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Issue 891028 link

Starred by 1 user
Status: Fixed
Owner:
█ mka@chromium.org
Last visit > 30 days ago
Closed: Nov 1
Cc:
groeck@chromium.org
manojgupta@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 2
Type: Bug



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Build Chrome OS v4.19 kernel with clang

Project Member Reported by mka@chromium.org, Oct 1 
v4.19 will be the next LTS kernel version, groeck@ started preparing the rebase of v4.14.

clang is used as compiler for newer Chrome OS kernels (>= v4.4). No major developments should be needed to build v4.19 for x86 and arm64 with clang , however some adaptation is still required, especially since x86 maintainers enforced the use of 'asm goto', which isn't supported by clang yet.

This bug is used to keep track of the changes needed to build CrOS v4.19 with clang.
Project Member

Comment 1 by bugdroid1@chromium.org, Oct 26 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/e423efc9470316ec38e06ba6599535a04bbddb51

commit e423efc9470316ec38e06ba6599535a04bbddb51
Author: Matthias Kaehlcke <mka@chromium.org>
Date: Fri Oct 26 19:14:53 2018

Keep building custom kernels with gcc

CL:1294370 makes clang the default kernel compiler. Some platforms
(acorn, beaglebone, raspberrypi and reptile) use custom kernels without
clang support. Keep using gcc for kernel builds for these targets.

BUG= chromium:891028 
TEST=pre-cq passes

Change-Id: Iaa2940714a70766c8d824a22d6290aeff6cddbcb
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1299574
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/e423efc9470316ec38e06ba6599535a04bbddb51/overlay-beaglebone/profiles/base/package.use
[add] https://crrev.com/e423efc9470316ec38e06ba6599535a04bbddb51/overlay-acorn/profiles/base/package.use
[modify] https://crrev.com/e423efc9470316ec38e06ba6599535a04bbddb51/overlay-raspberrypi/profiles/base/package.use
[modify] https://crrev.com/e423efc9470316ec38e06ba6599535a04bbddb51/overlay-reptile/profiles/base/package.use
Project Member

Comment 2 by bugdroid1@chromium.org, Oct 27 

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chromeos/overlays/overlay-loonix-private/+/96dcf5b9c18f7bdf63f0027f7321e44e456ef5a9

commit 96dcf5b9c18f7bdf63f0027f7321e44e456ef5a9
Author: Matthias Kaehlcke <mka@chromium.org>
Date: Sat Oct 27 00:19:05 2018
Project Member

Comment 3 by bugdroid1@chromium.org, Oct 30 

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/chromeos/overlays/overlay-loonix-private/+/76c762145a88017c29e3f65f30c8d0c4b72cff05

commit 76c762145a88017c29e3f65f30c8d0c4b72cff05
Author: Matthias Kaehlcke <mka@chromium.org>
Date: Tue Oct 30 04:18:20 2018
Project Member

Comment 4 by bugdroid1@chromium.org, Nov 1 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/9ded75331ed0b7a6f00006d4ffd96ac5210d0976

commit 9ded75331ed0b7a6f00006d4ffd96ac5210d0976
Author: Matthias Kaehlcke <mka@chromium.org>
Date: Thu Nov 01 00:38:21 2018

cros-kernel2: Make clang the default compiler for kernel builds

clang is the CrOS default compiler for current and future kernels,
reflect this in the .eclass. Only kernels >= v4.4 have support for
being built with clang, hence build older kernels with gcc.

BUG= chromium:891028 ,chromium:897984
TEST=kernels >= v4.4 are built with clang, older ones with gcc
CQ-DEPEND=CL:1307996

Change-Id: I6cc9a22eed8d7617fe2495beea0451c80b24580c
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1294370
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/9ded75331ed0b7a6f00006d4ffd96ac5210d0976/eclass/cros-kernel2.eclass
[modify] https://crrev.com/9ded75331ed0b7a6f00006d4ffd96ac5210d0976/profiles/targets/chromeos/package.use

Comment 5 by mka@chromium.org, Nov 1

Status: Fixed (was: Assigned)
►

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