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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 # Set to true to use lld, the LLVM linker. This flag may be used on Windows |
| 21 # with the shipped LLVM toolchain, or on Linux with a self-built top-of-tree |
| 22 # LLVM toolchain (see llvm_force_head_revision in |
| 23 # build/config/compiler/BUILD.gn). |
| 24 use_lld = is_win && host_os != "win" |
| 25 |
20 # If used with allow_posix_link_time_opt, it enables the experimental support | 26 # If used with allow_posix_link_time_opt, it enables the experimental support |
21 # of ThinLTO that links 3x-10x faster but (as of now) does not have all the | 27 # of ThinLTO that links 3x-10x faster but (as of now) does not have all the |
22 # important optimizations such us devirtualization implemented. See also | 28 # important optimizations such us devirtualization implemented. See also |
23 # http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html | 29 # http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html |
24 use_thin_lto = false | 30 use_thin_lto = false |
25 | 31 |
26 # If this is set to true, or if LLVM_FORCE_HEAD_REVISION is set to 1 | 32 # 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 | 33 # 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 | 34 # the CLANG_REVISION to use, instead of the version hard-coded into |
29 # //tools/clang/scripts/update.py. This should only be used in | 35 # //tools/clang/scripts/update.py. This should only be used in |
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40 # The path to the hermetic install of Xcode. Only relevant when | 46 # The path to the hermetic install of Xcode. Only relevant when |
41 # use_system_xcode = false. | 47 # use_system_xcode = false. |
42 hermetic_xcode_path = | 48 hermetic_xcode_path = |
43 rebase_path("//build/${target_os}_files/Xcode.app", "", root_build_dir) | 49 rebase_path("//build/${target_os}_files/Xcode.app", "", root_build_dir) |
44 | 50 |
45 declare_args() { | 51 declare_args() { |
46 if (is_clang) { | 52 if (is_clang) { |
47 # Clang compiler version. Clang files are placed at version-dependent paths. | 53 # Clang compiler version. Clang files are placed at version-dependent paths. |
48 clang_version = "5.0.0" | 54 clang_version = "5.0.0" |
49 } | 55 } |
50 | |
51 # Set to true to use lld, the LLVM linker. This flag may be used on Windows | |
52 # or Linux. | |
53 use_lld = (is_win && host_os != "win") || | |
54 (allow_posix_link_time_opt && target_os == "linux" && | |
55 !is_chromeos && target_cpu == "x64") | |
56 } | 56 } |
57 | 57 |
58 # Check target_os here instead of is_ios as this file is loaded for secondary | 58 # Check target_os here instead of is_ios as this file is loaded for secondary |
59 # toolchain (host toolchain in particular) but the argument is the same for | 59 # toolchain (host toolchain in particular) but the argument is the same for |
60 # all toolchains. | 60 # all toolchains. |
61 assert(!use_xcode_clang || target_os == "ios", | 61 assert(!use_xcode_clang || target_os == "ios", |
62 "Using Xcode's clang is only supported in iOS builds") | 62 "Using Xcode's clang is only supported in iOS builds") |
63 | 63 |
64 # Subdirectory within root_out_dir for shared library files. | 64 # Subdirectory within root_out_dir for shared library files. |
65 # TODO(agrieve): GYP sets this to "lib" for Linux & Android, but this won't work | 65 # TODO(agrieve): GYP sets this to "lib" for Linux & Android, but this won't work |
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107 _tool_wrapper_path = | 107 _tool_wrapper_path = |
108 rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir) | 108 rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir) |
109 | 109 |
110 stamp_command = "$python_path $_tool_wrapper_path stamp {{output}}" | 110 stamp_command = "$python_path $_tool_wrapper_path stamp {{output}}" |
111 copy_command = | 111 copy_command = |
112 "$python_path $_tool_wrapper_path recursive-mirror {{source}} {{output}}" | 112 "$python_path $_tool_wrapper_path recursive-mirror {{source}} {{output}}" |
113 } else { | 113 } else { |
114 stamp_command = "touch {{output}}" | 114 stamp_command = "touch {{output}}" |
115 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}}
&& cp -af {{source}} {{output}})" | 115 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}}
&& cp -af {{source}} {{output}})" |
116 } | 116 } |
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