cmake: Deprecate CMake <3.17 support

docs/markdown/snippets/cmake_deprecation.md

@@ -0,0 +1,4 @@
+## CMake support for versions <3.17.0 is deprecated
+
+Support for CMake versions below 3.17.0 is now deprecated for *both* CMake
+dependencies and subprojects.

mesonbuild/cmake/interpreter.py

@@ -31,7 +31,6 @@ from functools import lru_cache
 from pathlib import Path
 import typing as T
 import re
-import textwrap
 from os import environ
 
 from ..mparser import (
@@ -824,17 +823,6 @@ class CMakeInterpreter:
 
         self.fileapi.setup_request()
 
-        if version_compare(cmake_exe.version(), '<3.17.0'):
-            mlog.warning(textwrap.dedent(f'''\
-                The minimum recommended CMake version is 3.17.0.
-                |
-                |   However, Meson was only able to find CMake {cmake_exe.version()} at {cmake_exe.cmakebin.command}.
-                |
-                |   Support for all CMake versions below 3.17.0 will be deprecated and
-                |   removed once newer CMake versions are more widely adopted. If you encounter
-                |   any errors please try upgrading CMake to a newer version first.
-            '''))
-
         # Run CMake
         mlog.log()
         with mlog.nested():

mesonbuild/cmake/traceparser.py

@@ -138,6 +138,17 @@ class CMakeTraceParser:
             'meson_ps_disabled_function': self._meson_ps_disabled_function,
         }  # type: T.Dict[str, T.Callable[[CMakeTraceLine], None]]
 
+        if version_compare(self.cmake_version, '<3.17.0'):
+            mlog.deprecation(textwrap.dedent(f'''\
+                CMake support for versions <3.17 is deprecated since Meson 0.62.0.
+                |
+                |   However, Meson was only able to find CMake {self.cmake_version}.
+                |
+                |   Support for all CMake versions below 3.17.0 will be removed once
+                |   newer CMake versions are more widely adopted. If you encounter
+                |   any errors please try upgrading CMake to a newer version first.
+            '''), once=True)
+
     def trace_args(self) -> T.List[str]:
         arg_map = {
             'human': ['--trace', '--trace-expand'],