linux-kernel - Re: [PATCH 2/2] kbuild: add shell cache

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Message-ID: <CA+r1ZhgE3PHYU9N8yE3R2-=n7QzgApVGqueKQ8QqvQD1tj-X9A@mail.gmail.com>
Date:	Wed, 29 Jun 2016 09:57:02 -0700
From:	Jim Davis <jim.epost@...il.com>
To:	Rabin Vincent <rabin@....in>
Cc:	mmarek@...e.com, linux-kbuild@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] kbuild: add shell cache

On Mon, Jun 27, 2016 at 11:28 AM, Rabin Vincent <rabin@....in> wrote:
> Running make results in over 40 invocations of the compiler just during
> processing of the Makefile, before any actual rules are run.
>
> To reduce this overhead, cache the results of $(shell) calls to the
> compiler.

Clever.   Looks like lisp with all those parens!

One quirk with distclean:

jim@...bstar:~/linux-rc$ make defconfig >/dev/null
jim@...bstar:~/linux-rc$ ls -la .shellcache
-rw-rw-r-- 1 jim jim 7876 Jun 29 09:51 .shellcache
jim@...bstar:~/linux-rc$ make distclean | grep '\.shellcache'
  CLEAN   .shellcache
jim@...bstar:~/linux-rc$ ls -la .shellcache
-rw-rw-r-- 1 jim jim 1061 Jun 29 09:52 .shellcache

-- 
Jim