enable version.h to be created from subdirs

Originally committed as revision 13819 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -67,14 +67,6 @@ ffserver_g$(EXESUF): FF_LDFLAGS += $(FFSERVERLDFLAGS)
 %_g$(EXESUF): %.o cmdutils.o $(FF_DEP_LIBS)
 	$(CC) $(FF_LDFLAGS) -o $@ $< cmdutils.o $(FF_EXTRALIBS)
 
-SVN_ENTRIES = $(SRC_PATH_BARE)/.svn/entries
-ifeq ($(wildcard $(SVN_ENTRIES)),$(SVN_ENTRIES))
-version.h: $(SVN_ENTRIES)
-endif
-
-version.h:
-	$(SRC_PATH)/version.sh $(SRC_PATH)
-
 output_example$(EXESUF): output_example.o $(FF_DEP_LIBS)
 	$(CC) $(CFLAGS) $(FF_LDFLAGS) -o $@ $< $(FF_EXTRALIBS)
 

common.mak

@@ -9,10 +9,16 @@ vpath %.c $(SRC_DIR)
 vpath %.h $(SRC_DIR)
 vpath %.S $(SRC_DIR)
 
+ifeq ($(SRC_DIR),$(SRC_PATH_BARE))
+BUILD_ROOT_REL = .
+else
+BUILD_ROOT_REL = ..
+endif
+
 ALLFFLIBS = avcodec avdevice avfilter avformat avutil postproc swscale
 
-CFLAGS = -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
-         -D_ISOC9X_SOURCE -I$(BUILD_ROOT) -I$(SRC_PATH) $(OPTFLAGS)
+CFLAGS := -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
+          -D_ISOC9X_SOURCE -I$(BUILD_ROOT_REL) -I$(SRC_PATH) $(OPTFLAGS)
 
 %.o: %.c
 	$(CC) $(CFLAGS) $(LIBOBJFLAGS) -c -o $@ $<
@@ -34,6 +40,14 @@ CFLAGS = -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
 
 %$(EXESUF): %.c
 
+SVN_ENTRIES = $(SRC_PATH_BARE)/.svn/entries
+ifeq ($(wildcard $(SVN_ENTRIES)),$(SVN_ENTRIES))
+$(BUILD_ROOT_REL)/version.h: $(SVN_ENTRIES)
+endif
+
+$(BUILD_ROOT_REL)/version.h:
+	$(SRC_PATH)/version.sh $(SRC_PATH) $@
+
 install: install-libs install-headers
 
 uninstall: uninstall-libs uninstall-headers

configure

@@ -969,7 +969,7 @@ 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)/,"'
+DEPEND_CMD='$(CC) $(CFLAGS) -MM -MG $< | sed -e "/^\#.*/d" -e "1s,^,$(@D)/," -e "s,[[:space:]]version\\.h,\$$(BUILD_ROOT_REL)/&,"'
 
 # find source path
 source_path="`dirname \"$0\"`"

version.sh

@@ -20,5 +20,5 @@ OLD_REVISION=`cat version.h 2> /dev/null`
 
 # Update version.h only on revision changes to avoid spurious rebuilds
 if test "$NEW_REVISION" != "$OLD_REVISION"; then
-    echo "$NEW_REVISION" > version.h
+    echo "$NEW_REVISION" > "$2"
 fi