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# Copyright 2025 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//build/toolchain/gcc_toolchain.gni")
declare_args() {
# Path to emsdk directory.
emscripten_path = "//third_party/emsdk/upstream/emscripten/"
}
# This WASM toolchain is NOT to be used to build any Chromium code,
# i.e. tests and samples are currently fine.
# Usage of this toolchain requires getting explicit approval from
# build/OWNERS.
gcc_toolchain("wasm") {
_suffix = ""
if (host_os == "win") {
_suffix = ".bat"
}
cc = rebase_path("$emscripten_path/emcc$_suffix", root_build_dir)
cxx = rebase_path("$emscripten_path/em++$_suffix", root_build_dir)
ar = rebase_path("$emscripten_path/emar$_suffix", root_build_dir)
nm = cc
ld = cxx
toolchain_args = {
current_cpu = "wasm"
current_os = "emscripten"
is_clang = true
use_remoteexec = false
use_debug_fission = false
clang_use_chrome_plugins = false
use_allocator_shim = false
is_component_build = false
# We do not support clang profiling in the WASM toolchains.
use_clang_profiling = false
use_clang_coverage = false
# WASM builds cannot currently use the custom libc++ because
# there are custom entry points and defines in the one that is
# shipped with emsdk.
use_custom_libcxx = false
use_custom_libcxx_for_host = false
}
executable_extension = ".html"
link_outputs = [
"{{output_dir}}/{{target_output_name}}.wasm",
"{{output_dir}}/{{target_output_name}}.wasm.debug.wasm",
]
}
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