cmake: Replace distutils.sysconfig with sysconfig

This commit replaces uses of distutils.sysconfig's get_python_lib()
function with sysconfig's near-equivalent get_path() function to get the
directory for site-specific, platform-specific files. Unfortunately,
get_path() does not have a way to easily modify or strip the prefix
applied to the path like get_python_lib() does, so the code must
manually modify the path to get the same effect:

- First, the platlib path is retrieved from the get_path() call.
- Next, the default base that is used to form the pathlib path is
queried via the get_config_var('base') call.
- Next, the portion of the platlib path that matches the default base is
stripped, and any leading path separator remaining is stripped. This
fundamentally replicates the behavior of get_python_lib() with an empty
prefix (i.e., the prefix positional parameter is specified as '').
- If a different prefix is desired, then the os.path.join() function is
used to combine the new prefix with the stripped pathlib path, ensuring
that the platform-specific path separator is used in crafting the path.

1 files changed, 4 insertions, 2 deletions

diff --git a/tools/gr-usrptest/cmake/Modules/GrPython.cmake b/tools/gr-usrptest/cmake/Modules/GrPython.cmake
index 9ac72c2d8..fdd1aff61 100644
--- a/tools/gr-usrptest/cmake/Modules/GrPython.cmake
+++ b/tools/gr-usrptest/cmake/Modules/GrPython.cmake
@@ -105,8 +105,10 @@ endmacro(GR_PYTHON_CHECK_MODULE)
 ########################################################################
 if(NOT DEFINED GR_PYTHON_DIR)
 execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "
-from distutils import sysconfig
-print sysconfig.get_python_lib(plat_specific=True, prefix='')
+import sysconfig
+platlib = sysconfig.get_path(name='platlib')
+base = sysconfig.get_config_var('base')
+print(platlib.replace(base, '').lstrip('/\\\\'))
 " OUTPUT_VARIABLE GR_PYTHON_DIR OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 endif()