mlog: remove direct calls to log_once

This was never meant to be public API, log(once=True) is for that.

mesonbuild/compilers/c.py

@@ -484,10 +484,10 @@ class VisualStudioCCompiler(MSVCCompiler, VisualStudioLikeCCompilerMixin, CCompi
         args = []
         std = options[OptionKey('std', machine=self.for_machine, lang=self.language)]
         if std.value.startswith('gnu'):
-            mlog.log_once(
+            mlog.log(
                 'cl.exe does not actually support gnu standards, and meson '
                 'will instead demote to the nearest ISO C standard. This '
-                'may cause compilation to fail.')
+                'may cause compilation to fail.', once=True)
         # As of MVSC 16.8, /std:c11 and /std:c17 are the only valid C standard options.
         if std.value in {'c11', 'gnu1x', 'gnu11'}:
             args.append('/std:c11')
@@ -540,7 +540,7 @@ class IntelClCCompiler(IntelVisualStudioLikeCompiler, VisualStudioLikeCCompilerM
         key = OptionKey('std', machine=self.for_machine, lang=self.language)
         std = options[key]
         if std.value == 'c89':
-            mlog.log_once("ICL doesn't explicitly implement c89, setting the standard to 'none', which is close.")
+            mlog.log("ICL doesn't explicitly implement c89, setting the standard to 'none', which is close.", once=True)
         elif std.value != 'none':
             args.append('/Qstd:' + std.value)
         return args

mesonbuild/interpreter/interpreter.py

@@ -1497,7 +1497,7 @@ class Interpreter(InterpreterBase, HoldableObject):
                 try:
                     skip_sanity_check = self.should_skip_sanity_check(for_machine)
                     if skip_sanity_check:
-                        mlog.log_once('Cross compiler sanity tests disabled via the cross file.')
+                        mlog.log('Cross compiler sanity tests disabled via the cross file.', once=True)
                     comp = compilers.detect_compiler_for(self.environment, lang, for_machine, skip_sanity_check)
                     if comp is None:
                         raise InvalidArguments(f'Tried to use unknown language "{lang}".')

mesonbuild/mlog.py

@@ -268,7 +268,7 @@ def log(*args: TV_Loggable, is_error: bool = False,
         sep: T.Optional[str] = None,
         end: T.Optional[str] = None) -> None:
     if once:
-        log_once(*args, is_error=is_error, nested=nested, sep=sep, end=end)
+        _log_once(*args, is_error=is_error, nested=nested, sep=sep, end=end)
     else:
         _log(*args, is_error=is_error, nested=nested, sep=sep, end=end)
 
@@ -285,9 +285,9 @@ def _log(*args: TV_Loggable, is_error: bool = False,
     if not log_errors_only or is_error:
         force_print(*arr, nested=nested, sep=sep, end=end)
 
-def log_once(*args: TV_Loggable, is_error: bool = False,
+def _log_once(*args: TV_Loggable, is_error: bool = False,
-             nested: bool = True, sep: T.Optional[str] = None,
+              nested: bool = True, sep: T.Optional[str] = None,
-             end: T.Optional[str] = None) -> None:
+              end: T.Optional[str] = None) -> None:
     """Log variant that only prints a given message one time per meson invocation.
 
     This considers ansi decorated values by the values they wrap without