Add dependencies.

CMakeLists.txt

@@ -43,7 +43,8 @@ if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/tinyformat/tinyformat_test.cpp)
     COMMAND @echo tinyformat timings:
     COMMAND @time -p ./tinyformat_speed_test tinyformat > /dev/null
     COMMAND @echo boost timings:
-    COMMAND @time -p ./tinyformat_speed_test boost > /dev/null)
+    COMMAND @time -p ./tinyformat_speed_test boost > /dev/null
+    DEPENDS tinyformat_speed_test)
 
   add_custom_target(bloat_test
     COMMAND echo running bloat tests...
@@ -57,5 +58,6 @@ if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/tinyformat/tinyformat_test.cpp)
     COMMAND ./bloat_test.sh -DUSE_TINYFORMAT
     COMMAND echo boost results:
     COMMAND ./bloat_test.sh -DUSE_BOOST
-    WORKING_DIRECTORY tinyformat)
+    WORKING_DIRECTORY tinyformat
+    DEPENDS format)
 endif ()