[Discuss-gnuradio] Problem compiling gnuradio 3.7.0 on CentOS 6.2

[Robert Lucas]

My system:
CentOS 6.2, x86_64
Python 2.6.6
Cmake version 2.6-patch 4
gnuradio 3.7.0

I created a "build" folder in the gnuradio soure directory and attempted to 
compile using "cmake ../".  The error I keep getting is this:

--------------------------------------------START 
LOG-------------------------------------------------------------
-- Build type not specified: defaulting to release.
-- NO PERF COUNTERS
-- Minimum SWIG version required is 1.3.31
-- 
-- The build system will automatically enable all components.
-- Use -DENABLE_DEFAULT=OFF to disable components by default.
-- 
-- Configuring python-support support...
--   Dependency PYTHONLIBS_FOUND = TRUE
--   Dependency SWIG_FOUND = 1
--   Dependency SWIG_VERSION_CHECK = TRUE
--   Enabling python-support support.
--   Override with -DENABLE_PYTHON=ON/OFF
-- 
-- Configuring testing-support support...
--   Dependency CPPUNIT_FOUND = TRUE
--   Enabling testing-support support.
--   Override with -DENABLE_TESTING=ON/OFF
-- 
-- Configuring volk support...
--   Enabling volk support.
--   Override with -DENABLE_VOLK=ON/OFF
  File "<string>", line 1
    

    ^
SyntaxError: invalid syntax
CMake Error at volk/cmake/GrPython.cmake:105 (file):
  file FILE(SYSTEM_PATH ENV result) must be called with only three arguments.
Call Stack (most recent call first):
  volk/CMakeLists.txt:53 (include)


-- 
-- Python checking for python >= 2.5
  File "<string>", line 1
    

    ^
SyntaxError: invalid syntax
-- Python checking for python >= 2.5 - not found
-- 
-------------------------------------------END 
LOG-------------------------------------------------------------

It seems as if cmake is inserting a "CR" character at the beginning of each 
string that is passed to python.  

I found that I was able to resolve the problem by editing 
volk/cmake/GrPython.cmake to put all the python code on one line as follows:

----------------------ORIGINAL CODE----------------------------------
########################################################################
# Sets the python installation directory GR_PYTHON_DIR
########################################################################
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "
from distutils import sysconfig
print sysconfig.get_python_lib(plat_specific=True, prefix='')
" OUTPUT_VARIABLE GR_PYTHON_DIR OUTPUT_STRIP_TRAILING_WHITESPACE
)
file(TO_CMAKE_PATH ${GR_PYTHON_DIR} GR_PYTHON_DIR)

----------------------------EDITED CODE----------------------------------
########################################################################
# Sets the python installation directory GR_PYTHON_DIR
########################################################################
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "from distutils import 
sysconfig; print sysconfig.get_python_lib(plat_specific=True, prefix='');" 
OUTPUT_VARIABLE GR_PYTHON_DIR OUTPUT_STRIP_TRAILING_WHITESPACE
)
file(TO_CMAKE_PATH ${GR_PYTHON_DIR} GR_PYTHON_DIR)

--------------------------END 
CODE-----------------------------------------------

Note that trying to put "from distutils import sysconfig" on the same line as 
the open quotemark does not resolve the problem either (it also seems to append 
a CR to the end of the line and python barks at me).  

However, this process is very tedious, and it seems like there should be a 
better way of fixing it, and it does not work for the sections of python code 
in the cmake files where there are if/else blocks.  Is there a better way of 
resolving this problem, or has anyone else had this problem?