linux-kernel - Re: [PATCH v4] tags: much faster, parallel "make tags"

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Message-ID: <55D483D4.5020905@suse.cz>
Date:	Wed, 19 Aug 2015 15:25:40 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Pádraig Brady <P@...igBrady.com>
Subject: Re: [PATCH v4] tags: much faster, parallel "make tags"

On 2015-05-11 22:25, Alexey Dobriyan wrote:
> ctags is single-threaded program. Split list of files to be tagged into
> almost equal parts, process them on every CPU and merge the results.

Sorry, I missed the v4 of the patch.


> +	# Remove headers.
> +	for i in .make-tags.t*; do
> +		sed -i -e '/^!/d' $i
> +	done
> +
> +	# Write final header.
> +	$1 -f $2 /dev/null
> +
> +	# Append sorted results.
> +	sort .make-tags.t* >>$2
> +	rm -f .make-tags.t*

This still breaks Exuberant ctags in emacs mode:
$ ln -s /usr/bin/ctags ~/bin/etags
$ make TAGS
  GEN     TAGS
etags: "TAGS" doesn't look like a tag file; I refuse to overwrite it.
etags: "TAGS" doesn't look like a tag file; I refuse to overwrite it.

The TAGS file is corrupted because of the sorting.

Michal
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