least make 3.80?
endif # MAKE_VERSION_CHECK
# Get the absolute path for the source directory.
top_srcdir ?= $(error You must define top_srcdir before including this file)
include $(top_srcdir)/include/mk/functions.mk
# Where's the root source directory?
ifdef MAKE_3_80_COMPAT
abs_top_srcdir := $(call MAKE_3_80_abspath,$(top_srcdir))
else
abs_top_srcdir := $(abspath $(top_srcdir))
endif
#
# Where's the root object directory?
#
# Just in case it's not specified, set it to the top srcdir (because the user
# must not have wanted out of build tree support)...
#
top_builddir ?= $(top_srcdir)
# We need the absolute path...
ifdef MAKE_3_80_COMPAT
abs_top_builddir := $(call MAKE_3_80_abspath,$(top_builddir))
else
abs_top_builddir := $(abspath $(top_builddir))
endif
# Where's the root object directory?
builddir := .
abs_builddir := $(CURDIR)
cwd_rel_from_top := $(subst $(abs_top_builddir),,$(abs_builddir))
# Where's the source located at? Squish all of the / away by using abspath...
ifdef MAKE_3_80_COMPAT
abs_srcdir := $(call MAKE_3_80_abspath,$(abs_top_srcdir)/$(cwd_rel_from_top))
else
abs_srcdir := $(abspath $(abs_top_srcdir)/$(cwd_rel_from_top))
endif
srcdir := $(strip $(subst $(abs_top_srcdir)/,,$(abs_srcdir)))
ifeq ($(srcdir),)
srcdir := .
endif
# autotools, *clean, and help don't require config.mk, features.mk, etc...
ifeq ($(filter autotools %clean .gitignore gitignore.% help,$(MAKECMDGOALS)),)
include $(abs_top_builddir)/include/mk/config.mk
include $(abs_top_builddir)/include/mk/features.mk
# START out-of-build-tree check.
ifneq ($(abs_builddir),$(abs_srcdir))
BUILD_TREE_STATE := $(BUILD_TREE_BUILDDIR_INSTALL)
else
# Else, not out of build tree..
# START srcdir build-tree install checks
ifeq ($(strip $(DESTDIR)$(prefix)),)
BUILD_TREE_STATE := $(BUILD_TREE_SRCDIR_INSTALL)
else # Empty $(DESTDIR)$(prefix)
ifeq ($(abs_top_srcdir),$(prefix))
BUILD_TREE_STATE := $(BUILD_TREE_SRCDIR_INSTALL)
endif
# END srcdir build-tree install checks
endif
# END out-of-build-tree check.
endif
# Is the build-tree configured yet?
ifeq ($(BUILD_TREE_STATE),)
ifneq ($(wildcard $(abs_top_builddir)/include/mk/config.mk),)
BUILD_TREE_STATE := $(BUILD_TREE_NONSRCDIR_INSTALL)
endif
endif
ifeq ($(MAKE_3_80_COMPAT),1)
# Trick make 3.80 into thinking that the default goal is all.
.PHONY: default
default: all
else
.DEFAULT_GOAL := all
endif
endif # END autotools, *clean...
BUILD_TREE_STATE ?= $(BUILD_TREE_UNCONFIGURED)
# We can piece together where we're located in the source and object trees with
# just these two vars and $(CURDIR).
export abs_top_srcdir abs_top_builddir BUILD_TREE_STATE
endif
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