From dcad06c77ee5bc514d729d9a01c4d8a6f4fd5d21 Mon Sep 17 00:00:00 2001
From: Christian Rauch <Rauch.Christian@gmx.de>
Date: Sat, 19 Oct 2024 10:03:56 +0200
Subject: [PATCH] details about module search path on failure

---
 cmake/MakePythonWheel.cmake | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/cmake/MakePythonWheel.cmake b/cmake/MakePythonWheel.cmake
index 4579bf2b5..805669646 100644
--- a/cmake/MakePythonWheel.cmake
+++ b/cmake/MakePythonWheel.cmake
@@ -9,7 +9,19 @@ function( MakeWheel python_module)
     cmake_parse_arguments(MAKEWHEEL "PRINT_HELP" "MODULE;VERSION;SUMMARY;DESCRIPTION;HOMEPAGE;AUTHOR;EMAIL;LICENCE" "REQUIRES" ${ARGN} )
     set(version ${MAKEWHEEL_VERSION})
 
-    execute_process(COMMAND ${Python3_EXECUTABLE} -c "import setuptools" ERROR_QUIET RESULT_VARIABLE has_setuptools)
+    execute_process(
+        COMMAND ${Python3_EXECUTABLE} -c "
+import sys
+try:
+    import setuptools
+    sys.exit(0)
+except ImportError as e:
+    print(f'{e}. Search paths:', file=sys.stderr)
+    for p in sys.path: print(f'  {p}', file=sys.stderr)
+    sys.exit(1)
+"
+    ERROR_QUIET RESULT_VARIABLE has_setuptools)
+
     if(has_setuptools EQUAL "1")
         message(FATAL_ERROR "Python module `setuptools` required for correct wheel filename generation.")
     endif()