Better diagnostics for non-working cygdb installations. (GH-3489)

If your installation is faulty, cygdb will now print the filepath of the code that caused an exception, and the path of the python interpreter will be printed for better debugging.

1 files changed, 19 insertions, 13 deletions

diff --git a/Cython/Debugger/Cygdb.py b/Cython/Debugger/Cygdb.py
index 45f31ce6f..1b0a794e3 100644
--- a/Cython/Debugger/Cygdb.py
+++ b/Cython/Debugger/Cygdb.py
@@ -45,17 +45,23 @@ def make_command_file(path_to_debug_info, prefix_code='', no_import=False):
             set print pretty on
 
             python
-            # Activate virtualenv, if we were launched from one
-            import os
-            virtualenv = os.getenv('VIRTUAL_ENV')
-            if virtualenv:
-                path_to_activate_this_py = os.path.join(virtualenv, 'bin', 'activate_this.py')
-                print("gdb command file: Activating virtualenv: %s; path_to_activate_this_py: %s" % (
-                    virtualenv, path_to_activate_this_py))
-                with open(path_to_activate_this_py) as f:
-                    exec(f.read(), dict(__file__=path_to_activate_this_py))
-
-            from Cython.Debugger import libcython, libpython
+            try:
+                # Activate virtualenv, if we were launched from one
+                import os
+                virtualenv = os.getenv('VIRTUAL_ENV')
+                if virtualenv:
+                    path_to_activate_this_py = os.path.join(virtualenv, 'bin', 'activate_this.py')
+                    print("gdb command file: Activating virtualenv: %s; path_to_activate_this_py: %s" % (
+                        virtualenv, path_to_activate_this_py))
+                    with open(path_to_activate_this_py) as f:
+                        exec(f.read(), dict(__file__=path_to_activate_this_py))
+                from Cython.Debugger import libcython, libpython
+            except Exception as ex:
+                from traceback import print_exc
+                print("There was an error in Python code originating from the file ''' + str(__file__) + '''")
+                print("It used the Python interpreter " + str(sys.executable))
+                print_exc()
+                exit(1)
             end
             '''))
 
@@ -79,8 +85,8 @@ def make_command_file(path_to_debug_info, prefix_code='', no_import=False):
                     gdb.lookup_type('PyModuleObject')
                 except RuntimeError:
                     sys.stderr.write(
-                        'Python was not compiled with debug symbols (or it was '
-                        'stripped). Some functionality may not work (properly).\\n')
+                        "''' + interpreter + ''' was not compiled with debug symbols (or it was "
+                        "stripped). Some functionality may not work (properly).\\n")
                 end
 
                 source .cygdbinit