In file included from ffrec.c:46:
fxshim.h:104: warning: "__unused" redefined
 #define __unused
 
In file included from /usr/include/sys/types.h:42,
                 from fxshim.h:13,
                 from ffrec.c:46:
/usr/include/sys/cdefs.h:192: note: this is the location of the previous definition
 #define __unused __attribute__((__unused__))
 
In file included from ffrec.c:46:
feeder_mixer.c:402:16: warning: 'feeder_mixer_class' defined but not used [-Wunused-variable]
 FEEDER_DECLARE(feeder_mixer, NULL);
                ^~~~~~~~~~~~
fxshim.h:168:29: note: in definition of macro 'FEEDER_DECLARE'
  static struct feeder_class feeder ## _class = {   \
                             ^~~~~~
In file included from ffrec.c:172:
feeder_mixer.c:395:22: warning: 'feeder_mixer_methods' defined but not used [-Wunused-variable]
 static kobj_method_t feeder_mixer_methods[] = {
                      ^~~~~~~~~~~~~~~~~~~~
feeder_mixer.c:390:30: warning: 'feeder_mixer_desc' defined but not used [-Wunused-variable]
 static struct pcm_feederdesc feeder_mixer_desc[] = {
                              ^~~~~~~~~~~~~~~~~
In file included from ffrec.c:46:
feeder_matrix.c:537:16: warning: 'feeder_matrix_class' defined but not used [-Wunused-variable]
 FEEDER_DECLARE(feeder_matrix, NULL);
                ^~~~~~~~~~~~~
fxshim.h:168:29: note: in definition of macro 'FEEDER_DECLARE'
  static struct feeder_class feeder ## _class = {   \
                             ^~~~~~
In file included from ffrec.c:171:
feeder_matrix.c:530:22: warning: 'feeder_matrix_methods' defined but not used [-Wunused-variable]
 static kobj_method_t feeder_matrix_methods[] = {
                      ^~~~~~~~~~~~~~~~~~~~~
feeder_matrix.c:525:30: warning: 'feeder_matrix_desc' defined but not used [-Wunused-variable]
 static struct pcm_feederdesc feeder_matrix_desc[] = {
                              ^~~~~~~~~~~~~~~~~~
feeder_matrix.c:453:1: warning: 'feed_matrix_free' defined but not used [-Wunused-function]
 feed_matrix_free(struct pcm_feeder *f)
 ^~~~~~~~~~~~~~~~
In file included from fxsrc.c:5:
fxshim.h:104: warning: "__unused" redefined
 #define __unused
 
In file included from /usr/include/sys/types.h:42,
                 from fxshim.h:13,
                 from fxsrc.c:5:
/usr/include/sys/cdefs.h:192: note: this is the location of the previous definition
 #define __unused __attribute__((__unused__))
 
built ffrec (generator: in-tree /usr/src)