From 62f80e22b22eb076e649fc0aee8bbb2c292fa17b Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Thu, 7 Apr 2016 21:43:54 -0700
Subject: cmake: Enable use of dot for Doxygen

---
 host/docs/CMakeLists.txt | 7 +++++++
 host/docs/Doxyfile.in    | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/host/docs/CMakeLists.txt b/host/docs/CMakeLists.txt
index 3090d3f80..96f388b2e 100644
--- a/host/docs/CMakeLists.txt
+++ b/host/docs/CMakeLists.txt
@@ -66,6 +66,7 @@ ENDIF(ENABLE_MANUAL)
 MESSAGE(STATUS "")
 LIBUHD_REGISTER_COMPONENT("API/Doxygen" ENABLE_DOXYGEN ON "DOXYGEN_FOUND" OFF OFF)
 OPTION(ENABLE_DOXYGEN_FULL "Use Doxygen to document the entire source tree (not just API)" OFF)
+OPTION(ENABLE_DOXYGEN_DOT "Let Doxygen use dot (requires graphviz)" OFF)
 
 IF(LIBUHDDEV_PKG)
     SET(PKG_DOC_DIR share/doc/libuhd-dev)
@@ -94,6 +95,12 @@ MESSAGE(STATUS "")
 IF(ENABLE_MANUAL_OR_DOXYGEN)
     #generate the doxygen configuration file
     SET(CMAKE_CURRENT_BINARY_DIR_DOXYGEN ${CMAKE_CURRENT_BINARY_DIR}/doxygen)
+    IF(ENABLE_DOXYGEN_DOT)
+        SET(DOXYGEN_HAVE_DOT "YES")
+    ELSE(ENABLE_DOXYGEN_DOT)
+        SET(DOXYGEN_HAVE_DOT "NO")
+    ENDIF(ENABLE_DOXYGEN_DOT)
+
     CONFIGURE_FILE(
         ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
         ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
diff --git a/host/docs/Doxyfile.in b/host/docs/Doxyfile.in
index d984b6f6b..8aa6299ae 100644
--- a/host/docs/Doxyfile.in
+++ b/host/docs/Doxyfile.in
@@ -1686,7 +1686,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # toolkit from AT&T and Lucent Bell Labs. The other options in this section
 # have no effect if this option is set to NO (the default)
 
-HAVE_DOT               = NO
+HAVE_DOT               = @DOXYGEN_HAVE_DOT@
 
 # The DOT_NUM_THREADS specifies the number of dot invocations doxygen is
 # allowed to run in parallel. When set to 0 (the default) doxygen will
-- 
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