clang: Make it possible to add a plugin through GYP_DEFINES

clang: Make it possible to add a plugin through GYP_DEFINES

With this CL, one can run

    GYP_DEFINES='clang=1 clang_load=/Users/thakis/src/llvm-svn/tools/clang/examples/PrintFunctionNames/libPrintFunctionNames.dylib clang_plugin=print-fns' gclient runhooks

and then the normal build will run with the clang example plugin.

I'm not sure if this is the best way to run Elliot's plugin, but it's useful for local one-off runs.

BUG=none
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=72924

[Evan Martin, 2011-01-28 01:04:36]

LGTM, maybe elliot has opinions

http://codereview.chromium.org/6355010/diff/7001/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/6355010/diff/7001/build/common.gypi#newcode273
build/common.gypi:273: 'clang_load%': '',
Can you add docs to these?

[Elliot Glaysher, 2011-01-28 01:11:20]

My opinion is that this should be committed immediately so I won't
need to locally patch this in every time I need to do something with
plugins. :)

On Thu, Jan 27, 2011 at 5:04 PM,  <evan@chromium.org> wrote:
> LGTM, maybe elliot has opinions
>
>
> http://codereview.chromium.org/6355010/diff/7001/build/common.gypi
> File build/common.gypi (right):
>
> http://codereview.chromium.org/6355010/diff/7001/build/common.gypi#newcode273
> build/common.gypi:273: 'clang_load%': '',
> Can you add docs to these?
>
> http://codereview.chromium.org/6355010/
>

[Nico, 2011-01-28 01:20:53]

added a comment