Patch cmake to allow detection of python 2.7.9+

[ADodds]

Summary

Some distributions of python have their version defined as follows in patchlevel.h (note the '+'):

#define PY_VERSION "2.7.9+"

The '+' char needs to be stripped by the cmake regex so that LLDBs python lib detection is successfull.

Note: \+ would have been nicer instead of [+] but that doesn't seem to be supported by CMake.

[zturner]

Where did you get this version of Python? I don't see anything wrong with this patch, but I'm a little curious what this + means

[krytarowski]

In D15566#311998, @zturner wrote:

Where did you get this version of Python? I don't see anything wrong with this patch, but I'm a little curious what this + means

I think a patched version. I don't know what vendor is changing Python's version. Perhaps good to stop doing it if it breaks software.

[ADodds]

Its currently present in the official 2.7.10 windows x64 python distro from python.org.

Its also present in some of the prebuilds I have been using from here:
http://p-nand-q.com/python/building-python-27-with-vs2010.html

I can only assume that perhaps it signifies that this is a x64 build as it doesnt seem to be present on x86 distros.

lldb/trunk/cmake/modules/LLDBConfig.cmake

if ("${PYTHON_HOME}" STREQUAL "")
     return()
   endif()
 
   file(TO_CMAKE_PATH "${PYTHON_HOME}/Include" PYTHON_INCLUDE_DIRS)
 
   if(EXISTS "${PYTHON_INCLUDE_DIRS}/patchlevel.h")
     file(STRINGS "${PYTHON_INCLUDE_DIRS}/patchlevel.h" python_version_str
          REGEX "^#define[ \t]+PY_VERSION[ \t]+\"[^\"]+\"")
-    string(REGEX REPLACE "^#define[ \t]+PY_VERSION[ \t]+\"([^\"]+)\".*" "\\1"
-                         PYTHONLIBS_VERSION_STRING "${python_version_str}")
+    string(REGEX REPLACE "^#define[ \t]+PY_VERSION[ \t]+\"([^\"+]+)[+]?\".*" "\\1"
     message("-- Found Python version ${PYTHONLIBS_VERSION_STRING}")
     string(REGEX REPLACE "([0-9]+)[.]([0-9]+)[.][0-9]+" "python\\1\\2" PYTHONLIBS_BASE_NAME "${PYTHONLIBS_VERSION_STRING}")
     unset(python_version_str)
   else()
     message("Unable to find ${PYTHON_INCLUDE_DIRS}/patchlevel.h, Python installation is corrupt.")
     message("Python support will be disabled for this build.")
     set(LLDB_DISABLE_PYTHON 1 PARENT_SCOPE)
     return()