Reland of Enable LTO on Linux for the official builds.

Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195, 615039
Committed: https://crrev.com/c8648b6aef59bf539251dc5242820a83b1a751f9
Cr-Commit-Position: refs/heads/master@{#396186}

[agrieve, 2016-05-26 15:33:51]

Created Reland of Enable LTO on Linux for the official builds.

[agrieve, 2016-05-26 15:38:33]

Description was changed from

==========
Reland of Enable LTO on Linux for the official builds. (patchset #1 id:1 of
https://codereview.chromium.org/2015703004/ )

Reason for revert:
Will re-land with Nico's suggested fix.

Original issue's description:
> Revert of Enable LTO on Linux for the official builds. (patchset #1 id:1 of
https://codereview.chromium.org/2003733004/ )
> 
> Reason for revert:
> Breaks android x64 builds.
> https://bugs.chromium.org/p/chromium/issues/detail?id=615039
> 
> Original issue's description:
> > Enable LTO on Linux for the official builds.
> >
> > This CL turns on Link-Time Optimization for official
> > builds, which makes the resulting binaries to run faster.
> >
> > On the dark side, the change increases the link time by 3x-5x,
> > and is also very memory-hungry. All official bots were
> > upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
> > were also accordingly increased.
> >
> > This CL might cause timeouts / OOMs, if some slaves still
> > have not enough RAM. Please, revert the CL with pointing
> > out to the slaves / bots broken by this change.
> >
> > BUG=453195
> >
> > Committed: https://crrev.com/7c163521444b7277f2c33bc7bc05667673db7d48
> > Cr-Commit-Position: refs/heads/master@{#395365}
> 
> TBR=dpranke@chromium.org,thestig@chromium.org,krasin@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=453195,615039
> 
> Committed: https://crrev.com/3ec265f1c1a76a6f5dfee6d860cf1a4b6e9ba79a
> Cr-Commit-Position: refs/heads/master@{#396175}

TBR=dpranke@chromium.org,thestig@chromium.org,krasin@google.com,thakis@chromi...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=453195,615039
==========

to

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

BUG=453195,615039
==========

[agrieve, 2016-05-26 15:39:06]

Description was changed from

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

BUG=453195,615039
==========

to

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195,615039
==========

[krasin, 2016-05-26 15:39:23]

LGTM

[agrieve, 2016-05-26 15:40:05]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2016-05-26 15:40:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2017633002/50001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2017633002/50001

[commit-bot: I haz the power, 2016-05-26 15:44:11]

Description was changed from

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195,615039
==========

to

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195,615039
==========

[commit-bot: I haz the power, 2016-05-26 15:44:12]

Committed patchset #2 (id:50001)

[commit-bot: I haz the power, 2016-05-26 15:46:53]

Description was changed from

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195,615039
==========

to

==========
Reland of Enable LTO on Linux for the official builds.

Reason for reland:
Uses target_os rather than is_linux

This CL turns on Link-Time Optimization for official
builds, which makes the resulting binaries to run faster.

On the dark side, the change increases the link time by 3x-5x,
and is also very memory-hungry. All official bots were
upgraded to have 200+ GB RAM to handle LTO builds. Timeouts
were also accordingly increased.

This CL might cause timeouts / OOMs, if some slaves still
have not enough RAM. Please, revert the CL with pointing
out to the slaves / bots broken by this change.

NOTRY=true
TBR=thakis
BUG=453195,615039

Committed: https://crrev.com/c8648b6aef59bf539251dc5242820a83b1a751f9
Cr-Commit-Position: refs/heads/master@{#396186}
==========

[commit-bot: I haz the power, 2016-05-26 15:46:54]

Patchset 2 (id:??) landed as
https://crrev.com/c8648b6aef59bf539251dc5242820a83b1a751f9
Cr-Commit-Position: refs/heads/master@{#396186}

[Dirk Pranke, 2016-05-26 18:26:29]

lgtm. Good catch; I didn't think about this triggering for the host toolchains.

https://codereview.chromium.org/2017633002/diff/50001/build/toolchain/toolcha...
File build/toolchain/toolchain.gni (right):

https://codereview.chromium.org/2017633002/diff/50001/build/toolchain/toolcha...
build/toolchain/toolchain.gni:17: is_chrome_branded && is_official_build
nit: is_chromeos will never be true of target_os == "linux", so you don't need
that clause.