Only build against prebuilt sysroot when using clang

Only build against prebuilt sysroot when using clang

Its is not currently possible to use gcc with the sysroot
since the sysroot only contains C++ headers for gcc 4.6
and gcc 4.8 is required to build chromium.  Luckily clang
is more flexible and able to detect and work with the 4.6
headers in the sysroot.

BUG=504446
Committed: https://crrev.com/ccc8c1e14c155255a8ef844704d97fa8e7d0dac2
Cr-Commit-Position: refs/heads/master@{#361905}

[Sam Clegg, 2015-11-25 19:46:43]

sbc@chromium.org changed reviewers:
+ dpranke@chromium.org

[Sam Clegg, 2015-11-25 20:28:09]

The CQ bit was checked by sbc@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-25 20:29:07]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1476923005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1476923005/20001

[Dirk Pranke, 2015-11-25 20:32:39]

lgtm

[commit-bot: I haz the power, 2015-11-25 20:38:28]

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

[commit-bot: I haz the power, 2015-11-25 20:38:28]

Dry run: Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Sam Clegg, 2015-11-25 21:37:24]

The CQ bit was checked by sbc@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-25 21:40:52]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1476923005/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1476923005/40001

[commit-bot: I haz the power, 2015-11-25 23:47:04]

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

[commit-bot: I haz the power, 2015-11-25 23:47:04]

Dry run: Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)

[Sam Clegg, 2015-11-26 16:36:20]

The CQ bit was checked by sbc@chromium.org

[Sam Clegg, 2015-11-26 16:36:21]

The patchset sent to the CQ was uploaded after l-g-t-m from dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/1476923005/#ps40001
(title: " ")

[commit-bot: I haz the power, 2015-11-26 16:36:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1476923005/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1476923005/40001

[commit-bot: I haz the power, 2015-11-26 16:41:21]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-11-26 16:42:35]

Description was changed from

==========
Only build against prebuilt sysroot when using clang

Its is not currently possible to use gcc with the sysroot
since the sysroot only contains C++ headers for gcc 4.6
and gcc 4.8 is required to build chromium.  Luckily clang
is more flexible and able to detect and work with the 4.6
headers in the sysroot.

BUG=504446
==========

to

==========
Only build against prebuilt sysroot when using clang

Its is not currently possible to use gcc with the sysroot
since the sysroot only contains C++ headers for gcc 4.6
and gcc 4.8 is required to build chromium.  Luckily clang
is more flexible and able to detect and work with the 4.6
headers in the sysroot.

BUG=504446

Committed: https://crrev.com/ccc8c1e14c155255a8ef844704d97fa8e7d0dac2
Cr-Commit-Position: refs/heads/master@{#361905}
==========

[commit-bot: I haz the power, 2015-11-26 16:42:38]

Patchset 3 (id:??) landed as
https://crrev.com/ccc8c1e14c155255a8ef844704d97fa8e7d0dac2
Cr-Commit-Position: refs/heads/master@{#361905}

[brucedawson, 2015-11-26 19:26:03]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1483433002/ by brucedawson@chromium.org.

The reason for reverting is: Speculative revert to fix:

FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash
../out/Release/installer/debian/build.sh -o../out/Release -b ../out/Release -a
ia32 -d google_chrome -c beta
dpkg-shlibdeps: warning: binaries to analyze should already be installed in
their package's directory.
4c4
< libc6 (>= 2.11)
---
> libc6 (>= 2.15)

https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Linux....