electron/js2c_toolchain.gni

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# Copyright (c) 2023 Microsoft, GmbH
# Use of this source code is governed by the MIT license that can be
# found in the LICENSE file.
declare_args() {
electron_js2c_toolchain = ""
}
if (electron_js2c_toolchain == "") {
if (current_os == host_os && current_cpu == host_cpu) {
# This is not a cross-compile, so build the snapshot with the current
# toolchain.
electron_js2c_toolchain = current_toolchain
} else if (current_os == host_os && current_cpu == "x86" &&
host_cpu == "x64") {
# This is an x64 -> x86 cross-compile, but x64 hosts can usually run x86
# binaries built for the same OS, so build the snapshot with the current
# toolchain here, too.
electron_js2c_toolchain = current_toolchain
} else if (current_os == host_os && host_cpu == "arm64" &&
current_cpu == "arm") {
# Trying to compile 32-bit arm on arm64. Good luck!
electron_js2c_toolchain = current_toolchain
} else if (host_cpu == current_cpu) {
# Cross-build from same ISA on one OS to another. For example:
# * targeting win/x64 on a linux/x64 host
# * targeting win/arm64 on a mac/arm64 host
electron_js2c_toolchain = host_toolchain
} else if (host_cpu == "arm64" && current_cpu == "x64") {
# Cross-build from arm64 to intel (likely on an Apple Silicon mac).
electron_js2c_toolchain =
"//build/toolchain/${host_os}:clang_arm64_v8_$current_cpu"
} else if (host_cpu == "x64") {
# This is a cross-compile from an x64 host to either a non-Intel target
# cpu or to 32-bit x86 on a different target OS.
assert(current_cpu != "x64", "handled by host_cpu == current_cpu branch")
if (current_cpu == "x86") {
_cpus = current_cpu
} else if (current_cpu == "arm64") {
if (is_win) {
# set _cpus to blank for Windows ARM64 so host_toolchain could be
# selected as snapshot toolchain later.
_cpus = ""
} else {
_cpus = "x64_v8_${current_cpu}"
}
} else if (current_cpu == "arm") {
_cpus = "x86_v8_${current_cpu}"
} else {
# This branch should not be reached; leave _cpus blank so the assert
# below will fail.
_cpus = ""
}
if (_cpus != "") {
electron_js2c_toolchain = "//build/toolchain/${host_os}:clang_${_cpus}"
} else if (is_win && current_cpu == "arm64") {
# cross compile Windows arm64 with host toolchain.
electron_js2c_toolchain = host_toolchain
}
} else if (host_cpu == "arm64" && current_cpu == "arm64" &&
host_os == "mac") {
# cross compile iOS arm64 with host_toolchain
electron_js2c_toolchain = host_toolchain
}
}
assert(electron_js2c_toolchain != "",
"Do not know how to build js2c for $current_toolchain " +
"on $host_os $host_cpu")