From 387bdf2d8afb233b1a35d4b90686c49e2b269d29 Mon Sep 17 00:00:00 2001
From: Christian Babeux <christian.babeux@efficios.com>
Date: Thu, 29 Nov 2012 15:14:11 -0500
Subject: [PATCH] Force the ld "no-undefined" flag on Cygwin

In order to build shared libraries on Cygwin/MinGW/Windows, all
symbols must be defined at link time. Activating the "-no-undefined"
flag will fail the build if it's not the case.

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
---
 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index 2b6b68739..dc2af5829 100644
--- a/configure.ac
+++ b/configure.ac
@@ -187,6 +187,13 @@ AX_CONFIG_FEATURE(
 )
 AM_CONDITIONAL([COMPAT_EPOLL], [ test "$enable_epoll" = "yes" ])
 
+case "${host}" in
+    # All symbols must be resolved at link time on Cygwin/MinGW/Windows,
+    # else libtool will not be able to build shared libraries.
+    *-*-cygwin*)
+    LDFLAGS="-Wl,-no-undefined $LDFLAGS";;
+esac
+
 AC_SYS_LARGEFILE
 AC_PROG_CC
 LT_INIT
-- 
2.34.1