Increment the environment version to resolve C domain issues on incremental rebuilds (#12583)

Author: AA-Turner

CHANGES.rst

@@ -4,6 +4,9 @@ Release 7.4.2 (in development)
 Bugs fixed
 ----------
 
+* #12580, #12583: Resolve failures with the C domain on incremental builds
+  with Sphinx 7.3.7 and earlier.
+  Patch by Adam Turner.
 
 Release 7.4.1 (released Jul 15, 2024)
 =====================================

sphinx/environment/__init__.py

@@ -59,7 +59,7 @@
 
 # This is increased every time an environment attribute is added
 # or changed to properly invalidate pickle files.
-ENV_VERSION = 61
+ENV_VERSION = 62
 
 # config status
 CONFIG_UNSET = -1

tests/js/fixtures/cpp/searchindex.js

@@ -34,6 +34,6 @@ def build(srcdir: Path) -> None:
     print('done')
 
     print(f'Copying {searchindex} to {destination} ... ', end='')
-    destination.parent.mkdir(exist_ok=True)
+    destination.parent.mkdir(exist_ok=True, parents=True)
     shutil.copy2(searchindex, destination)
     print('done')