Add a notice about Python 3.5 support

This will be printed in bold at the end of interactive meson
sub-commands that won't be parsed by a program. Specifically: setup,
compile, test, and install.

NOTICE: You are using [...]

1 files changed, 7 insertions, 2 deletions

diff --git a/mesonbuild/mlog.py b/mesonbuild/mlog.py
index 1e5a105..9c19427 100644
--- a/mesonbuild/mlog.py
+++ b/mesonbuild/mlog.py
@@ -255,8 +255,10 @@ def _log_error(severity: str, *rargs: T.Union[str, AnsiDecorator],
 
     # The typing requirements here are non-obvious. Lists are invariant,
     # therefore T.List[A] and T.List[T.Union[A, B]] are not able to be joined
-    if severity == 'warning':
-        label = [yellow('WARNING:')]  # type: T.List[T.Union[str, AnsiDecorator]]
+    if severity == 'notice':
+        label = [bold('NOTICE:')]  # type: T.List[T.Union[str, AnsiDecorator]]
+    elif severity == 'warning':
+        label = [yellow('WARNING:')]
     elif severity == 'error':
         label = [red('ERROR:')]
     elif severity == 'deprecation':
@@ -295,6 +297,9 @@ def warning(*args: T.Union[str, AnsiDecorator], **kwargs: T.Any) -> None:
 def deprecation(*args: T.Union[str, AnsiDecorator], **kwargs: T.Any) -> None:
     return _log_error('deprecation', *args, **kwargs, is_error=True)
 
+def notice(*args: T.Union[str, AnsiDecorator], **kwargs: T.Any) -> None:
+    return _log_error('notice', *args, **kwargs, is_error=False)
+
 def get_relative_path(target: Path, current: Path) -> Path:
     """Get the path to target from current"""
     # Go up "current" until we find a common ancestor to target