Merge branch 'upstream' into dfsg-orig

[debian/gnuradio] / gr-howto-write-a-block / config / gr_no_undefined.m4

diff --git a/gr-howto-write-a-block/config/gr_no_undefined.m4 b/gr-howto-write-a-block/config/gr_no_undefined.m4
new file mode 100644 (file)
index 0000000..c8d745d
--- /dev/null
+++ b/gr-howto-write-a-block/config/gr_no_undefined.m4
@@ -0,0 +1,44 @@
+dnl
+dnl Copyright 2005 Free Software Foundation, Inc.
+dnl 
+dnl This file is part of GNU Radio
+dnl 
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl 
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING.  If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+dnl 
+
+# GR_NO_UNDEFINED()
+#
+# Detemine whether we need to use the -no-undefined linker flag
+# when building shared libraries.  
+# Sets NO_UNDEFINED to "" or "-no-undefined"
+# 
+# As far as I can tell, we need -no-undefined only when building
+# windows DLLs.  This occurs when using MinGW and Cygwin.
+#
+# For now, we stub this out.
+
+AC_DEFUN([GR_NO_UNDEFINED],[
+       AC_REQUIRE([AC_CANONICAL_HOST])
+       no_undefined=""
+       case "${host_os}" in
+               *mingw* | *cygwin*)
+
+               # on MinGW/Cygwin extra LDFLAGS are required
+               no_undefined="-no-undefined"
+               ;;
+       esac
+       AC_SUBST(NO_UNDEFINED,[$no_undefined])
+])