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Date: Fri, 22 May 2015 19:37:04 +0900
From: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To: cygwin AT cygwin DOT com
Subject: Re: cannot build cygwin-2.0.2 because of net.cc (or because of some header.h)
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References: <B8FA2086-BAFE-4B3E-9D52-2BE106CB9360 AT Denis-Excoffier DOT org>	<20150521201509 DOT 9b9bfcffb07b3d9337de9e10 AT nifty DOT ne DOT jp>
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On Thu, 21 May 2015 20:15:09 +0900
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp> wrote:

> On Mon, 11 May 2015 17:52:04 +0200
> Denis Excoffier wrote:
> 
> > In order to successfully build cygwin-2.0.2-1 (for x86, both XP and W7) i had to apply
> > the following patch (below). No such problem with cygwin-2.0.1-1.
> 
> In my case, the same problem is caused by upgrading
> w32api-headers to 4.0.2-1. It does not result from
> difference between cygwin-2.0.2-1 and cygwin-2.0.1-1.

I have looked into this problem. The cause is as follows.

netioapi.h in w32api-headers 3.3.0-2 was using a macro-name
_INC_NETIOAPI for include-guard. By defining _INC_NETIOAPI,
net.cc avoids including netioapi.h, which conflicts with
if_nametoindex() and if_indextoname() in it.

However, the macro-name for include-guard in netioapi.h of
w32api-headers 4.0.2-1 has been changed to _NETIOAPI_H_.

As a result, net.cc fails to avoid including netioapi.h,
which causes confliction.

Thus, defining _NETIOAPI_H_ in net.cc resolves the problem.


diff --git a/winsup/cygwin/net.cc b/winsup/cygwin/net.cc
index eaf6eb8..d6a631b 100644
--- a/winsup/cygwin/net.cc
+++ b/winsup/cygwin/net.cc
@@ -19,6 +19,7 @@ details. */
    TODO:  Convert if_nametoindex to cygwin_if_nametoindex and call
 	  system functions on Vista and later. */
 #define _INC_NETIOAPI
+#define _NETIOAPI_H_
 #include "winsup.h"
 #ifdef __x86_64__
 /* 2014-04-24: Current Mingw headers define sockaddr_in6 using u_long (8 byte)


-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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