visualstudio: warning_level 0 should not map to /W1
In every other compilers level 0 maps to no argument at all.
@@ -114,7 +114,7 @@ class VisualStudioLikeCompiler(metaclass=abc.ABCMeta):
# See: https://ninja-build.org/manual.html#_deps
always_args = ['/nologo', '/showIncludes']
warn_args = {
- '0': ['/W1'],
+ '0': [],
'1': ['/W2'],
'2': ['/W3'],
'3': ['/W4'],
