Merge branch 't/const'

diff --combined Makefile.in
index 24b06fb97c7ba6302c14acc1f06da40b5e0783b6,ca79f8b9948235970e31da5c9ecf2a96a53b9672..cfc6909a7e1737466b0042ee455aee53bed64fc8
--- 1/Makefile.in
--- 2/Makefile.in
+++ b/Makefile.in
@@@ -32,6 -32,7 +32,7 @@@ DEBUG_CPPFLAGS += -Wmissing-format-attr
  # DEBUG_CPPFLAGS += -Wextra
  # DEBUG_CPPFLAGS += -Wold-style-definition
  # DEBUG_CPPFLAGS += -Wdeclaration-after-statement
+ # DEBUG_CPPFLAGS += -Wsuggest-attribute=const
  
  # many warnings about trivial stuff
  # CPPFLAGS += -Wconversion
@@@ -195,9 -196,6 +196,9 @@@ $(object_dir)/aac_afh.o: aac_afh.c | $(
  $(object_dir)/gui%.o: gui%.c | $(object_dir)
        @[ -z "$(Q)" ] || echo 'CC $<'
        $(Q) $(CC) -c -o $@ $(CPPFLAGS) $(DEBUG_CPPFLAGS) @curses_cppflags@ $<
 +$(object_dir)/ao_write.o: ao_write.c | $(object_dir)
 +      @[ -z "$(Q)" ] || echo 'CC $<'
 +      $(Q) $(CC) -c -o $@ $(CPPFLAGS) $(DEBUG_CPPFLAGS) @ao_cppflags@ $<
  
  $(object_dir)/%.cmdline.o: $(cmdline_dir)/%.cmdline.c $(cmdline_dir)/%.cmdline.h | $(object_dir)
        @[ -z "$(Q)" ] || echo 'CC $<'