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62 lines
2.5 KiB
Plaintext
62 lines
2.5 KiB
Plaintext
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# Copyright 2016 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/config/sanitizers/sanitizers.gni")
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declare_args() {
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# This arg is used when we want to tell the JIT-generating v8 code
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# that we want to have it generate for an architecture that is different
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# than the architecture that v8 will actually run on; we then run the
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# code under an emulator. For example, we might run v8 on x86, but
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# generate arm code and run that under emulation.
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#
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# This arg is defined here rather than in the v8 project because we want
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# some of the common architecture-specific args (like arm_float_abi or
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# mips_arch_variant) to be set to their defaults either if the current_cpu
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# applies *or* if the v8_current_cpu applies.
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#
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# As described below, you can also specify the v8_target_cpu to use
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# indirectly by specifying a `custom_toolchain` that contains v8_$cpu in the
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# name after the normal toolchain.
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#
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# For example, `gn gen --args="custom_toolchain=...:clang_x64_v8_arm64"`
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# is equivalent to setting --args=`v8_target_cpu="arm64"`. Setting
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# `custom_toolchain` is more verbose but makes the toolchain that is
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# (effectively) being used explicit.
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#
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# v8_target_cpu can only be used to target one architecture in a build,
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# so if you wish to build multiple copies of v8 that are targeting
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# different architectures, you will need to do something more
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# complicated involving multiple toolchains along the lines of
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# custom_toolchain, above.
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v8_target_cpu = ""
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}
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if (v8_target_cpu == "") {
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if (current_toolchain == "//build/toolchain/linux:clang_x64_v8_arm64") {
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v8_target_cpu = "arm64"
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} else if (current_toolchain == "//build/toolchain/linux:clang_x86_v8_arm") {
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v8_target_cpu = "arm"
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} else if (current_toolchain ==
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"//build/toolchain/linux:clang_x86_v8_mips64el") {
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v8_target_cpu = "mips64el"
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} else if (current_toolchain ==
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"//build/toolchain/linux:clang_x86_v8_mipsel") {
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v8_target_cpu = "mipsel"
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} else if (is_msan) {
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# If we're running under a sanitizer, if we configure v8 to generate
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# code that will be run under a simulator, then the generated code
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# also gets the benefits of the sanitizer.
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v8_target_cpu = "arm64"
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} else {
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v8_target_cpu = target_cpu
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}
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}
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declare_args() {
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# This argument is declared here so that it can be overridden in toolchains.
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# It should never be explicitly set by the user.
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v8_current_cpu = v8_target_cpu
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}
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