newbie : For windows-target of PDO-DB-driver, CrossCompile or native-compile?

[Sanjeev Kumar <replyskumar@xxxxxxxxx>]

Hello,
I need to write PHP-PDO database-driver/extension for a new database.

The clarification I need:
1) Should I take the PHP-source on Windows-vista platform and build natively
the DLL for win.
   Will the VisualStudio9 compile with all PHP-main src & the extension
driver to generate the   target windows DLL (PDO extension).

or

2) should I take PHP-src on Linux platform and use GNU Cross-compiler to
generate DLL. Then transfer the DLL to the target-windowsVista PHP env.

 thanks,
-sanjeev kumar