1 # Copyright 2015 The Chromium Authors
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
5 # Toolchain-related configuration that may be needed outside the context of the
6 # toolchain() rules themselves.
8 import("//build/config/chrome_build.gni")
9 import("//build/config/chromecast_build.gni")
10 import("//build_overrides/build.gni")
13 # If this is set to true, we use the revision in the llvm repo to determine
14 # the CLANG_REVISION to use, instead of the version hard-coded into
15 # //tools/clang/scripts/update.py. This should only be used in
16 # conjunction with setting the llvm_force_head_revision DEPS variable when
17 # `gclient runhooks` is run as well.
18 llvm_force_head_revision = false
20 # Cronet is shipped in AOSP, where it is built using the Android Mainline
21 # Clang. Please refer to go/cronet-builders-with-mainline-clang-design for
23 # If this arg is set to true, we use the Android Mainline LLVM.
24 llvm_android_mainline = false
26 # Used for binary size analysis.
27 generate_linker_map = is_android && is_official_build
29 # Whether this toolchain is to be used for building host tools that are
30 # consumed during the build process. That includes proc macros and Cargo build
32 toolchain_for_rust_host_build_tools = false
35 if (generate_linker_map) {
36 assert(is_official_build || is_castos || is_cast_android,
37 "Linker map files should only be generated when is_official_build = " +
38 "true or is_castos = true or is_cast_android = true")
39 assert(current_os == "android" || current_os == "linux" ||
40 target_os == "android" || target_os == "linux" ||
41 target_os == "chromeos",
42 "Linker map files should only be generated for Android, Linux, " +
47 if (llvm_android_mainline) { # https://crbug.com/1481060
54 # Extension for shared library files (including leading dot).
56 shlib_extension = ".dylib"
57 } else if (is_android && is_component_build) {
58 # By appending .cr, we prevent name collisions with libraries already
59 # loaded by the Android zygote.
60 shlib_extension = ".cr.so"
61 } else if (is_posix || is_fuchsia) {
62 shlib_extension = ".so"
64 shlib_extension = ".dll"
66 assert(false, "Platform not supported")
69 # Same extension but for the host platform. We have significantly fewer host
71 if (host_os == "mac") {
72 host_shlib_extension = ".dylib"
73 } else if (host_os == "win") {
74 host_shlib_extension = ".dll"
75 } else if (host_os == "linux" || host_os == "aix") {
76 host_shlib_extension = ".so"
78 assert(false, "Host platform not supported")
81 # Prefix for shared library files.
82 if (is_posix || is_fuchsia) {
88 # Directory for shared library files.
95 # While other "tool"s in a toolchain are specific to the target of that
96 # toolchain, the "stamp" and "copy" tools are really generic to the host;
97 # but each toolchain must define them separately. GN doesn't allow a
98 # template instantiation inside a toolchain definition, so some boilerplate
99 # has to be repeated in each toolchain to define these two tools. These
100 # four variables reduce the duplication in that boilerplate.
101 stamp_description = "STAMP {{output}}"
102 copy_description = "COPY {{source}} {{output}}"
103 if (host_os == "win") {
105 rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir)
107 stamp_command = "cmd /c type nul > \"{{output}}\""
108 copy_command = "\"$python_path\" $_tool_wrapper_path recursive-mirror {{source}} {{output}}"
110 stamp_command = "touch {{output}}"
111 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
114 # This variable is true if the current toolchain is one of the target
115 # toolchains, i.e. a toolchain which is being used to build the main Chrome
116 # binary. This generally means "not the host toolchain", but in the case where
117 # we're targeting the host it's true then as well. We do require current_os to
118 # match target_os so that for example we avoid considering Android as a target
119 # toolchain when targeting CrOS.
120 is_a_target_toolchain =
121 (current_toolchain != host_toolchain ||
122 default_toolchain == host_toolchain) && current_os == target_os