From 858276a2e832704ad5c461e5db22cfd6c978b87a Mon Sep 17 00:00:00 2001
From: Christian Babeux <christian.babeux@efficios.com>
Date: Tue, 27 Nov 2012 20:31:47 -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.
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 511da2e9..22d5ee5d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,6 +169,10 @@ got it
                     [ust_cv_i386_is_x86_64=no])
                     CPPFLAGS="$save_CPPFLAGS"])
     ;;
+    # 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_MSG_CHECKING([library format for the host system])
-- 
2.34.1