Use the '-z defs' linker option if supported to better catch undefined

symbols.

configure

@@ -10234,6 +10234,52 @@ echo "${ECHO_T}$ac_cv_c_dll_gnuelf" >&6
       then
         LDSHARED="\$(CC) -shared \$(SONAME:%=-Wl,-soname,%)"
         LDDLLFLAGS="-Wl,-Bsymbolic"
+        echo "$as_me:$LINENO: checking whether the linker accepts -z defs" >&5
+echo $ECHO_N "checking whether the linker accepts -z defs... $ECHO_C" >&6
+if test "${ac_cv_c_dll_zdefs+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_wine_try_cflags_saved=$CFLAGS
+CFLAGS="$CFLAGS -fPIC -shared -Wl,-Bsymbolic,-z,defs"
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_c_dll_zdefs="yes"
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_cv_c_dll_zdefs="no"
+fi
+rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
+CFLAGS=$ac_wine_try_cflags_saved
+fi
+echo "$as_me:$LINENO: result: $ac_cv_c_dll_zdefs" >&5
+echo "${ECHO_T}$ac_cv_c_dll_zdefs" >&6
+        if test "$ac_cv_c_dll_zdefs" = "yes"
+        then
+          LDDLLFLAGS="$LDDLLFLAGS,-z,defs"
+        fi
       else
         echo "$as_me:$LINENO: checking whether we can build a UnixWare (Solaris) dll" >&5
 echo $ECHO_N "checking whether we can build a UnixWare (Solaris) dll... $ECHO_C" >&6

configure.ac

@@ -793,6 +793,13 @@ case $host_os in
       then
         LDSHARED="\$(CC) -shared \$(SONAME:%=-Wl,-soname,%)"
         LDDLLFLAGS="-Wl,-Bsymbolic"
+        AC_CACHE_CHECK([whether the linker accepts -z defs], ac_cv_c_dll_zdefs,
+          [WINE_TRY_CFLAGS([-fPIC -shared -Wl,-Bsymbolic,-z,defs],
+                           ac_cv_c_dll_zdefs="yes",ac_cv_c_dll_zdefs="no")])
+        if test "$ac_cv_c_dll_zdefs" = "yes"
+        then
+          LDDLLFLAGS="$LDDLLFLAGS,-z,defs"
+        fi
       else
         AC_CACHE_CHECK(whether we can build a UnixWare (Solaris) dll, ac_cv_c_dll_unixware,
             [WINE_TRY_CFLAGS([-fPIC -Wl,-G,-h,conftest.so.1.0,-B,symbolic],