Need reviewer: Fix for windows cygwin issues

[Igor Nekrestyanov]

  Change itself seems ok to me.

In longer term we should add some "caching" support for fullpath/etc 
macros, so we do not evaluate those every time
make cd to new directory ...

In deployment makefiles we populate file with resolved variables once 
(to be used with ant, not to solve cygwin problem)
and then include it every time we need them.

FWIW, we use simple rules to update the file:
   0) file is generated no more than once per make run
   1) file does not exist => generate it
   2) file exist but make is run from top level => wipe it and regenerate
   3) file exist but explicit force parameter is passed => wipe and 
regenerate
   4) otherwise use existing file ...
The motivation behind it is that config is changed rarely for partial 
builds and if we need to compile 1 file than waiting 30s for
makefiles to be loaded is too much.

Would be great if we can do something like this for full build ...

-igor

On 2/10/11 1:45 PM, Kelly O'Hair wrote:
> Need reviewer
>
> 7012644: Regression: jdk/make/common/shared/Defs-windows.gmk has 
> problems on cygwin
> http://cr.openjdk.java.net/~ohair/openjdk7/jdk7-tl-cygwin/webrev/
>
> I'm still testing builds on all platforms to make sure this is all ok.
>
> I will push this to both the jdk7/build/jdk and jdk7/tl/jdk repository 
> once it's reviewed and I'm
> sure it doesn't cause any regressions to the build for RE.
>
> -kto
>