regenerate dependencies when building object files

Originally committed as revision 14143 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -38,6 +38,8 @@ CFLAGS := -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
 %.d: %.cpp
 	$(DEPEND_CMD) > $@
 
+%.o: %.d
+
 %$(EXESUF): %.c
 
 SVN_ENTRIES = $(SRC_PATH_BARE)/.svn/entries

configure

@@ -970,7 +970,7 @@ SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
 LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
 
 # gcc stupidly only outputs the basename of targets with -MM
-DEPEND_CMD='$(CC) $(CFLAGS) -MM -MG $< | sed -e "/^\#.*/d" -e "1s,^,$(@D)/," -e "s,\\([[:space:]]\\)\\(version\\.h\\),\\1\$$(BUILD_ROOT_REL)/\\2," -e "s/\(.*\)\.o/\1.d &/"'
+DEPEND_CMD='$(CC) $(CFLAGS) -MM -MG $< | sed -e "/^\#.*/d" -e "1s,^,$(@D)/," -e "s,\\([[:space:]]\\)\\(version\\.h\\),\\1\$$(BUILD_ROOT_REL)/\\2,"'
 
 # find source path
 source_path="`dirname \"$0\"`"