Very preliminary work for ninja on Windows

Very preliminary work for ninja on Windows.

Only trying to get a first test passing: 

gyptest.py test/hello/gyptest-all.py -f ninja

builds obj, links, and runs, but fails the up_to_date test because there's no .d handling yet. (Is the deplist branch of ninja the best starting point for that?)
Committed: https://code.google.com/p/gyp/source/detail?r=1200

[scottmg, 2012-02-14 18:58:47]

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
File pylib/gyp/generator/ninja.py (right):

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
pylib/gyp/generator/ninja.py:88: depth = len(path.split(os.path.sep))
This was *sneaky*! Paths were ../blah instead of ../../blah, but not very
obvious. :)

[Evan Martin, 2012-02-14 19:07:28]

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
File pylib/gyp/generator/ninja.py (right):

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
pylib/gyp/generator/ninja.py:46: # these back in later?
See make.py:

def CalculateVariables(default_variables, params):
  """Calculate additional variables for use in the build (called by gyp)."""

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
pylib/gyp/generator/ninja.py:88: depth = len(path.split(os.path.sep))
On 2012/02/14 18:58:48, scottmg wrote:
> This was *sneaky*! Paths were ../blah instead of ../../blah, but not very
> obvious. :)

Is there value in allowing us to generate files across platforms?  I guess we
can deal with that when we come to it.

[Nico, 2012-02-14 19:14:10]

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
File pylib/gyp/generator/ninja.py (right):

https://chromiumcodereview.appspot.com/9358067/diff/1/pylib/gyp/generator/nin...
pylib/gyp/generator/ninja.py:46: # these back in later?
On 2012/02/14 19:07:29, Evan Martin wrote:
> See make.py:
> 
> def CalculateVariables(default_variables, params):
>   """Calculate additional variables for use in the build (called by gyp)."""

See also the same function in ninja.py :-)

[scottmg, 2012-02-14 19:24:19]

On 2012/02/14 19:07:28, Evan Martin wrote:

> Is there value in allowing us to generate files across platforms?  I guess we
> can deal with that when we come to it.

Do you mean generate on posix to a Win FS and build there? Doesn't seem that
useful to me. Cross-compile of course would be useful though.

Anyway, yeah, I guess we can fix that sort of thing later if we want to.

[scottmg, 2012-02-14 19:24:42]

On 2012/02/14 19:14:10, Nico wrote:
> On 2012/02/14 19:07:29, Evan Martin wrote:
> > 
> > def CalculateVariables(default_variables, params):
> 
> See also the same function in ninja.py :-)

Oops, thanks. Fixed.

[Evan Martin, 2012-02-14 19:28:51]

LGTM