From: Ilya Shipitsin <chipitsine@...277...>
Date: Sun,  9 Jul 2017 19:46:46 +0500
Message-Id: <20170709144646.10352-1-chipitsine@...277...>
Subject: [Openvpn-devel] [PATCH] win32 build: check for ENETUNREACH
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Currently, we do not check for mingw-gcc version. For example,
Debian 7 is shipped with 4.6.3, which does not know about ENETUNREACH
---

this is for 2.4 and HEAD branches

 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/configure.ac b/configure.ac
index 60bb465..80b26ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -708,6 +708,20 @@ m4_define(
 	[setsockopt getsockopt getsockname poll]dnl
 )
 if test "${WIN32}" = "yes"; then
+
+#
+# check for ENETUNREACH 
+# at least Debian 7 is shipped with gcc-mingw-w64-4.6.3, which is too old
+#
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[#include <errno.h>
+#if !defined (ENETUNREACH)
+# error ENETUNREACH not defined
+#endif
+]])],
+                   ,
+                   [AC_MSG_ERROR([gcc-mingw is too old, please update])])
+
 # normal autoconf function checking does not find inet_ntop/inet_pton
 # because they need to include the actual header file and link ws2_32.dll
 	LIBS="${LIBS} -lws2_32"
-- 
2.9.4