[libc-commits] [libc] [libc] Revamp hdrgen command line and build integration (PR #121522)

[Petr Hosek via libc-commits]

================
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+#
+# ===- Generate headers for libc functions  ------------------*- python -*--==#
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ==------------------------------------------------------------------------==#
+
+import argparse
+import sys
+from pathlib import Path
+
+from header import HeaderFile
+from yaml_to_classes import load_yaml_file, fill_public_api
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Generate header files from YAML")
+    parser.add_argument(
+        "yaml_file",
+        help="Path to the YAML file containing header specification",
+        metavar="FILE",
+        type=Path,
+        nargs=1,
+    )
+    parser.add_argument(
+        "-o",
+        "--output",
+        help="Path to write generated header file",
+        type=Path,
+        required=True,
+    )
+    parser.add_argument(
+        "--depfile",
+        help="Path to write a depfile",
+        type=Path,
+    )
+    parser.add_argument(
+        "-e",
+        "--entry-point",
+        help="Entry point to include; may be given many times",
+        metavar="SYMBOL",
+        action="append",
+    )
+    args = parser.parse_args()
+
+    [yaml_file] = args.yaml_file
+    files_read = {yaml_file}
+
+    def write_depfile():
+        if not args.depfile:
+            return
+        deps = " ".join(str(f) for f in sorted(files_read))
+        args.depfile.parent.mkdir(parents=True, exist_ok=True)
+        with open(args.depfile, "w") as depfile:
+            depfile.write(f"{args.output}: {deps}\n")
+
+    header = load_yaml_file(yaml_file, HeaderFile, args.entry_point)
+
+    if not header.template_file:
+        sys.stderr.write(f"{yaml_file}: Missing header_template\n")
----------------
petrhosek wrote:

I prefer the following:
```suggestion
        print(f"{yaml_file}: Missing header_template\n", file=sys.stderr)
```

https://github.com/llvm/llvm-project/pull/121522