Build: Implement hack for Cython 3.0.9 generated source file.

setup.py

@@ -422,6 +422,32 @@ def prepare_extensions(use_cython=True):
     if cythonize is not None:
         ext_modules = cythonize(ext_modules)
 
+        # Fix compiler warning due to missing pragma-push in Cython 3.0.9.
+        for ext in ext_modules:
+            for source_file in ext.sources:
+                if not os.path.basename(source_file).startswith('lua') or not source_file.endswith('.c'):
+                    continue
+                with open(source_file, 'rb') as f:
+                    lines = f.readlines()
+                if b'Generated by Cython 3.0.9' not in lines[0]:
+                    continue
+
+                modified = False
+                temp_file = source_file + ".tmp"
+                with open(temp_file, 'wb') as f:
+                    last_was_push = False
+                    for line in lines:
+                        if b'#pragma GCC diagnostic ignored "-Wincompatible-pointer-types"' in line and not last_was_push:
+                            f.write(b"#pragma GCC diagnostic push\n")
+                            modified = True
+                        last_was_push = b'#pragma GCC diagnostic push' in line
+                        f.write(line)
+                if modified:
+                    print("Fixed Cython 3.0.9 generated source file " + source_file)
+                    os.rename(temp_file, source_file)
+                else:
+                    os.unlink(temp_file)
+
     return ext_modules, ext_libraries