openbscdefines.h: Add header file to control visibility of symbols

Add the hooks/configure detection to compile everything with
-fvisibility=hidden and then make certain symbols visible. This
will be used to make parts of the API public.
There are no users yet but we should have some soon.
changes/88/3188/1
Holger Freyther 14 years ago
parent c7aa3c4f79
commit 6d9f77acd0
  1. 15
      configure.in
  2. 2
      include/openbsc/Makefile.am
  3. 35
      include/openbsc/openbscdefines.h

@ -18,6 +18,21 @@ AC_HEADER_STDC
dnl Checks for typedefs, structures and compiler characteristics
# The following test is taken from WebKit's webkit.m4
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden "
AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
AC_COMPILE_IFELSE([char foo;],
[ AC_MSG_RESULT([yes])
SYMBOL_VISIBILITY="-fvisibility=hidden"],
AC_MSG_RESULT([no]))
CFLAGS="$saved_CFLAGS"
AC_SUBST(SYMBOL_VISIBILITY)
dnl Generate the output
AM_CONFIG_HEADER(bscconfig.h)
AC_OUTPUT(
openbsc.pc
include/openbsc/Makefile

@ -2,4 +2,4 @@ noinst_HEADERS = abis_nm.h abis_rsl.h debug.h db.h gsm_04_08.h gsm_data.h \
gsm_subscriber.h linuxlist.h msgb.h select.h tlv.h gsm_04_11.h \
timer.h misdn.h chan_alloc.h telnet_interface.h paging.h \
subchan_demux.h trau_frame.h e1_input.h trau_mux.h signal.h \
gsm_utils.h ipaccess.h rs232.h
gsm_utils.h ipaccess.h rs232.h openbscdefines.h

@ -0,0 +1,35 @@
/*
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#ifndef OPENBSCDEFINES_H
#define OPENBSCDEFINES_H
#ifdef BUILDING_ON_WINDOWS
#ifdef BUILDING_OPENBSC
#define BSC_API __declspec(dllexport)
#else
#define BSC_API __declspec(dllimport)
#endif
#else
#define BSC_API __attribute__((visibility("default")))
#endif
#endif
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