Enable --host_features=-compiler_param_file only when Bazel >= 6.1.0

This flag is only available in Bazel >= 6.1.0.

Author: kon72

refresh.template.py

@@ -96,6 +96,37 @@ def _print_header_finding_warning_once():
 _print_header_finding_warning_once.has_logged = False
 
 
+@functools.lru_cache(maxsize=None)
+def _get_bazel_version():
+    """Gets the Bazel version as a tuple of (major, minor, patch).
+
+    The rolling release and the release candidate are treated as the LTS release.
+    E.g. both 7.0.0-pre.XXXXXXXX.X and 7.0.0rc1 are treated as 7.0.0.
+    If the version can't be determined, returns (0, 0, 0).
+    """
+    bazel_version_process = subprocess.run(
+        ['bazel', 'version'],
+        # MIN_PY=3.7: Replace PIPEs with capture_output.
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding=locale.getpreferredencoding(),
+        check=True, # Should always succeed.
+    )
+
+    version = ''
+    for line in bazel_version_process.stdout.splitlines():
+        line = line.strip()
+        if line.startswith('Build label: '):
+            version = line[len('Build label: '):]
+
+    match = re.search(r'^(\d+)\.(\d+)\.(\d+)', version)
+    if not match:
+        log_warning(f">>> Failed to get Bazel version.\nPlease file an issue with the following log:\n", bazel_version_process.stdout)
+        return (0, 0, 0)
+
+    return tuple(int(match.group(i)) for i in range(1, 4))
+
+
 @functools.lru_cache(maxsize=None)
 def _get_bazel_cached_action_keys():
     """Gets the set of actionKeys cached in bazel-out."""
@@ -1165,13 +1196,17 @@ def _get_commands(target: str, flags: str):
         # That's all well and good, but param files would prevent us from seeing compile actions before the param files had been generated by compilation.
         # Since clangd has no such length limit, we'll disable param files for our aquery run.
         '--features=-compiler_param_file',
-        '--host_features=-compiler_param_file',
         # Disable layering_check during, because it causes large-scale dependence on generated module map files that prevent header extraction before their generation
             # For more context, see https://github.com/hedronvision/bazel-compile-commands-extractor/issues/83
             # If https://github.com/clangd/clangd/issues/123 is resolved and we're not doing header extraction, we could try removing this, checking that there aren't erroneous red squigglies squigglies before the module maps are generated.
             # If Bazel starts supporting modules (https://github.com/bazelbuild/bazel/issues/4005), we'll probably need to make changes that subsume this.
         '--features=-layering_check',
-    ] + additional_flags
+    ]
+
+    if _get_bazel_version() >= (6, 1, 0):
+        aquery_args += ['--host_features=-compiler_param_file']
+
+    aquery_args += additional_flags
 
     aquery_process = subprocess.run(
         aquery_args,