LLVM_LTO support for make / ninja

LLVM_LTO support for make / ninja

BUG=471146
R=pcc@chromium.org

Committed: https://chromium.googlesource.com/external/gyp/+/69dfb493a22f2489a226924425ba0d72eed3f439

[pcc, 2015-03-31 00:46:37]

Any plans to submit this? I'm working on a patch to add some LTO-related flags
for Mac and I guess I need this. For now I've just been using OTHER_CFLAGS=-flto
but I guess that doesn't tick the right box in Xcode.

[Nico, 2015-04-01 23:32:55]

thakis@chromium.org changed reviewers:
+ pcc@chromium.org

[Nico, 2015-04-01 23:32:55]

Sure, let's land this. I added a test. Looks like the code was already correct.
Wanna take a look?

[Nico, 2015-04-01 23:42:19]

I'm out until monday. If you like this, feel free to cq+ and then roll gyp in
chromium.

[pcc1, 2015-04-01 23:45:56]

On 2015/04/01 23:42:19, Nico (again away until Monday) wrote:
> I'm out until monday. If you like this, feel free to cq+ and then roll gyp in
> chromium.

LGTM

[pcc1, 2015-04-01 23:46:03]

The CQ bit was checked by pcc@chromium.org

[commit-bot: I haz the power, 2015-04-01 23:47:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-01 23:47:16]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[Nico, 2015-04-01 23:49:52]

Committed patchset #2 (id:20001) manually as
69dfb493a22f2489a226924425ba0d72eed3f439.

[scottmg, 2015-04-01 23:50:20]

scottmg@chromium.org changed reviewers:
+ scottmg@chromium.org

[scottmg, 2015-04-01 23:50:21]

is there an lto/test.gyp missing?

https://codereview.chromium.org/1003273007/diff/20001/pylib/gyp/xcode_emulati...
File pylib/gyp/xcode_emulation.py (right):

https://codereview.chromium.org/1003273007/diff/20001/pylib/gyp/xcode_emulati...
pylib/gyp/xcode_emulation.py:534: 
nit; extra \n

https://codereview.chromium.org/1003273007/diff/20001/test/mac/gyptest-lto.py
File test/mac/gyptest-lto.py (right):

https://codereview.chromium.org/1003273007/diff/20001/test/mac/gyptest-lto.py...
test/mac/gyptest-lto.py:20: #if test.format == 'xcode-ninja':
delete?

[Nico, 2015-04-01 23:52:39]

too late!

addressing that at https://codereview.chromium.org/1057723002/

(already did the newline in the last commit)