From: Masahiro Yamada Date: Sat, 22 Aug 2020 14:56:09 +0000 (+0900) Subject: gen_compile_commands: parse only the first line of .*.cmd files X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8a685db32f2b3495c91efab6e9462c2fd934778f;p=linux.git gen_compile_commands: parse only the first line of .*.cmd files After the allmodconfig build, this script takes about 5 sec on my machine. Most of the run-time is consumed for needless regex matching. We know the format of .*.cmd file; the first line is the build command. There is no need to parse the rest. With this optimization, now it runs 4 times faster. Signed-off-by: Masahiro Yamada Reviewed-by: Nick Desaulniers Tested-by: Nick Desaulniers --- diff --git a/scripts/gen_compile_commands.py b/scripts/gen_compile_commands.py index c458696ef3a79..1bcf33a93cb93 100755 --- a/scripts/gen_compile_commands.py +++ b/scripts/gen_compile_commands.py @@ -125,11 +125,8 @@ def main(): filepath = os.path.join(dirpath, filename) with open(filepath, 'rt') as f: - for line in f: - result = line_matcher.match(line) - if not result: - continue - + result = line_matcher.match(f.readline()) + if result: try: entry = process_line(directory, dirpath, result.group(1), result.group(2))