[llvm] [Runtimes] Merge 'compile_commands.json' files from runtimes build (PR #116303)

[Shilei Tian via llvm-commits]

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@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+"""A command line utility to merge two JSON files.
+
+This is a python program that merges two JSON files into a single one. The 
+intended use for this is to combine generated 'compile_commands.json' files
+created by CMake when performing an LLVM runtime build.
+"""
+
+import argparse
+import json
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "-o", type=str,
+        help="The output file to write JSON data to",
+        default=None, nargs="?",
+    )
+    parser.add_argument(
+        "json_files", type=str, nargs='+', help="Input JSON files to merge"
+    )
+    args = parser.parse_args()
+
+    merged_data = []
+    
+    for json_file in args.json_files:
+        try:
+            with open(json_file, 'r') as f:
+                data = json.load(f)
+                merged_data.extend(data)
+        except (IOError, json.JSONDecodeError):
+            continue
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shiltian wrote:

probably drop a warning or so here

https://github.com/llvm/llvm-project/pull/116303