From 78aecc266be62dc59cda92075643e39812d6684c Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Mon, 30 Oct 2023 16:45:24 +0100
Subject: [PATCH] python: bring python 2 support back

It was removed in #624, but ROS-CI still needs it.
---
 python.cmake | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/python.cmake b/python.cmake
index cc043ddf7..66fe299fa 100644
--- a/python.cmake
+++ b/python.cmake
@@ -144,9 +144,16 @@ macro(FINDPYTHON)
 
       # Provide some hints according to the current PYTHON_EXECUTABLE
       if(NOT DEFINED PYTHON_INCLUDE_DIR)
+        if(_PYTHON_VERSION_MAJOR EQUAL "2")
+          set(PYTHON_INCLUDE_DIR_CMD
+              "import distutils.sysconfig as sysconfig; print(sysconfig.get_python_inc())"
+          )
+        else()
+          set(PYTHON_INCLUDE_DIR_CMD
+              "import sysconfig; print(sysconfig.get_path('include'))")
+        endif()
         execute_process(
-          COMMAND "${PYTHON_EXECUTABLE}" "-c"
-                  "import sysconfig; print(sysconfig.get_path('include'))"
+          COMMAND "${PYTHON_EXECUTABLE}" "-c" ${PYTHON_INCLUDE_DIR_CMD}
           OUTPUT_VARIABLE PYTHON_INCLUDE_DIR
           ERROR_QUIET)
         string(STRIP "${PYTHON_INCLUDE_DIR}" PYTHON_INCLUDE_DIR)
@@ -215,9 +222,16 @@ macro(FINDPYTHON)
       # Retrieve the corresponding value of PYTHON_INCLUDE_DIR if it is not
       # defined
       if(NOT DEFINED PYTHON_INCLUDE_DIR)
+        if(_PYTHON_VERSION_MAJOR EQUAL "2")
+          set(PYTHON_INCLUDE_DIR_CMD
+              "import distutils.sysconfig as sysconfig; print(sysconfig.get_python_inc())"
+          )
+        else()
+          set(PYTHON_INCLUDE_DIR_CMD
+              "import sysconfig; print(sysconfig.get_path('include'))")
+        endif()
         execute_process(
-          COMMAND "${PYTHON_EXECUTABLE}" "-c"
-                  "import sysconfig; print(sysconfig.get_path('include'))"
+          COMMAND "${PYTHON_EXECUTABLE}" "-c" ${PYTHON_INCLUDE_DIR_CMD}
           OUTPUT_VARIABLE PYTHON_INCLUDE_DIR
           ERROR_QUIET)
         string(STRIP "${PYTHON_INCLUDE_DIR}" PYTHON_INCLUDE_DIR)
@@ -269,9 +283,15 @@ macro(FINDPYTHON)
           "import sys, os; print(os.sep.join(['lib', 'python' + '.'.join(sys.version.split('.')[:2]), 'site-packages']))"
       )
     else(PYTHON_STANDARD_LAYOUT)
-      set(PYTHON_SITELIB_CMD
-          "import sysconfig; from pathlib import Path; print(Path(sysconfig.get_path('purelib')).relative_to(sysconfig.get_path('data')))"
-      )
+      if(_PYTHON_VERSION_MAJOR EQUAL "2")
+        set(PYTHON_SITELIB_CMD
+            "from distutils import sysconfig; print(sysconfig.get_python_lib(prefix='', plat_specific=False))"
+        )
+      else()
+        set(PYTHON_SITELIB_CMD
+            "import sysconfig; from pathlib import Path; print(Path(sysconfig.get_path('purelib')).relative_to(sysconfig.get_path('data')))"
+        )
+      endif()
     endif(PYTHON_STANDARD_LAYOUT)
 
     execute_process(