MIPS32EL: Add clang compiler flags for MIPS32 - Android

MIPS32EL: Add clang compiler flags for MIPS32 - Android

This adds compiler flags to enable Chromium Android
for mips32 to be compiled using clang.
GCC remains the default compiler.

BUG=
TEST=Manually:
export GYP_DEFINES="OS=android target_arch=mipsel clang=1"
./build/gyp_chromium
ninja -C out/Release

Committed: https://crrev.com/549e89dae53fba944de71ee0864d83520c6f5ecc
Cr-Commit-Position: refs/heads/master@{#322564}

[gordanac, 2015-03-18 13:05:11]

gordana.cmiljanovic@imgtec.com changed reviewers:
+ thakis@chromium.org

[gordanac, 2015-03-18 13:08:01]

gordana.cmiljanovic@imgtec.com changed reviewers:
+ cjhopman@chromium.org

[gordanac, 2015-03-18 13:08:01]

Please take a look.

[cjhopman, 2015-03-26 21:25:41]

lgtm

[gordanac, 2015-03-27 10:58:14]

The CQ bit was checked by gordana.cmiljanovic@imgtec.com

[commit-bot: I haz the power, 2015-03-27 10:58:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1009103003/1

[commit-bot: I haz the power, 2015-03-27 12:46:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 12:47:42]

Patchset 1 (id:??) landed as
https://crrev.com/549e89dae53fba944de71ee0864d83520c6f5ecc
Cr-Commit-Position: refs/heads/master@{#322564}

[Nico, 2015-11-30 18:47:47]

thakis@chromium.org changed reviewers:
+ gordana.cmiljanovic@imgtec.com
- Gordana.Cmiljanovic@imgtec.com

[Nico, 2015-11-30 18:47:47]

https://codereview.chromium.org/1009103003/diff/1/build/common.gypi
File build/common.gypi (right):

https://codereview.chromium.org/1009103003/diff/1/build/common.gypi#newcode4141
build/common.gypi:4141: '-no-integrated-as',
Everything builds fine for me with OS=android target_arch=mipsel even if I
remove this flag. Did you need it locally, or is this here just because the arm
block had it?

[Nico, 2015-11-30 20:01:30]

On 2015/11/30 18:47:47, Nico wrote:
> https://codereview.chromium.org/1009103003/diff/1/build/common.gypi
> File build/common.gypi (right):
> 
>
https://codereview.chromium.org/1009103003/diff/1/build/common.gypi#newcode4141
> build/common.gypi:4141: '-no-integrated-as',
> Everything builds fine for me with OS=android target_arch=mipsel even if I
> remove this flag. Did you need it locally, or is this here just because the
arm
> block had it?

Hm, actually some things are broken without this flag on mips. Nevermind.

[gordanac, 2015-12-04 18:36:11]

On 2015/11/30 20:01:30, Nico wrote:
> On 2015/11/30 18:47:47, Nico wrote:
> > https://codereview.chromium.org/1009103003/diff/1/build/common.gypi
> > File build/common.gypi (right):
> > 
> >
>
https://codereview.chromium.org/1009103003/diff/1/build/common.gypi#newcode4141
> > build/common.gypi:4141: '-no-integrated-as',
> > Everything builds fine for me with OS=android target_arch=mipsel even if I
> > remove this flag. Did you need it locally, or is this here just because the
> arm
> > block had it?
> 
> Hm, actually some things are broken without this flag on mips. Nevermind.


There is some mips inline asm code which clang cannot handle well.
(you need flags: OS=android target_arch=mipsel clang=1)

Actually, clang sets 'no-integrates-as' by default for MIPS, but it was added
here
to stress the need for it.

Please take a look into https://codereview.chromium.org/1503523002
which fix the current issue.