Commit 8a685db3 authored Aug 22, 2020 by Masahiro Yamada

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 <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>

parent 23cd88c9

scripts/gen_compile_commands.py

+2 −5

Original line number	Diff line number	Diff line
		@@ -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))

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