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1 # Copyright 2015 The Chromium Authors. All rights reserved. | 1 # Copyright 2015 The Chromium Authors. All rights reserved. |
2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
4 | 4 |
5 # Toolchain-related configuration that may be needed outside the context of the | 5 # Toolchain-related configuration that may be needed outside the context of the |
6 # toolchain() rules themselves. | 6 # toolchain() rules themselves. |
7 | 7 |
8 import("//build_overrides/build.gni") | 8 import("//build_overrides/build.gni") |
9 import("//build/config/chrome_build.gni") | 9 import("//build/config/chrome_build.gni") |
10 | 10 |
11 declare_args() { | 11 declare_args() { |
12 # Enable Link Time Optimization in optimized builds (output programs run | 12 # Enable Link Time Optimization in optimized builds (output programs run |
13 # faster, but linking is up to 5-20x slower). | 13 # faster, but linking is up to 5-20x slower). |
14 # Note: use target_os == "linux" rather than is_linux so that it does not | 14 # Note: use target_os == "linux" rather than is_linux so that it does not |
15 # apply to host_toolchain when target_os="android". | 15 # apply to host_toolchain when target_os="android". |
16 allow_posix_link_time_opt = | 16 allow_posix_link_time_opt = |
17 is_clang && target_os == "linux" && !is_chromeos && target_cpu == "x64" && | 17 is_clang && target_os == "linux" && !is_chromeos && target_cpu == "x64" && |
18 is_official_build | 18 is_official_build |
| 19 } |
19 | 20 |
20 # If used with allow_posix_link_time_opt, it enables the experimental support | 21 declare_args() { |
21 # of ThinLTO that links 3x-10x faster but (as of now) does not have all the | 22 # If used with allow_posix_link_time_opt, it enables support for ThinLTO, |
22 # important optimizations such us devirtualization implemented. See also | 23 # which links 3x-10x faster than full LTO. See also |
23 # http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html | 24 # http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html |
24 use_thin_lto = false | 25 use_thin_lto = allow_posix_link_time_opt && target_os == "linux" && |
| 26 !is_chromeos && target_cpu == "x64" |
25 | 27 |
26 # If this is set to true, or if LLVM_FORCE_HEAD_REVISION is set to 1 | 28 # If this is set to true, or if LLVM_FORCE_HEAD_REVISION is set to 1 |
27 # in the environment, we use the revision in the llvm repo to determine | 29 # in the environment, we use the revision in the llvm repo to determine |
28 # the CLANG_REVISION to use, instead of the version hard-coded into | 30 # the CLANG_REVISION to use, instead of the version hard-coded into |
29 # //tools/clang/scripts/update.py. This should only be used in | 31 # //tools/clang/scripts/update.py. This should only be used in |
30 # conjunction with setting LLVM_FORCE_HEAD_REVISION in the | 32 # conjunction with setting LLVM_FORCE_HEAD_REVISION in the |
31 # environment when `gclient runhooks` is run as well. | 33 # environment when `gclient runhooks` is run as well. |
32 llvm_force_head_revision = false | 34 llvm_force_head_revision = false |
33 | 35 |
34 # Compile with Xcode version of clang instead of hermetic version shipped | 36 # Compile with Xcode version of clang instead of hermetic version shipped |
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120 _tool_wrapper_path = | 122 _tool_wrapper_path = |
121 rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir) | 123 rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir) |
122 | 124 |
123 stamp_command = "$python_path $_tool_wrapper_path stamp {{output}}" | 125 stamp_command = "$python_path $_tool_wrapper_path stamp {{output}}" |
124 copy_command = | 126 copy_command = |
125 "$python_path $_tool_wrapper_path recursive-mirror {{source}} {{output}}" | 127 "$python_path $_tool_wrapper_path recursive-mirror {{source}} {{output}}" |
126 } else { | 128 } else { |
127 stamp_command = "touch {{output}}" | 129 stamp_command = "touch {{output}}" |
128 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}}
&& cp -af {{source}} {{output}})" | 130 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}}
&& cp -af {{source}} {{output}})" |
129 } | 131 } |
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