#
 # 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 HOSTCC HOSTLD AS YASM AR LD STRIP CP WINDRES

 SILENT = DEPCC DEPHOSTCC DEPAS DEPYASM RANLIB RM
 

 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 avresample avutil postproc swscale swresample

 # NASM requires -I path terminated with /

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

 CCFLAGS     = $(CPPFLAGS) $(CFLAGS)
 ASFLAGS    := $(CPPFLAGS) $(ASFLAGS)

 CXXFLAGS   += $(CPPFLAGS) $(CFLAGS)

 YASMFLAGS  += $(IFLAGS:%=%/) -Pconfig.asm

 HOSTCCFLAGS = $(IFLAGS) $(HOSTCPPFLAGS) $(HOSTCFLAGS)

 LDFLAGS    := $(ALLFFLIBS:%=$(LD_PATH)lib%) $(LDFLAGS)

 define COMPILE

        $(call $(1)DEP,$(1))

        $($(1)) $($(1)FLAGS) $($(1)_DEPFLAGS) $($(1)_C) $($(1)_O) $<

 endef
 
 COMPILE_C = $(call COMPILE,CC)

 COMPILE_CXX = $(call COMPILE,CXX)

 COMPILE_S = $(call COMPILE,AS)

 COMPILE_HOSTC = $(call COMPILE,HOSTCC)

 %.o: %.c

 	$(COMPILE_C)

 %.o: %.cpp
 	$(COMPILE_CXX)
 

 %.o: %.m
 	$(COMPILE_C)
 

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

 %.o: %.S

 	$(COMPILE_S)

 %_host.o: %.c
 	$(COMPILE_HOSTC)
 

 %.o: %.rc

 	$(WINDRES) $(IFLAGS) --preprocessor "$(DEPWINDRES) -E -xc-header -DRC_INVOKED $(CC_DEPFLAGS)" -o $@ $<

 %.i: %.c
 	$(CC) $(CCFLAGS) $(CC_E) $<
 

 %.h.c:
 	$(Q)echo '#include "$*.h"' >$@

 
 %.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
 

 include $(SRC_PATH)/arch.mak

 OBJS      += $(OBJS-yes)

 SLIBOBJS  += $(SLIBOBJS-yes)

 FFLIBS    := $($(NAME)_FFLIBS) $(FFLIBS-yes) $(FFLIBS)

 TESTPROGS += $(TESTPROGS-yes)

 LDLIBS       = $(FFLIBS:%=%$(BUILDSUF))
 FFEXTRALIBS := $(LDLIBS:%=$(LD_LIB)) $(EXTRALIBS)

 OBJS      := $(sort $(OBJS:%=$(SUBDIR)%))

 SLIBOBJS  := $(sort $(SLIBOBJS:%=$(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))

 HEADERS   += $(HEADERS-yes)

 PATH_LIBNAME = $(foreach NAME,$(1),lib$(NAME)/$($(CONFIG_SHARED:yes=S)LIBNAME))
 DEP_LIBS := $(foreach lib,$(FFLIBS),$(call PATH_LIBNAME,$(lib)))

 SRC_DIR    := $(SRC_PATH)/lib$(NAME)

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

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

 HOBJS        = $(filter-out $(SKIPHEADERS:.h=.h.o),$(ALLHEADERS:.h=.h.o))
 checkheaders: $(HOBJS)
 .SECONDARY:   $(HOBJS:.o=.c)

 alltools: $(TOOLS)
 

 $(HOSTOBJS): %.o: %.c

 	$(COMPILE_HOSTC)

 
 $(HOSTPROGS): %$(HOSTEXESUF): %.o

 	$(HOSTLD) $(HOSTLDFLAGS) $(HOSTLD_O) $^ $(HOSTLIBS)

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

 $(HOBJS):    | $(sort $(dir $(HOBJS)))

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

 $(SLIBOBJS): | $(sort $(dir $(SLIBOBJS)))

 $(TESTOBJS): | $(sort $(dir $(TESTOBJS)))
 $(TOOLOBJS): | tools

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

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

 DISTCLEANSUFFIXES = *.pc

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

 define RULES

 clean::
 	$(RM) $(OBJS) $(OBJS:.o=.d)

 	$(RM) $(HOSTPROGS)
 	$(RM) $(TOOLS)
 endef
 
 $(eval $(RULES))

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