Add ability to specify arguments to default actions through environment variable

I was looking for the ability to do:

GYP_RUN_ARGS="--gtest_filter=MultiProcessLockTest.*" xcodebuild -target "Run unit_tests"

so that I wouldn't always be running all the tests. Thought this may be generally a useful feature.

[dmac, 2010-11-16 21:06:04]

Does this interest you at all?

[Mark Mentovai, 2010-11-16 21:37:08]

Yes, this is probably of enough general interest to take. The one thing that
concerns me is argument splitting. It seems that this only works with a single
argument.

[Mark Mentovai, 2010-11-16 21:38:25]

http://googletest.googlecode.com/svn/trunk/test/gtest_filter_unittest.py says
you can use the GTEST_FILTER environment variable. Does that work?

[dmaclach_google.com, 2010-11-16 21:46:29]

Probably will be just fine. Not as general as what I was planning, but
certainly covers my needs.

Cheers,
Dave

On Tue, Nov 16, 2010 at 1:38 PM,  <mark@chromium.org> wrote:
> http://googletest.googlecode.com/svn/trunk/test/gtest_filter_unittest.py
> says you can use the GTEST_FILTER environment variable. Does that work?
>
> http://codereview.appspot.com/3148041/
>

[Mark Mentovai, 2010-11-16 21:47:25]

I’m still open to what you were proposing if you’ve got a use case
that isn’t covered. But having a specific environment variable for the
task you’re interested in certainly gets us past the “how do you do
more than one argument?” question.