Add trunk revision number on the online HTML docs.

Patch by Vassil Vassilev.
PR13435

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193495 91177308-0d34-0410-b5e6-96231b3b80d8

docs/Makefile

@@ -80,6 +80,8 @@ regendoc:
 	$(Echo) Building doxygen documentation
 	$(Verb) $(RM) -rf $(PROJ_OBJ_DIR)/doxygen
 	$(Verb) $(DOXYGEN) $(PROJ_OBJ_DIR)/doxygen.cfg
+	$(Verb) sed -i "s/[$$]LatestRev[$$]/`svnversion $(PROJ_SRC_DIR)`/g" \
+	 $(PROJ_OBJ_DIR)/doxygen/html/*.html
 
 $(PROJ_OBJ_DIR)/doxygen.tar.gz: $(DOXYFILES) $(PROJ_OBJ_DIR)/doxygen.cfg
 	$(Echo) Packaging doxygen documentation

docs/doxygen.footer

 <hr>
 <p class="footer">
-Generated on $datetime by <a href="http://www.doxygen.org">Doxygen 
+Generated on $datetime for r$LatestRev$ by <a href="http://www.doxygen.org">Doxygen 
 $doxygenversion</a>.</p>
 
 <p class="footer">