Use setuptools_scm for dynamic versioning

.gitignore

@@ -92,3 +92,6 @@ Tests/images/sunraster
 
 # pyinstaller
 *.spec
+
+# Generated by setuptools_scm
+src/PIL/_version.py

pyproject.toml

@@ -2,6 +2,7 @@
 build-backend = "backend"
 requires = [
   "setuptools>=67.8",
+  "setuptools_scm>=8",
 ]
 backend-path = [
   "_custom_build",
@@ -86,6 +87,10 @@ package-dir = {"" = "src"}
 [tool.setuptools.dynamic]
 version = {attr = "PIL.__version__"}
 
+[tool.setuptools_scm]
+local_scheme = "no-local-version"
+version_file = "src/PIL/_version.py"
+
 [tool.cibuildwheel]
 before-all = ".github/workflows/wheels-dependencies.sh"
 build-verbosity = 1

setup.py

@@ -7,6 +7,7 @@
 # Final rating: 10/10
 # Your cheese is so fresh most people think it's a cream: Mascarpone
 # ------------------------------
+from __future__ import annotations
 
 import os
 import re
@@ -27,7 +28,6 @@ def get_version():
     return locals()["__version__"]
 
 
-PILLOW_VERSION = get_version()
 FREETYPE_ROOT = None
 HARFBUZZ_ROOT = None
 FRIBIDI_ROOT = None
@@ -44,7 +44,7 @@ def get_version():
 
     atexit.register(
         lambda: warnings.warn(
-            f"Pillow {PILLOW_VERSION} does not support Python "
+            f"Pillow {get_version()} does not support Python "
             f"{sys.version_info.major}.{sys.version_info.minor} and does not provide "
             "prebuilt Windows binaries. We do not recommend building from source on "
             "Windows.",
@@ -847,7 +847,7 @@ def build_extensions(self):
         if struct.unpack("h", b"\0\1")[0] == 1:
             defs.append(("WORDS_BIGENDIAN", None))
 
-        defs.append(("PILLOW_VERSION", f'"{PILLOW_VERSION}"'))
+        defs.append(("PILLOW_VERSION", f'"{get_version()}"'))
 
         self._update_extension("PIL._imaging", libs, defs)
 
@@ -912,7 +912,7 @@ def summary_report(self, feature):
         print("-" * 68)
         print("PIL SETUP SUMMARY")
         print("-" * 68)
-        print(f"version      Pillow {PILLOW_VERSION}")
+        print(f"version      Pillow {get_version()}")
         v = sys.version.split("[")
         print(f"platform     {sys.platform} {v[0].strip()}")
         for v in v[1:]:

src/PIL/Image.py

@@ -23,6 +23,7 @@
 #
 # See the README file for information on usage and redistribution.
 #
+from __future__ import annotations
 
 import atexit
 import builtins
@@ -81,7 +82,10 @@ class DecompressionBombError(Exception):
     # and should be considered private and subject to change.
     from . import _imaging as core
 
-    if __version__ != getattr(core, "PILLOW_VERSION", None):
+    # if __version__ != getattr(core, "PILLOW_VERSION", None):
+    if not hasattr(core, "PILLOW_VERSION") or re.sub(
+        "dev[0-9]+", "dev0", __version__
+    ) != re.sub("dev[0-9]+", "dev0", core.PILLOW_VERSION):
         msg = (
             "The _imaging extension was built for another version of Pillow or PIL:\n"
             f"Core version: {getattr(core, 'PILLOW_VERSION', None)}\n"