[compiler-rt] [llvm] [lit] [compiler-rt] Add llvm-lit global command cache to speed up test config (PR #195888)

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darker --check --diff -r origin/main...HEAD compiler-rt/test/lit.common.cfg.py llvm/utils/lit/lit/util.py
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``````````diff
--- compiler-rt/test/lit.common.cfg.py	2026-05-05 17:38:31.000000 +0000
+++ compiler-rt/test/lit.common.cfg.py	2026-05-05 17:41:12.576272 +0000
@@ -579,11 +579,13 @@
     else:
         # There is no simulator-specific sw_vers/sysctl, so we use the host OS version
         os_detection_prefix = []
 
     darwin_os_version = lit.util.runCommandCached(
-        os_detection_prefix + ["sw_vers", "-productVersion"], universal_newlines=True, text=True
+        os_detection_prefix + ["sw_vers", "-productVersion"],
+        universal_newlines=True,
+        text=True,
     )
     darwin_os_version = tuple(int(x) for x in darwin_os_version.strip().split("."))
 
     if len(darwin_os_version) == 2:
         darwin_os_version = (darwin_os_version[0], darwin_os_version[1], 0)
@@ -941,11 +943,13 @@
     config.default_sanitizer_opts += ["abort_on_error=0"]
     config.default_sanitizer_opts += ["log_to_syslog=0"]
     if lit.util.which("log"):
         # Querying the log can only done by a privileged user so
         # so check if we can query the log.
-        res = lit.util.runCommandCached(["log", "show", "--last", "1m", "--predicate", "1 == 0"], allow_failure=True)
+        res = lit.util.runCommandCached(
+            ["log", "show", "--last", "1m", "--predicate", "1 == 0"], allow_failure=True
+        )
         if res is not None:
             config.available_features.add("darwin_log_cmd")
     else:
         lit_config.warning("log command not found. Some tests will be skipped.")
 elif config.android:
--- llvm/utils/lit/lit/util.py	2026-05-05 17:38:31.000000 +0000
+++ llvm/utils/lit/lit/util.py	2026-05-05 17:41:12.693762 +0000
@@ -440,10 +440,11 @@
                     pass
             psutilProc.kill()
         except psutil.NoSuchProcess:
             pass
 
+
 @functools.cache
 def _runCommandCachedInner(cmd, allow_failure, **kwargs):
     try:
         result = subprocess.run(
             cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=True, **kwargs
@@ -455,10 +456,11 @@
             lit_config.warning(msg)
         else:
             lit_config.fatal(msg)
         return None
 
+
 def runCommandCached(cmd, allow_failure=False, **kwargs):
     if type(cmd) is list:
         cmd = tuple(cmd)
     elif type(cmd) is str:
         cmd = tuple([cmd])

``````````

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https://github.com/llvm/llvm-project/pull/195888