anchor.diff:  cmake .. -DCMAKE_CXX_FLAGS="-DEX3"
   ----
   
  -[[set-default-flag]]
  -Set Default C++ Flags
  -^^^^^^^^^^^^^^^^^^^^^
  +## Set Default C++ Flags
   
   The default `CMAKE_CXX_FLAGS` is either empty or contains the appropriate flags
   for the build type.
  
positive.code: = Compile Flags
  
  :toc:
  :toc-placement!:
  
  toc::[]
  
  
  [[intro]]
  Introduction
  ------------
  
  CMake supports setting compile flags using the +CMAKE_C_FLAGS+ and +CMAKE_CXX_FLAGS+
  variables. Similarly linker flags can be set using the +CMAKE_LINKER_FLAGS+.
  
negative.code: For more details, see https://cmake.org/cmake/help/v3.0/command/set.html[here]
  ====
  
  # Building the Example
  
  [source,bash]
  ----
  