Index: .gitignore
===================================================================
--- .gitignore
+++ .gitignore
@@ -24,6 +24,13 @@
 #==============================================================================#
 # Explicit files to ignore (only matches one).
 #==============================================================================#
+# Various tag programs
+/tags
+/TAGS
+/GPATH
+/GRTAGS
+/GSYMS
+/GTAGS
 .gitusers
 autom4te.cache
 cscope.files
@@ -35,6 +42,8 @@
 #==============================================================================#
 # Directories to ignore (do not add trailing '/'s, they skip symlinks).
 #==============================================================================#
+# LLVM build tree, by convention
+/build
 # External projects that are tracked independently.
 projects/*
 !projects/CMakeLists.txt