../../doltlibtool  --tag=CC   --mode=compile cc -DHAVE_CONFIG_H -I. -I../..  -DMODULE_NAME=$(p="libdynamicoverlay_plugin_la-dynamicoverlay_buffer.lo"; p="${p##*/}"; p="${p#lib}"; echo "${p%_plugin*}") -DMODULE_NAME_IS_$(p="libdynamicoverlay_plugin_la-dynamicoverlay_buffer.lo"; p="${p##*/}"; p="${p#lib}"; echo "${p%_plugin*}") -DMODULE_STRING=\"$(p="libdynamicoverlay_plugin_la-dynamicoverlay_buffer.lo"; p="${p##*/}"; p="${p#lib}"; echo "${p%_plugin*}")\" -D__PLUGIN__ -I../../include -I../../include -I/usr/local/include/gnutls3 -I/usr/local/include -DLIBICONV_PLUG  -O2 -pipe -march=corei7  -DLIBICONV_PLUG -fno-strict-aliasing -Wall -Wextra -Wsign-compare -Wundef -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wmissing-prototypes -Wvolatile-register-var -Werror-implicit-function-declaration -pipe -fvisibility=hidden -MT libdynamicoverlay_plugin_la-dynamicoverlay_buffer.lo -MD -MP -MF .deps/libdynamicoverlay_plugin_la-dynamicoverlay_buffer.Tpo -c -o libdynamicoverlay_plugin_la-dynamicoverlay_buffer.lo `test -f 'dynamicoverlay/dynamicoverlay_buffer.c' || echo './'`dynamicoverlay/dynamicoverlay_buffer.c
In file included from deinterlace/algo_yadif.c:48:
In file included from deinterlace/yadif.h:49:
deinterlace/yadif_template.h:262:9: error: inline assembly requires more registers than
      available
        FILTER
        ^
deinterlace/yadif_template.h:135:13: note: expanded from macro 'FILTER'
            "pxor      "MM"7, "MM"7 \n\t"\
            ^
deinterlace/yadif_template.h:256:9: error: inline assembly requires more registers than
      available
        FILTER
        ^
deinterlace/yadif_template.h:135:13: note: expanded from macro 'FILTER'
            "pxor      "MM"7, "MM"7 \n\t"\
            ^
3 warnings and 2 errors generated.
deinterlace/algo_ivtc.c:gmake[6]: 179:30: warning: *** [libdeinterlace_plugin_la-algo_yadif.lo] Error 1
unused gmake[6]: variable 'pi_worst_field_pairs'
      [-Wunused-const-variable]
*** Waiting for unfinished jobs....
static const ivtc_field_pair pi_worst_field_pairs[NUM_CADENCE_POS][4] = {
                             ^
mv -f .deps/libdynamicoverlay_plugin_la-dynamicoverlay_buffer.Tpo .deps/libdynamicoverlay_plugin_la-dynamicoverlay_buffer.Plo
1 warning generated.
mv -f .deps/libdeinterlace_plugin_la-algo_ivtc.Tpo .deps/libdeinterlace_plugin_la-algo_ivtc.Plo
gmake[6]: Leaving directory `/usr/ports/multimedia/vlc/work/vlc-2.1.4/modules/video_filter'

clang well-known registers trouble

VDPAU option should be enabled. It applies also to some VDPAU-ports (ffmpeg, mplayer, etc)