make graphviz optional

Author: jeronstone

CMakeGraphVizOptions.cmake

@@ -1,2 +1,2 @@
 set(GRAPHVIZ_GENERATE_PER_TARGET TRUE)
-set(GRAPHVIZ_IGNORE_TARGETS test_* unity)
+set(GRAPHVIZ_IGNORE_TARGETS test_* unity gcov)

CMakeLists.txt

@@ -29,6 +29,7 @@ option(BUILD_TESTING "Enable building unit tests" OFF)
 option(TEST_MEMCHECK "Enable test runtime memory checking" OFF)
 option(TEST_COVERAGE "Enable test runtime coverage logging" OFF)
 option(BUILD_PACKAGE "Enable building package outputs" OFF)
+option(GENERATE_GRAPHVIZ "Generate a dependency graph via Graphviz" OFF)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
@@ -199,8 +200,10 @@ if(BUILD_PACKAGE)
     add_subdirectory(pkg)
 endif(BUILD_PACKAGE)
 
-add_custom_target(graphviz ALL
-    COMMAND ${CMAKE_COMMAND} "--graphviz=dep_chart.dot" .
-    COMMAND dot -Tpng dep_chart.dot -o dep_chart.png
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-)
+if(GENERATE_GRAPHVIZ)
+  add_custom_target(graphviz ALL
+      COMMAND ${CMAKE_COMMAND} "--graphviz=dep_chart.dot" .
+      COMMAND dot -Tpng dep_chart.dot -o dep_chart.png
+      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+  )
+endif(GENERATE_GRAPHVIZ)