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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/compiler/compiler.gni") | 7 import("//build/config/compiler/compiler.gni") |
8 import("//build/config/nacl/config.gni") | 8 import("//build/config/nacl/config.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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464 # flags for specific features. | 464 # flags for specific features. |
465 if (!is_debug && (allow_posix_link_time_opt || is_cfi) && !is_nacl) { | 465 if (!is_debug && (allow_posix_link_time_opt || is_cfi) && !is_nacl) { |
466 if (use_thin_lto) { | 466 if (use_thin_lto) { |
467 cflags += [ "-flto=thin" ] | 467 cflags += [ "-flto=thin" ] |
468 ldflags += [ "-flto=thin" ] | 468 ldflags += [ "-flto=thin" ] |
469 | 469 |
470 # Limit the parallelism to avoid too agressive competition between | 470 # Limit the parallelism to avoid too agressive competition between |
471 # linker jobs. This is still suboptimal to a potential dynamic | 471 # linker jobs. This is still suboptimal to a potential dynamic |
472 # resource allocation scheme, but should be good enough. | 472 # resource allocation scheme, but should be good enough. |
473 if (use_lld) { | 473 if (use_lld) { |
474 ldflags += [ "-Wl,--thinlto-jobs=8" ] | 474 ldflags += [ |
| 475 "-Wl,--thinlto-jobs=8", |
| 476 "-Wl,--thinlto-cache-dir=" + |
| 477 rebase_path("$root_out_dir/thinlto-cache", root_build_dir), |
| 478 ] |
475 } else { | 479 } else { |
476 ldflags += [ "-Wl,-plugin-opt,jobs=8" ] | 480 ldflags += [ "-Wl,-plugin-opt,jobs=8" ] |
477 } | 481 } |
478 } else { | 482 } else { |
479 # Note: ThinLTO does not currently have this feature implemented | 483 # Note: ThinLTO does not currently have this feature implemented |
480 # For Full LTO, it provides a measurable runtime speedup of Chrome. | 484 # For Full LTO, it provides a measurable runtime speedup of Chrome. |
481 cflags += [ | 485 cflags += [ |
482 "-flto", | 486 "-flto", |
483 "-fwhole-program-vtables", | 487 "-fwhole-program-vtables", |
484 ] | 488 ] |
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1703 | 1707 |
1704 if (is_ios || is_mac) { | 1708 if (is_ios || is_mac) { |
1705 # On Mac and iOS, this enables support for ARC (automatic ref-counting). | 1709 # On Mac and iOS, this enables support for ARC (automatic ref-counting). |
1706 # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html. | 1710 # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html. |
1707 config("enable_arc") { | 1711 config("enable_arc") { |
1708 common_flags = [ "-fobjc-arc" ] | 1712 common_flags = [ "-fobjc-arc" ] |
1709 cflags_objc = common_flags | 1713 cflags_objc = common_flags |
1710 cflags_objcc = common_flags | 1714 cflags_objcc = common_flags |
1711 } | 1715 } |
1712 } | 1716 } |
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