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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/allocator.gni") | 5 import("//build/config/allocator.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/crypto.gni") | 8 import("//build/config/crypto.gni") |
9 import("//build/config/dcheck_always_on.gni") | 9 import("//build/config/dcheck_always_on.gni") |
10 import("//build/config/features.gni") | 10 import("//build/config/features.gni") |
| 11 import("//build/config/pch.gni") |
11 import("//build/config/sanitizers/sanitizers.gni") | 12 import("//build/config/sanitizers/sanitizers.gni") |
12 import("//build/config/ui.gni") | 13 import("//build/config/ui.gni") |
13 import("//build/toolchain/goma.gni") | 14 import("//build/toolchain/goma.gni") |
14 | 15 |
15 # One common error that happens is that GYP-generated headers within gen/ get | 16 # One common error that happens is that GYP-generated headers within gen/ get |
16 # included rather than the GN-generated ones within gen/ subdirectories. | 17 # included rather than the GN-generated ones within gen/ subdirectories. |
17 # TODO(GYP_GONE): Remove once GYP is gone (as well as exec_script exception). | 18 # TODO(GYP_GONE): Remove once GYP is gone (as well as exec_script exception). |
18 assert( | 19 assert( |
19 exec_script("//build/dir_exists.py", [ "obj.host" ], "string") == "False", | 20 exec_script("//build/dir_exists.py", [ "obj.host" ], "string") == "False", |
20 "GYP artifacts detected in $root_build_dir.$0x0A" + | 21 "GYP artifacts detected in $root_build_dir.$0x0A" + |
21 "You must wipe this directory before building with GN.") | 22 "You must wipe this directory before building with GN.") |
22 | 23 |
23 declare_args() { | 24 declare_args() { |
24 # When set (the default) enables C++ iterator debugging in debug builds. | 25 # When set (the default) enables C++ iterator debugging in debug builds. |
25 # Iterator debugging is always off in release builds (technically, this flag | 26 # Iterator debugging is always off in release builds (technically, this flag |
26 # affects the "debug" config, which is always available but applied by | 27 # affects the "debug" config, which is always available but applied by |
27 # default only in debug builds). | 28 # default only in debug builds). |
28 # | 29 # |
29 # Iterator debugging is generally useful for catching bugs. But it can | 30 # Iterator debugging is generally useful for catching bugs. But it can |
30 # introduce extra locking to check the state of an iterator against the state | 31 # introduce extra locking to check the state of an iterator against the state |
31 # of the current object. For iterator- and thread-heavy code, this can | 32 # of the current object. For iterator- and thread-heavy code, this can |
32 # significantly slow execution. | 33 # significantly slow execution. |
33 enable_iterator_debugging = true | 34 enable_iterator_debugging = true |
34 | |
35 # Normally we try to decide whether to use precompiled headers or | |
36 # not based on the other build arguments, but in some cases it is | |
37 # easiest to force them off explicitly. | |
38 disable_precompiled_headers = false | |
39 } | 35 } |
40 | 36 |
41 # ============================================== | 37 # ============================================== |
42 # PLEASE DO NOT ADD MORE THINGS TO THIS LIST | 38 # PLEASE DO NOT ADD MORE THINGS TO THIS LIST |
43 # ============================================== | 39 # ============================================== |
44 # | 40 # |
45 # Legacy feature defines applied to all targets. | 41 # Legacy feature defines applied to all targets. |
46 # | 42 # |
47 # These are applied to every single compile in the build and most of them are | 43 # These are applied to every single compile in the build and most of them are |
48 # only relevant to a few files. This bloats command lines and causes | 44 # only relevant to a few files. This bloats command lines and causes |
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381 | 377 |
382 # Add this config to your target to enable precompiled headers. | 378 # Add this config to your target to enable precompiled headers. |
383 # | 379 # |
384 # Precompiled headers are done on a per-target basis. If you have just a couple | 380 # Precompiled headers are done on a per-target basis. If you have just a couple |
385 # of files, the time it takes to precompile (~2 seconds) can actually be longer | 381 # of files, the time it takes to precompile (~2 seconds) can actually be longer |
386 # than the time saved. On a Z620, a 100 file target compiles about 2 seconds | 382 # than the time saved. On a Z620, a 100 file target compiles about 2 seconds |
387 # faster with precompiled headers, with greater savings for larger targets. | 383 # faster with precompiled headers, with greater savings for larger targets. |
388 # | 384 # |
389 # Recommend precompiled headers for targets with more than 50 .cc files. | 385 # Recommend precompiled headers for targets with more than 50 .cc files. |
390 config("precompiled_headers") { | 386 config("precompiled_headers") { |
391 if (!is_official_build && !use_goma && !disable_precompiled_headers) { | 387 if (!disable_precompiled_headers) { |
392 if (is_win) { | 388 if (is_win) { |
393 # This is a string rather than a file GN knows about. It has to match | 389 # This is a string rather than a file GN knows about. It has to match |
394 # exactly what's in the /FI flag below, and what might appear in the | 390 # exactly what's in the /FI flag below, and what might appear in the |
395 # source code in quotes for an #include directive. | 391 # source code in quotes for an #include directive. |
396 precompiled_header = "build/precompile.h" | 392 precompiled_header = "build/precompile.h" |
397 | 393 |
398 # This is a file that GN will compile with the above header. It will be | 394 # This is a file that GN will compile with the above header. It will be |
399 # implicitly added to the sources (potentially multiple times, with one | 395 # implicitly added to the sources (potentially multiple times, with one |
400 # variant for each language used in the target). | 396 # variant for each language used in the target). |
401 precompiled_source = "//build/precompile.cc" | 397 precompiled_source = "//build/precompile.cc" |
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412 # file doesn't exist, no error will be generated (probably MS tested this | 408 # file doesn't exist, no error will be generated (probably MS tested this |
413 # case but forgot the other one?). To reproduce this error, do a build, | 409 # case but forgot the other one?). To reproduce this error, do a build, |
414 # then delete the precompile.c.obj file, then build again. | 410 # then delete the precompile.c.obj file, then build again. |
415 cflags_c = [ "/wd4206" ] | 411 cflags_c = [ "/wd4206" ] |
416 } else if (is_mac) { | 412 } else if (is_mac) { |
417 precompiled_header = "build/precompile.h" | 413 precompiled_header = "build/precompile.h" |
418 precompiled_source = "//build/precompile.h" | 414 precompiled_source = "//build/precompile.h" |
419 } | 415 } |
420 } | 416 } |
421 } | 417 } |
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