[libc++] Check clang-tidy version

Reviewed By: ldionne, #libc

Spies: libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D120087

libcxx/utils/libcxx/test/dsl.py

@@ -217,6 +217,21 @@ def runScriptExitCode(config, script):
     _, _, exitCode, _ = _executeScriptInternal(test, script)
     return exitCode
 
+@_memoizeExpensiveOperation(lambda c, s: (c.substitutions, c.environment, s))
+def commandOutput(config, command):
+  """
+  Runs the given script as a Lit test, and returns the output.
+  If the exit code isn't 0 an exception is raised.
+
+  The script must be a list of commands, each of which being something that
+  could appear on the right-hand-side of a `RUN:` keyword.
+  """
+  with _makeConfigTest(config) as test:
+    out, _, exitCode, _ = _executeScriptInternal(test, command)
+    if exitCode != 0:
+     raise ConfigurationRuntimeError()
+    return out
+
 @_memoizeExpensiveOperation(lambda c, l: (c.substitutions, c.environment, l))
 def hasAnyLocale(config, locales):
   """

libcxx/utils/libcxx/test/features.py

@@ -18,6 +18,13 @@ _isGCC        = lambda cfg: '__GNUC__' in compilerMacros(cfg) and '__clang__' no
 _isMSVC       = lambda cfg: '_MSC_VER' in compilerMacros(cfg)
 _msvcVersion  = lambda cfg: (int(compilerMacros(cfg)['_MSC_VER']) // 100, int(compilerMacros(cfg)['_MSC_VER']) % 100)
 
+def _hasSuitableClangTidy(cfg):
+  try:
+    return int(re.search('[0-9]+', commandOutput(cfg, ['clang-tidy --version'])).group()) >= 13
+  except ConfigurationRuntimeError:
+    return False
+
+
 DEFAULT_FEATURES = [
   Feature(name='fcoroutines-ts',
           when=lambda cfg: hasCompileFlag(cfg, '-fcoroutines-ts') and
@@ -109,7 +116,7 @@ DEFAULT_FEATURES = [
   Feature(name='executor-has-no-bash',
           when=lambda cfg: runScriptExitCode(cfg, ['%{exec} bash -c \'bash --version\'']) != 0),
   Feature(name='has-clang-tidy',
-          when=lambda cfg: runScriptExitCode(cfg, ['clang-tidy --version']) == 0),
+          when=_hasSuitableClangTidy),
 
   Feature(name='apple-clang',                                                                                                      when=_isAppleClang),
   Feature(name=lambda cfg: 'apple-clang-{__clang_major__}'.format(**compilerMacros(cfg)),                                          when=_isAppleClang),