Restrict symbols exported in the DSO

Only export those symbols into the shared object which are defined in
the API (ass.h).  A file libass.sym which contains a list of symbols
was added and libtool configured to use it.

2 files changed, 32 insertions, 0 deletions

diff --git a/libass/Makefile.am b/libass/Makefile.am
index 8703f6a..ccdeebc 100644
--- a/libass/Makefile.am
+++ b/libass/Makefile.am
@@ -8,6 +8,7 @@ libass_la_SOURCES = ass.c ass_cache.c ass_font.c ass_fontconfig.c ass_render.c \
                     ass_cache.h ass_fontconfig.h ass_font.h ass.h \
                     ass_library.h ass_types.h ass_utils.h help_mp.h
 libass_la_LDFLAGS = -version-info $(LIBASS_LT_CURRENT):$(LIBASS_LT_REVISION):$(LIBASS_LT_AGE)
+libass_la_LDFLAGS += -export-symbols $(srcdir)/libass.sym
 
 assheadersdir = $(includedir)/ass
 dist_assheaders_HEADERS = ass.h ass_types.h
diff --git a/libass/libass.sym b/libass/libass.sym
new file mode 100644
index 0000000..f363c85
--- /dev/null
+++ b/libass/libass.sym
@@ -0,0 +1,31 @@
+ass_library_init
+ass_library_done
+ass_set_fonts_dir
+ass_set_extract_fonts
+ass_set_style_overrides
+ass_renderer_init
+ass_renderer_done
+ass_set_frame_size
+ass_set_margins
+ass_set_use_margins
+ass_set_aspect_ratio
+ass_set_font_scale
+ass_set_hinting
+ass_set_line_spacing
+ass_set_fonts
+ass_render_frame
+ass_new_track
+ass_free_track
+ass_alloc_style
+ass_alloc_event
+ass_free_style
+ass_free_event
+ass_process_data
+ass_process_codec_private
+ass_process_chunk
+ass_read_file
+ass_read_memory
+ass_read_styles
+ass_add_font
+ass_clear_fonts
+ass_step_sub