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# Copyright 2015 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Toolchain-related configuration that may be needed outside the context of the
# toolchain() rules themselves.
declare_args() {
# If this is set to true, we use the revision in the llvm repo to determine
# the CLANG_REVISION to use, instead of the version hard-coded into
# //tools/clang/scripts/update.py. This should only be used in
# conjunction with setting the llvm_force_head_revision DEPS variable when
# `gclient runhooks` is run as well.
llvm_force_head_revision = false
# Cronet is shipped in AOSP, where it is built using the Android Mainline
# Clang. Please refer to go/cronet-builders-with-mainline-clang-design for
# more information.
# If this arg is set to true, we use the Android Mainline LLVM.
llvm_android_mainline = false
# Used for binary size analysis.
generate_linker_map = is_android && is_official_build
# Whether this toolchain is to be used for building host tools that are
# consumed during the build process. That includes proc macros and Cargo build
# scripts.
toolchain_for_rust_host_build_tools = false
# If false, the toolchain overrides `use_partition_alloc_as_malloc` in
# PartitionAlloc, to allow use of the system allocator.
toolchain_allows_use_partition_alloc_as_malloc = true
}
declare_args() {
if (llvm_android_mainline) { # https://crbug.com/1481060
clang_version = "17"
} else {
clang_version = "21"
}
}
# Extension for shared library files (including leading dot).
if (is_apple) {
shlib_extension = ".dylib"
} else if (is_posix || is_fuchsia) {
shlib_extension = ".so"
} else if (is_win) {
shlib_extension = ".dll"
} else if (is_wasm) {
# WebAssembly does not stably support shared libraries. (as of Oct 2019)
shlib_extension = ".wasm"
} else {
assert(false, "Platform not supported")
}
# Same extension but for the host platform. We have significantly fewer host
# platforms.
if (host_os == "mac") {
host_shlib_extension = ".dylib"
} else if (host_os == "win") {
host_shlib_extension = ".dll"
} else if (host_os == "linux" || host_os == "aix" || host_os == "zos") {
host_shlib_extension = ".so"
} else {
assert(false, "Host platform not supported")
}
# Prefix for shared library files.
if (is_posix || is_fuchsia) {
shlib_prefix = "lib"
} else {
shlib_prefix = ""
}
# Directory for shared library files.
if (is_fuchsia) {
shlib_subdir = "/lib"
} else {
shlib_subdir = ""
}
# While other "tool"s in a toolchain are specific to the target of that
# toolchain, the "stamp" and "copy" tools are really generic to the host;
# but each toolchain must define them separately. GN doesn't allow a
# template instantiation inside a toolchain definition, so some boilerplate
# has to be repeated in each toolchain to define these two tools. These
# four variables reduce the duplication in that boilerplate.
stamp_description = "STAMP {{output}}"
copy_description = "COPY {{source}} {{output}}"
if (host_os == "win") {
_tool_wrapper_path =
rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir)
stamp_command = "cmd /c type nul > \"{{output}}\""
copy_command = "\"$python_path\" $_tool_wrapper_path recursive-mirror {{source}} {{output}}"
} else {
stamp_command = "touch {{output}}"
copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
}
# This variable is true if the current toolchain is one of the target
# toolchains, i.e. a toolchain which is being used to build the main Chrome
# binary. This generally means "not the host toolchain", but in the case where
# we're targeting the host it's true then as well. We do require current_os to
# match target_os so that for example we avoid considering Android as a target
# toolchain when targeting CrOS.
is_a_target_toolchain =
(current_toolchain != host_toolchain ||
default_toolchain == host_toolchain) && current_os == target_os
# A toolchain for building tools that run on the host machine and need to use
# the system allocator. This toolchain does not use PartitionAlloc-Everywhere by
# design. We use a name with `_host` injected into it to avoid colliding with
# toolchains of the same name (but different path) between different OSes.
host_system_allocator_toolchain = "${host_toolchain}_host_with_system_allocator"
# A toolchain for building tools that run on the default target machine and need
# to use the system allocator. This toolchain does not use
# PartitionAlloc-Everywhere by design.
default_system_allocator_toolchain =
"${default_toolchain}_with_system_allocator"
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