[gn] Fix sysroot usage with gcc

[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true

Committed: https://crrev.com/207fd4b9cd741728cfd2ebe77d1ffe232f921965
Cr-Commit-Position: refs/heads/master@{#37575}

[Michael Achenbach, 2016-07-07 09:19:49]

Description was changed from

==========
[gn] Fix sysroot usage with gcc

BUG=
==========

to

==========
[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true
==========

[Michael Achenbach, 2016-07-07 09:19:49]

machenbach@chromium.org changed reviewers:
+ jochen@chromium.org, vogelheim@chromium.org

[Michael Achenbach, 2016-07-07 09:21:06]

PTAL. Looks like gcc and sysroot don't work together in gn either. We didn't
support it with gyp, but here we have to explicitly switch off sysroot usage.
See error:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20gcc%204.8/builds...

[Michael Achenbach, 2016-07-07 09:23:52]

Works with the trybot now:
https://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/b...

[Michael Achenbach, 2016-07-07 09:24:10]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2016-07-07 09:24:16]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-07 09:26:14]

Description was changed from

==========
[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true
==========

to

==========
[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true
==========

[commit-bot: I haz the power, 2016-07-07 09:26:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-07 09:27:56]

Description was changed from

==========
[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true
==========

to

==========
[gn] Fix sysroot usage with gcc

BUG=chromium:474921
TBR=jochen@chromium.org, vogelheim@chromium.org,
NOTRY=true

Committed: https://crrev.com/207fd4b9cd741728cfd2ebe77d1ffe232f921965
Cr-Commit-Position: refs/heads/master@{#37575}
==========

[commit-bot: I haz the power, 2016-07-07 09:27:57]

Patchset 1 (id:??) landed as
https://crrev.com/207fd4b9cd741728cfd2ebe77d1ffe232f921965
Cr-Commit-Position: refs/heads/master@{#37575}

[vogelheim, 2016-07-07 10:58:32]

lgtm