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104 lines
4.6 KiB
Plaintext
104 lines
4.6 KiB
Plaintext
# Copyright 2015 the V8 project authors. All rights reserved.
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import("//build/config/v8_target_cpu.gni")
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declare_args() {
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# The v8 snapshot needs to be built by code that is compiled with a
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# toolchain that matches the bit-width of the target CPU, but runs on
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# the host.
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v8_snapshot_toolchain = ""
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}
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# Try to infer the appropriate snapshot toolchain for the v8_current_cpu
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# where possible.
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#
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# Assume that v8_target_cpu (and hence v8_current_cpu) has been validated
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# as supported on the current host CPU and OS in v8_target_cpu.gni. The
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# logic below is complicated enough without also needing to do input
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# validation.
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#
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# There are test cases for this code posted as an attachment to
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# https://crbug.com/625353.
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#
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# TODO(GYP): Currently only regular (non-cross) compiles, and cross-compiles
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# from x64 hosts to Intel, ARM, or MIPS targets, are implemented. Add support
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# for the other supported configurations.
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if (v8_snapshot_toolchain == "") {
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if (current_os == host_os && current_cpu == host_cpu) {
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# This is not a cross-compile, so build the snapshot with the current
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# toolchain.
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v8_snapshot_toolchain = current_toolchain
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} else if (current_os == host_os && current_cpu == "x86" &&
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host_cpu == "x64") {
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# This is an x64 -> x86 cross-compile, but x64 hosts can usually run x86
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# binaries built for the same OS, so build the snapshot with the current
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# toolchain here, too.
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v8_snapshot_toolchain = current_toolchain
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} else if (current_os == "win" && host_os == "mac" && is_clang) {
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# This is a mac -> win cross-compile, which is only supported w/ clang.
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v8_snapshot_toolchain = "//build/toolchain/mac:clang_${v8_current_cpu}"
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} else if (host_cpu == "x64" &&
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(v8_current_cpu == "mips" || v8_current_cpu == "mips64")) {
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# We don't support snapshot generation for big-endian targets,
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# therefore snapshots will need to be built using native mksnapshot
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# in combination with qemu
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v8_snapshot_toolchain = current_toolchain
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} else if (host_cpu == "x64") {
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# This is a cross-compile from an x64 host to either a non-Intel target
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# cpu or a different target OS. Clang will always be used by default on the
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# host, unless this is a ChromeOS build, in which case the same toolchain
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# (Clang or GCC) will be used for target and host by default.
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if (is_chromeos && !is_clang) {
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_clang = ""
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} else {
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_clang = "clang_"
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}
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if (v8_current_cpu == "x64" || v8_current_cpu == "x86") {
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_cpus = v8_current_cpu
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} else if (v8_current_cpu == "arm64" || v8_current_cpu == "mips64el") {
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_cpus = "x64_v8_${v8_current_cpu}"
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} else if (v8_current_cpu == "arm" || v8_current_cpu == "mipsel") {
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_cpus = "x86_v8_${v8_current_cpu}"
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} else {
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# This branch should not be reached; leave _cpus blank so the assert
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# below will fail.
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_cpus = ""
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}
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if (_cpus != "") {
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v8_snapshot_toolchain = "//build/toolchain/${host_os}:${_clang}${_cpus}"
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}
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}
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}
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assert(v8_snapshot_toolchain != "",
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"Do not know how to build a snapshot for $current_toolchain " +
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"on $host_os $host_cpu")
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