libvpx: Pull from upstream

source/libvpx/examples.mk

 ##
 ##  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 ##
 ##  Use of this source code is governed by a BSD-style license
 ##  that can be found in the LICENSE file in the root of the source
 ##  tree. An additional intellectual property rights grant can be found
 ##  in the file PATENTS.  All contributing project authors may
 ##  be found in the AUTHORS file in the root of the source tree.
 ##
 
@@ skipping 320 matching lines @@
 INSTALL-BINS-$(CONFIG_MSVS) += $(foreach p,$(VS_PLATFORMS),\
                                $(addprefix bin/$(p)/,$(ALL_EXAMPLES_BASENAME:.c=.exe)))
 $(foreach proj,$(call enabled,PROJECTS),\
     $(eval $(call vcproj_template,$(proj))))
 
 #
 # Documentation Rules
 #
 %.dox: %.c
         @echo "    [DOXY] $@"
+        @mkdir -p $(dir $@)
         @echo "/*!\page example_$(@F:.dox=) $(@F:.dox=)" > $@
         @echo "   \includelineno $(<F)" >> $@
         @echo "*/" >> $@
 
 samples.dox: examples.mk
         @echo "    [DOXY] $@"
         @echo "/*!\page samples Sample Code" > $@
         @echo "    This SDK includes a number of sample applications."\
               "Each sample documents a feature of the SDK in both prose"\
               "and the associated C code."\
               "The following samples are included: ">>$@
         @$(foreach ex,$(sort $(notdir $(EXAMPLES:.c=))),\
            echo "     - \subpage example_$(ex) $($(ex).DESCRIPTION)" >> $@;)
         @echo >> $@
         @echo "    In addition, the SDK contains a number of utilities."\
               "Since these utilities are built upon the concepts described"\
               "in the sample code listed above, they are not documented in"\
               "pieces like the samples are. Their source is included here"\
               "for reference. The following utilities are included:" >> $@
         @$(foreach ex,$(sort $(UTILS:.c=)),\
            echo "     - \subpage example_$(ex) $($(ex).DESCRIPTION)" >> $@;)
         @echo "*/" >> $@
 
 CLEAN-OBJS += examples.doxy samples.dox $(ALL_EXAMPLES:.c=.dox)
 DOCS-yes += examples.doxy samples.dox
 examples.doxy: samples.dox $(ALL_EXAMPLES:.c=.dox)
         @echo "INPUT += $^" > $@