Add some cheap return and parameter annotations

Use: https://github.com/JelleZijlstra/autotyping
to add "safe" return annotations.

Where a parameter has a default value that is an obvious scalar type
(bool, int, str, etc.) add those annotations as well.

Also fixed two small bugs that popped up when sanity-checking with
mypy.  One in FortranCommon, where a return had been previously
annotated to be a tuple of Action, which should be ActionBase -
Action is the factory function, not the base class. The other was
a typo in the error raised in _add_cppdefines - the message was
formatted with the value of "define" which should have been "defines".

Signed-off-by: Mats Wichmann <mats@linux.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/SCons/Warnings.py b/SCons/Warnings.py
index f77a24a..5c2a0db 100644
--- a/SCons/Warnings.py
+++ b/SCons/Warnings.py
@@ -144,15 +144,15 @@ _warningAsException = False
 # If not None, a function to call with the warning
 _warningOut = None
 
-def suppressWarningClass(clazz):
+def suppressWarningClass(clazz) -> None:
     """Suppresses all warnings of type clazz or derived from clazz."""
     _enabled.insert(0, (clazz, False))
 
-def enableWarningClass(clazz):
+def enableWarningClass(clazz) -> None:
     """Enables all warnings of type clazz or derived from clazz."""
     _enabled.insert(0, (clazz, True))
 
-def warningAsException(flag=True):
+def warningAsException(flag: bool=True):
     """Set global _warningAsExeption flag.
 
     Args:
@@ -185,7 +185,7 @@ def warn(clazz, *args):
                     _warningOut(warning)
             break
 
-def process_warn_strings(arguments):
+def process_warn_strings(arguments) -> None:
     """Process requests to enable/disable warnings.
 
     The requests are strings passed to the --warn option or the