71 lines
2.7 KiB
Text
71 lines
2.7 KiB
Text
# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import("//build/toolchain/gcc_toolchain.gni")
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# CrOS builds must cross-compile on a Linux host for the actual CrOS
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# device target. There are many different CrOS devices so the build
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# system provides configuration variables that permit a CrOS build to
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# control the cross-compilation tool chain. However, requiring such
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# fine-grain specification is tedious for build-bots and developers.
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# Consequently, the CrOS build system defaults to a convenience
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# compilation mode where the compilation host is also the build target.
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#
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# Chrome can be compiled in this way with the gn variable:
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#
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# target_os = "chromeos"
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#
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# To perform a board-specific build, first obtain the correct system
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# root (http://goo.gl/aFB4XH) for the board. Then configure GN to use it
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# by setting appropriate cross-compilation variables.
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#
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# For example, to compile a Chrome source tree in /g/src for an
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# auron_paine CrOS device with the system root cached in /g/.cros_cache,
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# the following GN arguments must be provided to configure
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# cross-compilation with Goma acceleration. (NB: additional variables
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# will be necessary to successfully compile a working CrOS Chrome. See
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# the definition of GYP_DEFINES inside a sysroot shell.)
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#
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# goma_dir = "/g/.cros_cache/common/goma+2"
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# target_sysroot= /g/.cros_cache/chrome-sdk/tarballs/auron_paine+7644.0.0+sysroot_chromeos-base_chromeos-chrome.tar.xz"
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# cros_target_cc = "x86_64-cros-linux-gnu-gcc -B/g/.cros_cache/chrome-sdk/tarballs/auron_paine+7657.0.0+target_toolchain/usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.25.51-gold"
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# cros_target_cxx = "x86_64-cros-linux-gnu-g++ -B/g/.cros_cache/chrome-sdk/tarballs/auron_paine+7657.0.0+target_toolchain/usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.25.51-gold"
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# cros_target_ar = "x86_64-cros-linux-gnu-gcc-ar"
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# target_cpu = "x64"
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declare_args() {
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# These must be specified for a board-specific build.
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cros_target_cc = ""
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cros_target_cxx = ""
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cros_target_ar = ""
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}
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clang_toolchain("clang_target") {
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toolchain_cpu = target_cpu
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toolchain_os = "linux"
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}
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gcc_toolchain("target") {
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# These defaults permit building on a Linux host as described above.
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cc = "gcc"
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cxx = "g++"
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ar = "ar"
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# But to build for a specific board, the cros_* args will need to be defined.
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if (cros_target_cc != "") {
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cc = "${cros_target_cc}"
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}
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if (cros_target_cxx != "") {
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cxx = "${cros_target_cxx}"
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}
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if (cros_target_ar != "") {
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ar = "${cros_target_ar}"
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}
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ld = cxx
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toolchain_cpu = target_cpu
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toolchain_os = "linux"
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is_clang = is_clang
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cc_wrapper = ""
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}
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