#
 # common bits used by all libraries
 #
 

 # first so "all" becomes default target
 all: all-yes

 ifndef SUBDIR
 
 ifndef V
 Q      = @
 ECHO   = printf "$(1)\t%s\n" $(2)

 BRIEF  = CC CXX AS YASM AR LD HOSTCC STRIP CP

 SILENT = DEPCC YASMDEP RM RANLIB
 MSG    = $@
 M      = @$(call ECHO,$(TAG),$@);
 $(foreach VAR,$(BRIEF), \
     $(eval override $(VAR) = @$$(call ECHO,$(VAR),$$(MSG)); $($(VAR))))
 $(foreach VAR,$(SILENT),$(eval override $(VAR) = @$($(VAR))))
 $(eval INSTALL = @$(call ECHO,INSTALL,$$(^:$(SRC_DIR)/%=%)); $(INSTALL))
 endif
 

 ALLFFLIBS = avcodec avdevice avfilter avformat avutil postproc swscale swresample

 # NASM requires -I path terminated with /

 IFLAGS     := -I. -I$(SRC_PATH)/
 CPPFLAGS   := $(IFLAGS) $(CPPFLAGS)
 CFLAGS     += $(ECFLAGS)
 CCFLAGS     = $(CFLAGS)

 CXXFLAGS   := $(CFLAGS) $(CXXFLAGS)

 YASMFLAGS  += $(IFLAGS) -I$(SRC_PATH)/libavutil/x86/ -Pconfig.asm

 HOSTCFLAGS += $(IFLAGS)

 LDFLAGS    := $(ALLFFLIBS:%=-Llib%) $(LDFLAGS)

 define COMPILE
        $($(1)DEP)
        $($(1)) $(CPPFLAGS) $($(1)FLAGS) $($(1)_DEPFLAGS) -c $($(1)_O) $<
 endef
 
 COMPILE_C = $(call COMPILE,CC)

 COMPILE_CXX = $(call COMPILE,CXX)

 COMPILE_S = $(call COMPILE,AS)
 

 %.o: %.c

 	$(COMPILE_C)

 %.o: %.cpp
 	$(COMPILE_CXX)
 

 %.s: %.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) -S -o $@ $<
 

 %.o: %.S

 	$(COMPILE_S)

 
 %.ho: %.h
 	$(CC) $(CPPFLAGS) $(CFLAGS) -Wno-unused -c -o $@ -x c $<
 
 %.ver: %.v
 	$(Q)sed 's/$$MAJOR/$($(basename $(@F))_VERSION_MAJOR)/' $^ > $@
 
 %.c %.h: TAG = GEN
 

 # Dummy rule to stop make trying to rebuild removed or renamed headers
 %.h:
 	@:
 
 # Disable suffix rules.  Most of the builtin rules are suffix rules,
 # so this saves some time on slow systems.
 .SUFFIXES:
 
 # Do not delete intermediate files from chains of implicit rules
 $(OBJS):

 endif
 

 OBJS-$(HAVE_MMX) +=  $(MMX-OBJS-yes)
 

 OBJS      += $(OBJS-yes)
 FFLIBS    := $(FFLIBS-yes) $(FFLIBS)
 TESTPROGS += $(TESTPROGS-yes)

 FFEXTRALIBS := $(FFLIBS:%=-l%$(BUILDSUF)) $(EXTRALIBS)

 EXAMPLES  := $(EXAMPLES:%=$(SUBDIR)%-example$(EXESUF))
 OBJS      := $(sort $(OBJS:%=$(SUBDIR)%))
 TESTOBJS  := $(TESTOBJS:%=$(SUBDIR)%) $(TESTPROGS:%=$(SUBDIR)%-test.o)
 TESTPROGS := $(TESTPROGS:%=$(SUBDIR)%-test$(EXESUF))
 HOSTOBJS  := $(HOSTPROGS:%=$(SUBDIR)%.o)
 HOSTPROGS := $(HOSTPROGS:%=$(SUBDIR)%$(HOSTEXESUF))

 TOOLS     += $(TOOLS-yes)
 TOOLOBJS  := $(TOOLS:%=tools/%.o)
 TOOLS     := $(TOOLS:%=tools/%$(EXESUF))

 DEP_LIBS := $(foreach NAME,$(FFLIBS),lib$(NAME)/$($(CONFIG_SHARED:yes=S)LIBNAME))

 ALLHEADERS := $(subst $(SRC_DIR)/,$(SUBDIR),$(wildcard $(SRC_DIR)/*.h $(SRC_DIR)/$(ARCH)/*.h))

 SKIPHEADERS += $(ARCH_HEADERS:%=$(ARCH)/%) $(SKIPHEADERS-)
 SKIPHEADERS := $(SKIPHEADERS:%=$(SUBDIR)%)

 checkheaders: $(filter-out $(SKIPHEADERS:.h=.ho),$(ALLHEADERS:.h=.ho))

 alltools: $(TOOLS)
 

 $(HOSTOBJS): %.o: %.c
 	$(HOSTCC) $(HOSTCFLAGS) -c -o $@ $<
 
 $(HOSTPROGS): %$(HOSTEXESUF): %.o
 	$(HOSTCC) $(HOSTLDFLAGS) -o $@ $< $(HOSTLIBS)
 

 $(OBJS):     | $(sort $(dir $(OBJS)))
 $(HOSTOBJS): | $(sort $(dir $(HOSTOBJS)))
 $(TESTOBJS): | $(sort $(dir $(TESTOBJS)))

 $(TOOLOBJS): | tools

 
 OBJDIRS := $(OBJDIRS) $(dir $(OBJS) $(HOSTOBJS) $(TESTOBJS))
 

 CLEANSUFFIXES     = *.d *.o *~ *.ho *.map *.ver *.gcno *.gcda

 DISTCLEANSUFFIXES = *.pc

 LIBSUFFIXES       = *.a *.lib *.so *.so.* *.dylib *.dll *.def *.dll.a *.exp

 -include $(wildcard $(OBJS:.o=.d) $(TESTOBJS:.o=.d))