linux: ignore warnings about unused results in third-party code

linux: ignore warnings about unused results in third-party code

This warning is frequent in our build logs across multiple third-party
modules.  It seems clear to me that upstreams don't see it
in their builds.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=94185

[Evan Martin, 2011-07-26 21:42:58]

Sending to some random people who may have some insight

[Evan Martin, 2011-07-26 21:43:23]

On 2011/07/26 21:42:58, Evan Martin wrote:
> Sending to some random people who may have some insight

PS search for "warn_unused" on e.g.
http://build.chromium.org/p/chromium/builders/Linux/builds/9995/steps/compile...

[Evan Martin, 2011-07-26 21:44:19]

+sfntly guy who I just also mailed about this warning

[Nico, 2011-07-26 21:46:48]

lgtm

sfntly probably wants to set chromium_code in their gyp file to get strict
warnings. Once it does this, it won't affected by this CL.

http://codereview.chromium.org/7465052/diff/1/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/7465052/diff/1/build/common.gypi#newcode917
build/common.gypi:917: 'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
Add here as well (in a 'WARNING_CFLAGS' block without the !)

[Evan Martin, 2011-07-26 21:54:07]

http://codereview.chromium.org/7465052/diff/1/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/7465052/diff/1/build/common.gypi#newcode917
build/common.gypi:917: 'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
On 2011/07/26 21:46:48, Nico wrote:
> Add here as well (in a 'WARNING_CFLAGS' block without the !)

I don't see this warning in the mac build logs.  Maybe it's from a different
version of gcc?

[Ami GONE FROM CHROMIUM, 2011-07-26 21:59:37]

lgtm

http://codereview.chromium.org/7465052/diff/1/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/7465052/diff/1/build/common.gypi#newcode917
build/common.gypi:917: 'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
On 2011/07/26 21:54:07, Evan Martin wrote:
> On 2011/07/26 21:46:48, Nico wrote:
> > Add here as well (in a 'WARNING_CFLAGS' block without the !)
> 
> I don't see this warning in the mac build logs.  Maybe it's from a different
> version of gcc?

mac builders use gcc 4.2?

[Nico, 2011-07-26 22:04:43]

http://codereview.chromium.org/7465052/diff/1/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/7465052/diff/1/build/common.gypi#newcode917
build/common.gypi:917: 'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
On 2011/07/26 21:54:07, Evan Martin wrote:
> On 2011/07/26 21:46:48, Nico wrote:
> > Add here as well (in a 'WARNING_CFLAGS' block without the !)
> 
> I don't see this warning in the mac build logs.  Maybe it's from a different
> version of gcc?

I tried to look on the clang bots but couldn't find a recent clobber build.

Ok.