Description:
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I've noticed that theres really many repeated compiler warnings especially on Windows, so here goes:


Zend Engine:
HEAD: http://phpfi.com/360836
PHP_5_3: http://phpfi.com/360837

PHP:
In both HEAD and PHP_5_3 theres a repeated compiler warning C4142 (benign redefinition of type):
C:\Program Files\Microsoft SDKs\Windows\v6.0A\include\Ws2tcpip.h(502) : warning C4142: benign redefinition of type

I looked at Ws2tcpip.h, and it seems to be redefining socklen_t which is in the Windows SDK, its only defined if _WIN32_WINNT is >= 6, so it must be included before the generated config file (main/config.w32.h) where _WIN32_WINNT is defined to 5. Also main/php.h seems to be defining socklen_t ifndef HAVE_SOCKLEN_T, which im unsure if the Windows SDK has.


Note that these are not critical for actual running PHP, but it would be great to have a cleaner screen on compile ;)


Resources (MSDN on compiler warnings):
C4090: http://msdn.microsoft.com/en-us/library/k77bkb8d.aspx
C4101: http://msdn.microsoft.com/en-us/library/c733d5h9.aspx
C4142: http://msdn.microsoft.com/en-us/library/cbs8z6wh.aspx