Added test for the dtrace program and enables its use if found

Author: tachoknight

CMakeLists.txt

@@ -67,7 +67,12 @@ endif()
 if(CMAKE_SYSTEM_NAME STREQUAL Android)
  set(ENABLE_DTRACE_DEFAULT OFF)
 else()
- set(ENABLE_DTRACE_DEFAULT ON)
+ find_program(DTRACEPROG dtrace)
+ if(DTRACEPROG)
+ set(ENABLE_DTRACE_DEFAULT ON)
+ else()
+ set(ENABLE_DTRACE_DEFAULT OFF)
+ endif()
 endif()
 option(ENABLE_DTRACE "enable dtrace support" ${ENABLE_DTRACE_DEFAULT})