allow to pass default dll list

m4/mingw.m4

-# libo_FIND_MINGW_EXTERNAL_DLLS([library-names],[variable],[?exclude])
+# libo_FIND_MINGW_EXTERNAL_DLLS([library-names],[variable],[?exclude],[?default-value])
 # uses: CC, SED, WITH_MINGW
 # --------------------------------------------------------------------
 AC_DEFUN([libo_FIND_MINGW_EXTERNAL_DLLS],
 [if test "$WITH_MINGW" = yes -a -n "$CC"; then
     _libo_mingw_libdir=`$CC -print-sysroot`/mingw/lib
-    for _libo_mingw_lib in $1; do
-        _libo_mingw_lib="$_libo_mingw_libdir/$_libo_mingw_lib.la"
-        _libo_mingw_find_dll([$_libo_mingw_lib],[$3],[_libo_mingw_new_dll])
-        if test -n "$_libo_mingw_new_dll"; then
-            _libo_mingw_new_dlls="$_libo_mingw_new_dll"
-        fi
-
-        _libo_mingw_get_libtool_var([dependency_libs],[$_libo_mingw_lib],[_libo_mingw_dep_libs])
-        for _libo_mingw_dep_lib in $_libo_mingw_dep_libs; do
-            if test "${_libo_mingw_dep_lib%.la}" != "$_libo_mingw_dep_lib"; then
-                _libo_mingw_new_dll=''
-                _libo_mingw_find_dll([$_libo_mingw_dep_lib],[$3],[_libo_mingw_new_dll])
-                if test -n "$_libo_mingw_new_dll"; then
-                    _libo_mingw_new_dlls="$_libo_mingw_new_dlls $_libo_mingw_new_dll"
-                fi
-            fi
-        done
-        $2="$_libo_mingw_new_dlls"
-    done
+    _libo_mingw_found_la=
+    _libo_mingw_test_la([$1],[_libo_mingw_found_la],[$_libo_mingw_libdir])
+    if test "$_libo_mingw_found_la" = yes; then
+        _libo_mingw_find_dlls([$1],[$2],[$3],[$_libo_mingw_libdir])
+    else
+        # no .la files found, use defaults
+        $2="$4"
+    fi
 fi[]dnl
 ]) # libo_FIND_MINGW_EXTERNAL_DLLS
 
-# libo_ADD_MINGW_EXTERNAL_DLLS([library-names],[variable])
+# libo_ADD_MINGW_EXTERNAL_DLLS([library-names],[variable],[?default-value])
 # uses: CC, SED, WITH_MINGW
 # --------------------------------------------------------
 AC_DEFUN([libo_ADD_MINGW_EXTERNAL_DLLS],
-[libo_FIND_MINGW_EXTERNAL_DLLS([$1],[_libo_mingw_found_dlls],[$$2])
+[libo_FIND_MINGW_EXTERNAL_DLLS([$1],[_libo_mingw_found_dlls],[$$2],[$3])
 if test -n "$_libo_mingw_found_dlls"; then
     $2="$$2 $_libo_mingw_found_dlls"
 fi[]dnl
@@ -43,18 +32,51 @@ m4_define([_libo_mingw_get_libtool_var],
 
 # _libo_mingw_find_dll([library],[dlls],[out-var])
 m4_define([_libo_mingw_find_dll],
-[if test -f "$1"; then
-    _libo_mingw_get_libtool_var([dlname],[$1],[_libo_mingw_dlname])
-    _libo_mingw_dlname=`basename $_libo_mingw_dlname`
-    _libo_mingw_dll_present=
-    for _libo_mingw_dll in $2; do
-        if test "$_libo_mingw_dlname" = "$_libo_mingw_dll"; then
-            _libo_mingw_dll_present=yes
-            break
-        fi
-    done
-    if test -z "$_libo_mingw_dll_present"; then
-        $3="$_libo_mingw_dlname"
+[_libo_mingw_get_libtool_var([dlname],[$1],[_libo_mingw_dlname])
+_libo_mingw_dlname=`basename $_libo_mingw_dlname`
+_libo_mingw_dll_present=
+for _libo_mingw_dll in $2; do
+    if test "$_libo_mingw_dlname" = "$_libo_mingw_dll"; then
+        _libo_mingw_dll_present=yes
+        break
     fi
+done
+if test -z "$_libo_mingw_dll_present"; then
+    $3="$_libo_mingw_dlname"
 fi[]dnl
 ]) # _libo_mingw_find_dll
+
+# _libo_mingw_find_dlls([libraries],[dlls],[out-var],[libdir])
+m4_define([_libo_mingw_find_dlls],
+[_libo_mingw_new_dlls=
+for _libo_mingw_lib in $1; do
+    _libo_mingw_lib="$4/$_libo_mingw_lib.la"
+    _libo_mingw_new_dll=
+    _libo_mingw_find_dll([$_libo_mingw_lib],[$3 $_libo_mingw_new_dlls],[_libo_mingw_new_dll])
+    if test -n "$_libo_mingw_new_dll"; then
+        _libo_mingw_new_dlls="$_libo_mingw_new_dlls $_libo_mingw_new_dll"
+    fi
+
+    _libo_mingw_get_libtool_var([dependency_libs],[$_libo_mingw_lib],[_libo_mingw_dep_libs])
+    for _libo_mingw_dep_lib in $_libo_mingw_dep_libs; do
+        if test "${_libo_mingw_dep_lib%.la}" != "$_libo_mingw_dep_lib"; then
+            _libo_mingw_new_dll=''
+            _libo_mingw_find_dll([$_libo_mingw_dep_lib],[$3 $_libo_mingw_new_dlls],[_libo_mingw_new_dll])
+            if test -n "$_libo_mingw_new_dll"; then
+                _libo_mingw_new_dlls="$_libo_mingw_new_dlls $_libo_mingw_new_dll"
+            fi
+        fi
+    done
+done
+$2="$_libo_mingw_new_dlls"[]dnl
+]) # _libo_mingw_find_dlls
+
+# _libo_mingw_test_la([libraries],[out-var],[libdir])
+m4_define([_libo_mingw_test_la],
+[for _libo_mingw_lib in $1; do
+    if test -f "$3/$_libo_mingw_lib.la"; then
+        $2=yes
+        break
+    fi
+done[]dnl
+]) # _libo_mingw_test_la