Added a build rule to generate compile_commands.json

tools/make/generate_compile_commands.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+import json
+import subprocess
+import os
+
+
+def is_source_file(filepath):
+    return filepath.endswith('.c') or filepath.endswith('.h') or filepath.endswith('.S')
+
+rootdir = os.getcwd()
+
+compile_db = []
+
+make_output = subprocess.check_output(['make', '-n']).decode('utf-8')
+
+make_output_lines = make_output.split('\n')
+
+for line in make_output_lines:
+    line_parts = line.split(' ')
+    new_line_parts = []
+
+    if 'gcc' not in line_parts[0]:
+        continue
+
+    src_file = ''
+    for part in line_parts:
+        part = part.strip()
+        if is_source_file(part):
+            src_file = part
+            part = '../{}'.format(part)
+
+        new_line_parts.append(part)
+
+    if len(src_file) == 0:
+        continue
+
+    db_entry = {
+            'directory': '{}/build'.format(rootdir),
+            'command': ' '.join(new_line_parts).strip(),
+            'file': '{}/{}'.format(rootdir, src_file)
+    }
+
+    compile_db.append(db_entry)
+
+os.system('make')
+
+out_file = open('build/compile_commands.json', 'w')
+json.dump(compile_db, out_file, indent=4)
+