Index: llvm/trunk/docs/CMake.rst
===================================================================
--- llvm/trunk/docs/CMake.rst
+++ llvm/trunk/docs/CMake.rst
@@ -387,6 +387,10 @@
   ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``; otherwise this has no
   effect.
 
+**LLVM_DOXYGEN_SVG**:BOOL
+  Uses .svg files instead of .png files for graphs in the Doxygen output.
+  Defaults to OFF.
+
 **LLVM_ENABLE_SPHINX**:BOOL
   If enabled CMake will search for the ``sphinx-build`` executable and will make
   the ``SPHINX_OUTPUT_HTML`` and ``SPHINX_OUTPUT_MAN`` CMake options available.
Index: llvm/trunk/docs/CMakeLists.txt
===================================================================
--- llvm/trunk/docs/CMakeLists.txt
+++ llvm/trunk/docs/CMakeLists.txt
@@ -56,6 +56,14 @@
     set(llvm_doxygen_qhp_cust_filter_attrs "")
   endif()
   
+  option(LLVM_DOXYGEN_SVG
+    "Use svg instead of png files for doxygen graphs." OFF)
+  if (LLVM_DOXYGEN_SVG)
+    set(DOT_IMAGE_FORMAT "svg")
+  else()
+    set(DOT_IMAGE_FORMAT "png")
+  endif()
+
   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/doxygen.cfg.in
     ${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg @ONLY)
 
@@ -73,6 +81,7 @@
   set(llvm_doxygen_qhelpgenerator_path)
   set(llvm_doxygen_qhp_cust_filter_name)
   set(llvm_doxygen_qhp_cust_filter_attrs)
+  set(DOT_IMAGE_FORMAT)
 
   add_custom_target(doxygen-llvm
     COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/doxygen.cfg
Index: llvm/trunk/docs/Makefile
===================================================================
--- llvm/trunk/docs/Makefile
+++ llvm/trunk/docs/Makefile
@@ -31,6 +31,7 @@
 	  -e 's/@llvm_doxygen_qhp_cust_filter_name@//g' \
 	  -e 's/@llvm_doxygen_qhp_namespace@//g' \
 	  -e 's/@searchengine_url@//g' \
+	  -e 's/@DOT_IMAGE_FORMAT@/png/g' \
 	  > $@
 endif
 
Index: llvm/trunk/docs/doxygen.cfg.in
===================================================================
--- llvm/trunk/docs/doxygen.cfg.in
+++ llvm/trunk/docs/doxygen.cfg.in
@@ -2205,7 +2205,7 @@
 # The default value is: png.
 # This tag requires that the tag HAVE_DOT is set to YES.
 
-DOT_IMAGE_FORMAT       = png
+DOT_IMAGE_FORMAT       = @DOT_IMAGE_FORMAT@
 
 # If DOT_IMAGE_FORMAT is set to svg, then this option can be set to YES to
 # enable generation of interactive SVG images that allow zooming and panning.