warning with cmake 2.8.12.2:Argument not separated from preceding token by whitespace

[dpinol]

When compiling a dry package with cmake 2.8.12.2, I get this warning
You can try it with: https://github.com/dpinol/ros_tests/tree/master/cmake_policy

The fix consists in quoting the second argument of the add_custom_target call (escaping the echo's quotes)

~/svn/catkin_ws/ros_tests/cmake_policy$ make
mkdir -p bin
cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=/opt/ros/hydro/share/ros/core/rosbuild/rostoolchain.cmake  ..
-- The C compiler identification is GNU 4.6.3
-- The CXX compiler identification is GNU 4.6.3
-- Check for working C compiler: /home/dani/bin/cc
-- Check for working C compiler: /home/dani/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /home/dani/branches_svn/scm/bin/utils/developer_utils/g++
-- Check for working CXX compiler: /home/dani/branches_svn/scm/bin/utils/developer_utils/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found PythonInterp: /usr/bin/python (found version "2.7.3") 
CMake Warning (dev) at /opt/ros/hydro/share/ros/core/rosbuild/rosbuild.cmake:40 (include):
  Syntax Warning in cmake code at

    /opt/ros/hydro/share/ros/core/rosbuild/public.cmake:330:140

  Argument not separated from preceding token by whitespace.
Call Stack (most recent call first):
  CMakeLists.txt:2 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

[rosbuild] Building package cmake_policy

[dirk-thomas]

Moved to ros/ros#44.