diff --git a/bootstrap.egg-info/entry_points.txt b/bootstrap.egg-info/entry_points.txt
index a21ca22709..c84c0e8ab9 100644
--- a/bootstrap.egg-info/entry_points.txt
+++ b/bootstrap.egg-info/entry_points.txt
@@ -1,5 +1,6 @@
 [distutils.commands]
 egg_info = setuptools.command.egg_info:egg_info
+dist_info = setuptools.command.dist_info:dist_info
 build_py = setuptools.command.build_py:build_py
 sdist = setuptools.command.sdist:sdist
 editable_wheel = setuptools.command.editable_wheel:editable_wheel
diff --git a/newsfragments/4973.feature.rst b/newsfragments/4973.feature.rst
new file mode 100644
index 0000000000..e88c7db29f
--- /dev/null
+++ b/newsfragments/4973.feature.rst
@@ -0,0 +1,2 @@
+PEP 517 ``get_requires_for_build_sdist`` and ``get_requires_for_build_wheel`` hooks
+now terminate as soon as it is determined there are no extra build dependencies.
diff --git a/setuptools/__init__.py b/setuptools/__init__.py
index f1b9bfe9b8..f75a78f5bb 100644
--- a/setuptools/__init__.py
+++ b/setuptools/__init__.py
@@ -83,8 +83,11 @@ def finalize_options(self):
 
     # Honor setup.cfg's options.
     dist.parse_config_files(ignore_option_errors=True)
-    if dist.setup_requires:
-        _fetch_build_eggs(dist)
+    # NOTE: fetch_build_eggs is called so even if there are no build
+    # requirements, get_requires_for_build_(sdist/wheel) will still
+    # short-circuit once build dependencies are known (avoiding the
+    # costly full execution of setup.py).
+    _fetch_build_eggs(dist)
 
 
 def _fetch_build_eggs(dist: Distribution):