gr_no_undefined.m4

Revision 3751 (checked in by jcorgan, 2 years ago)	Applied changeset r3746 on trunk to release branch.
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1	dnl
2	dnl Copyright 2005 Free Software Foundation, Inc.
3	dnl
4	dnl This file is part of GNU Radio
5	dnl
6	dnl GNU Radio is free software; you can redistribute it and/or modify
7	dnl it under the terms of the GNU General Public License as published by
8	dnl the Free Software Foundation; either version 2, or (at your option)
9	dnl any later version.
10	dnl
11	dnl GNU Radio is distributed in the hope that it will be useful,
12	dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
13	dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	dnl GNU General Public License for more details.
15	dnl
16	dnl You should have received a copy of the GNU General Public License
17	dnl along with GNU Radio; see the file COPYING. If not, write to
18	dnl the Free Software Foundation, Inc., 51 Franklin Street,
19	dnl Boston, MA 02110-1301, USA.
20	dnl
21
22	# GR_NO_UNDEFINED()
23	#
24	# Detemine whether we need to use the -no-undefined linker flag
25	# when building shared libraries.
26	# Sets NO_UNDEFINED to "" or "-no-undefined"
27	#
28	# As far as I can tell, we need -no-undefined only when building
29	# windows DLLs. This occurs when using MinGW and Cygwin.
30	#
31	# For now, we stub this out.
32
33	AC_DEFUN([GR_NO_UNDEFINED],[
34	AC_REQUIRE([AC_CANONICAL_HOST])
35	no_undefined=""
36	case "${host_os}" in
37	mingw \| cygwin)
38
39	# on MinGW/Cygwin extra LDFLAGS are required
40	no_undefined="-no-undefined"
41	;;
42	esac
43	AC_SUBST(NO_UNDEFINED,[$no_undefined])
44	])

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