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1 # Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 # Copyright (c) 2013 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 import("//build/config/android/config.gni") | 5 import("//build/config/android/config.gni") |
6 import("//build/config/chrome_build.gni") | 6 import("//build/config/chrome_build.gni") |
7 import("//build/config/chromecast_build.gni") | 7 import("//build/config/chromecast_build.gni") |
8 import("//build/config/compiler/compiler.gni") | 8 import("//build/config/compiler/compiler.gni") |
9 import("//build/toolchain/cc_wrapper.gni") | 9 import("//build/toolchain/cc_wrapper.gni") |
10 import("//build/toolchain/toolchain.gni") | 10 import("//build/toolchain/toolchain.gni") |
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463 | 463 |
464 # Add flags for link-time optimization. These flags enable | 464 # Add flags for link-time optimization. These flags enable |
465 # optimizations/transformations that require whole-program visibility at link | 465 # optimizations/transformations that require whole-program visibility at link |
466 # time, so they need to be applied to all translation units, and we may end up | 466 # time, so they need to be applied to all translation units, and we may end up |
467 # with miscompiles if only part of the program is compiled with LTO flags. For | 467 # with miscompiles if only part of the program is compiled with LTO flags. For |
468 # that reason, we cannot allow targets to enable or disable these flags, for | 468 # that reason, we cannot allow targets to enable or disable these flags, for |
469 # example by disabling the optimize configuration. | 469 # example by disabling the optimize configuration. |
470 # TODO(pcc): Make this conditional on is_official_build rather than on gn | 470 # TODO(pcc): Make this conditional on is_official_build rather than on gn |
471 # flags for specific features. | 471 # flags for specific features. |
472 if (!is_debug && (allow_posix_link_time_opt || is_cfi) && !is_nacl) { | 472 if (!is_debug && (allow_posix_link_time_opt || is_cfi) && !is_nacl) { |
| 473 assert(use_lld || is_chromeos, "gold plugin only supported with ChromeOS") |
| 474 |
473 if (use_thin_lto) { | 475 if (use_thin_lto) { |
474 cflags += [ "-flto=thin" ] | 476 cflags += [ "-flto=thin" ] |
475 ldflags += [ "-flto=thin" ] | 477 ldflags += [ "-flto=thin" ] |
476 | 478 |
477 # Limit the parallelism to avoid too agressive competition between | 479 # Limit the parallelism to avoid too agressive competition between |
478 # linker jobs. This is still suboptimal to a potential dynamic | 480 # linker jobs. This is still suboptimal to a potential dynamic |
479 # resource allocation scheme, but should be good enough. | 481 # resource allocation scheme, but should be good enough. |
480 if (use_lld) { | 482 if (use_lld) { |
481 ldflags += [ | 483 ldflags += [ |
482 "-Wl,--thinlto-jobs=8", | 484 "-Wl,--thinlto-jobs=8", |
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1740 | 1742 |
1741 if (is_ios || is_mac) { | 1743 if (is_ios || is_mac) { |
1742 # On Mac and iOS, this enables support for ARC (automatic ref-counting). | 1744 # On Mac and iOS, this enables support for ARC (automatic ref-counting). |
1743 # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html. | 1745 # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html. |
1744 config("enable_arc") { | 1746 config("enable_arc") { |
1745 common_flags = [ "-fobjc-arc" ] | 1747 common_flags = [ "-fobjc-arc" ] |
1746 cflags_objc = common_flags | 1748 cflags_objc = common_flags |
1747 cflags_objcc = common_flags | 1749 cflags_objcc = common_flags |
1748 } | 1750 } |
1749 } | 1751 } |
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