Ensure libvlc only export symbols from libvlc API

src/Makefile.am

@@ -158,8 +158,8 @@ libvlc_la_LIBADD = $(INCLUDED_LIBINTL)
 libvlc_la_CFLAGS = `$(VLC_CONFIG) --cflags vlc`
 libvlc_la_CXXFLAGS = `$(VLC_CONFIG) --cxxflags vlc`
 libvlc_la_OBJCFLAGS = `$(VLC_CONFIG) --objcflags vlc`
-libvlc_la_LDFLAGS = `$(VLC_CONFIG) --libs vlc builtin|sed -e 's/\(modules\/[^ ]*\)\.a /\1_builtin.la /g'` -no-undefined
-libvlc_la_DEPENDENCIES = stamp-builtins
+libvlc_la_LDFLAGS = `$(VLC_CONFIG) --libs vlc builtin|sed -e 's/\(modules\/[^ ]*\)\.a /\1_builtin.la /g'` -no-undefined -export-symbols libvlc.sym
+libvlc_la_DEPENDENCIES = stamp-builtins stamp-api
 
 
 if HAVE_BEOS
@@ -378,6 +378,10 @@ stamp-api: Makefile.in $(HEADERS_include) ../vlc-api.pl
 	  top_srcdir="$(top_srcdir)" perl $(top_srcdir)/vlc-api.pl
 	touch stamp-api
 
+libvlc.sym:
+	rm -f stamp-api
+	$(MAKE) stamp-api
+
 ###############################################################################
 # Unit/regression test
 ###############################################################################

vlc-api.pl

@@ -31,20 +31,24 @@ my $srcdir = $ENV{'top_srcdir'};
 # Reads to-be exported APIs
 #
 my %new_APIs;
+my $new_sym = IO::Handle->new();
+open $new_sym, '> libvlc.sym' or die "libvlc.sym: $!\n";
 
 while (<STDIN>)
 {
 	if (/VLC_EXPORT\(\s*(\w.*\S)\s*,\s*(\w*)\s*,\s*\(\s*(\w.*\S)\s*\)\s*\)[^)]*$/)
 	{
 		$new_APIs{$2} = [ ( $1, $3 ) ];
+		print { $new_sym } "$2\n";
 	} 
 }
 
+close $new_sym;
+
 #
 # Write header's header
 #
-my $new_sym=IO::Handle->new();
-open $new_sym, '> vlc_symbols.h.new' or die "$!";
+open $new_sym, '> vlc_symbols.h.new' or die "vlc_symbols.h.new: $!\n";
 print { $new_sym }
 	"/*\n".
 	" * This file is automatically generated. DO NOT EDIT!\n".