build: Only clean the architecture subdirectory we build for.

This allows simplifying the Makefiles; it is no longer necessary to register
arch subdirectory Makefiles, just putting them in place is enough.

Makefile

@@ -98,7 +98,7 @@ config.h: .config
 	@-printf '\nWARNING: $(?F) newer than config.h, rerun configure\n\n'
 	@-tput sgr0 2>/dev/null
 
-SUBDIR_VARS := CLEANFILES DIRS EXAMPLES FFLIBS HOSTPROGS TESTPROGS TOOLS \
+SUBDIR_VARS := CLEANFILES EXAMPLES FFLIBS HOSTPROGS TESTPROGS TOOLS      \
                ARCH_HEADERS BUILT_HEADERS SKIPHEADERS                    \
                ALTIVEC-OBJS ARMV6-OBJS MMX-OBJS NEON-OBJS YASM-OBJS      \
                OBJS TESTOBJS

libavcodec/Makefile

@@ -709,8 +709,6 @@ HOSTPROGS = aac_tablegen aacps_tablegen cbrt_tablegen cos_tablegen      \
             dv_tablegen motionpixels_tablegen mpegaudio_tablegen        \
             pcm_tablegen qdm2_tablegen sinewin_tablegen
 
-DIRS = alpha arm avr32 bfin mips ppc sh4 sparc x86
-
 CLEANFILES = *_tables.c *_tables.h *_tablegen$(HOSTEXESUF)
 
 $(SUBDIR)dct-test$(EXESUF): $(SUBDIR)dctref.o

libavfilter/Makefile

@@ -69,6 +69,4 @@ OBJS-$(CONFIG_TESTSRC_FILTER)                += vsrc_testsrc.o
 
 OBJS-$(CONFIG_NULLSINK_FILTER)               += vsink_nullsink.o
 
-DIRS = x86
-
 TOOLS = graph2dot lavfi-showfiltfmts

libavutil/Makefile

@@ -78,6 +78,4 @@ OBJS-$(ARCH_X86) += x86/cpu.o
 TESTPROGS = adler32 aes avstring base64 cpu crc des eval fifo lfg lls \
             md5 opt parseutils sha tree
 
-DIRS = arm avr32 bfin mips ppc sh4 tomi x86
-
 ARCH_HEADERS = bswap.h intmath.h intreadwrite.h timer.h

library.mak

@@ -47,12 +47,10 @@ $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SUBDIR)lib$(NAME).ver $(DEP_LIBS)
 
 clean::
 	$(RM) $(addprefix $(SUBDIR),*-example$(EXESUF) *-test$(EXESUF) $(CLEANFILES) $(CLEANSUFFIXES) $(LIBSUFFIXES)) \
-	    $(foreach dir,$(DIRS),$(CLEANSUFFIXES:%=$(SUBDIR)$(dir)/%)) \
-	    $(HOSTOBJS) $(HOSTPROGS)
+	    $(CLEANSUFFIXES:%=$(SUBDIR)$(ARCH)/%) $(HOSTOBJS) $(HOSTPROGS)
 
 distclean:: clean
-	$(RM) $(DISTCLEANSUFFIXES:%=$(SUBDIR)%) \
-	    $(foreach dir,$(DIRS),$(DISTCLEANSUFFIXES:%=$(SUBDIR)$(dir)/%))
+	$(RM) $(DISTCLEANSUFFIXES:%=$(SUBDIR)%) $(DISTCLEANSUFFIXES:%=$(SUBDIR)$(ARCH)/%)
 
 install-lib$(NAME)-shared: $(SUBDIR)$(SLIBNAME)
 	$(Q)mkdir -p "$(SHLIBDIR)"

libswscale/Makefile

@@ -29,5 +29,3 @@ MMX-OBJS-$(HAVE_YASM)      +=  x86/input.o              \
 OBJS-$(CONFIG_XMM_CLOBBER_TEST) += x86/w64xmmtest.o
 
 TESTPROGS = colorspace swscale
-
-DIRS = bfin ppc sparc x86