#
# Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version2 only, as
# published by the Free Software Foundation. Oracle designates this
# particular file as subject to the "Classpath" exception as provided
# by Oracle in the LICENSE file that accompanied this code.
#
# This code 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
# version2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#
################################################################################
#
# This Makefile, together with Tools.gmk, can be used to compile a set of
# gcc based cross compilation, portable, self contained packages, capable
# of building OpenJDK.
#
# By default this Makefile will build a native toolchain for the current
# platform if called with something like this:
#
# make tars BASE_OS=OL
#
# To build the full set of crosstools for additional platforms, use a command
# line looking like this:
#
# make TARGETS="aarch64-linux-gnu" BASE_OS=Fedora
# or
# make TARGETS="arm-linux-gnueabihf ppc64-linux-gnu" BASE_OS=Fedora BASE_OS_VERSION=17
#
# to build several devkits for a specific OS version at once.
# You can find the final results under ../../build/devkit/result/<host>-to-<target>
#
# You may want the native toolchain to be used when compiling the cross
# compilation toolchains. To achieve this, first build the native toolchain,
# then add the bin directory from this build to the path when invoking this
# makefile again for cross compilation. Ex:
#
# PATH=$PWD/../../build/devkit/result/x86_64-linux-gnu-to-x86_64-linux-gnu/bin:$PATH \
# make TARGETS="arm-linux-gnueabihf,ppc64-linux-gnu" BASE_OS=Fedora
#
# This is the makefile which iterates over all host and target platforms.
#
COMMA := ,
os := $(shell uname -o)
cpu := $(shell uname -p)
# Figure out what platform this is building on.
me := $(cpu)-$(if $(findstring Linux,$(os)),linux-gnu)
$(info Building on platform $(me))
#
# By default just build for the current platform, which is assumed to be Linux
#
ifeq ($(TARGETS), )
platforms := $(me)
host_platforms := $(platforms)
else
platforms := $(subst $(COMMA), , $(TARGETS))
host_platforms := $(me)
endif
target_platforms := $(platforms)
$(info host_platforms $(host_platforms))
$(info target_platforms $(target_platforms))