Use a linker version script for libguile.

* libguile/Makefile.am (libguile_la_LDFLAGS)[HAVE_LD_VERSION_SCRIPT]:
  Use `libguile.map'.
  (EXTRA_DIST): Add `libguile.map'.

* libguile/libguile.map: New file.

libguile/Makefile.am

@@ -223,6 +223,13 @@ libguile_la_DEPENDENCIES = @LIBLOBJS@
 libguile_la_LIBADD = @LIBLOBJS@ $(gnulib_library) $(LTLIBGMP) $(LTLIBUNISTRING)
 libguile_la_LDFLAGS = @LTLIBINTL@ -version-info @LIBGUILE_INTERFACE_CURRENT@:@LIBGUILE_INTERFACE_REVISION@:@LIBGUILE_INTERFACE_AGE@ -export-dynamic -no-undefined
 
+if HAVE_LD_VERSION_SCRIPT
+
+libguile_la_LDFLAGS += -Wl,--version-script="$(srcdir)/libguile.map"
+
+endif HAVE_LD_VERSION_SCRIPT
+
+
 # These are headers visible as <guile/mumble.h>
 pkginclude_HEADERS = 
 
@@ -264,7 +271,7 @@ EXTRA_DIST = ChangeLog-scm ChangeLog-threads		\
     cpp_errno.c cpp_err_symbols.in cpp_err_symbols.c			\
     cpp_sig_symbols.c cpp_sig_symbols.in cpp_cnvt.awk			\
     c-tokenize.lex version.h.in						\
-    scmconfig.h.top libgettext.h
+    scmconfig.h.top libgettext.h libguile.map
 #    $(DOT_DOC_FILES) $(EXTRA_DOT_DOC_FILES) \
 #    guile-procedures.txt guile.texi
 

libguile/libguile.map

@@ -0,0 +1,44 @@
+# Linker version script for libguile.           -*- ld-script -*-
+#
+# Copyright (C) 2009 Free Software Foundation, Inc.
+#
+# This file is part of GUILE.
+#
+# GUILE is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 3, or
+# (at your option) any later version.
+#
+# GUILE 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with GUILE; see the file COPYING.LESSER.  If not,
+# write to the Free Software Foundation, Inc., 51 Franklin Street,
+# Fifth Floor, Boston, MA 02110-1301 USA
+
+GUILE_2.0
+{
+  global:
+    # Note: This includes `scm_i_' symbols declared as `SCM_API' (e.g.,
+    # symbols from `deprecated.c' or symbols used by public inline
+    # functions or macros).
+    scm_*;
+
+    # GDB interface.
+    gdb_options;
+    gdb_language;
+    gdb_result;
+    gdb_output;
+    gdb_output_length;
+    gdb_maybe_valid_type_p;
+    gdb_read;
+    gdb_eval;
+    gdb_print;
+    gdb_binding;
+
+  local:
+    *;
+};