klibc - Oct 2005 - Re: [PATCH] Avoid using dc in git-count-objects

On Thu, Oct 27, 2005 at 10:22:08PM -0700, H. Peter Anvin
wrote:
>
> >So it looks like as long as dash can link with klibc then:
OK, I've got it to build with klibc using klcc:

$ size src/dash
   text    data     bss     dec     hex filename
  63333     356    5940   69629   10ffd src/dash

Unfortunately there seems to be something fishy in parameter expansion
as it fails three regression tests.  I need to look into it.

However, the good news is that it's smaller than I thought.  The above
result was actually obtained with klcc -static.  So the corresponding
size in klibc's ash is

$ size ash/sh
   text    data     bss     dec     hex filename
  77394     488   70936  148818   24552 ash/sh

In fact it could go even smaller since I only used -Os and not the
terribly long list of options that klibc uses :)

I haven't built a shared version of dash with klibc because klcc -shared
doesn't work very well with autoconf.

You can get the latest version at

http://gondor.apana.org.au/~herbert/dash/dash.git/

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

On Sat, Oct 29, 2005 at 10:29:53PM +1000, herbert wrote:
> 
> Unfortunately there seems to be something fishy in parameter expansion
> as it fails three regression tests.  I need to look into it.
OK, I've found the problem.  First two failures were harmless as klibc
doesn't have getpwnam so tilde expansion always fails.  The other one
was an off-by-one bug in my stpcpy code.

However, now I'm seeing bogus signal values being passed to my signal
handler.  I'm getting a signal value that's actually my PID.

I suspect this is somehow related to the sa_restorer code in klibc's
sigaction.  What's the i386 breakage that requires this sa_restorer
code? Does glibc do it as well?

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Herbert Xu wrote:
> On Thu, Oct 27, 2005 at 10:22:08PM -0700, H. Peter Anvin wrote:
> 
>>>So it looks like as long as dash can link with klibc then:
> 
> 
> OK, I've got it to build with klibc using klcc:
> 
> $ size src/dash
>    text    data     bss     dec     hex filename
>   63333     356    5940   69629   10ffd src/dash
> 
> Unfortunately there seems to be something fishy in parameter expansion
> as it fails three regression tests.  I need to look into it.
> 
> However, the good news is that it's smaller than I thought.  The above
> result was actually obtained with klcc -static.  So the corresponding
> size in klibc's ash is
> 
> $ size ash/sh
>    text    data     bss     dec     hex filename
>   77394     488   70936  148818   24552 ash/sh
> 
> In fact it could go even smaller since I only used -Os and not the
> terribly long list of options that klibc uses :)
> 
klcc will happily provide that terribly long list for you (including 
-Os), so you probably couldn't.

	-hpa

Hi Peter:

I've finally got around to putting dash into klibc and replacing ash
with it.  The result can be downloaded from

master.kernel.org:/pub/scm/linux/kernel/git/herbert/klibc.git

It passes all my regression tests apart from the exceptions that I've
noted previously due to klibc limitations (tilde expansion and ulimit).

Here are the sizes when built with gcc 4.0 on i386:

$ size dash/sh dash/sh.shared
   text    data     bss     dec     hex filename
  61553     324    5936   67813   108e5 dash/sh
  51500     256    5920   57676    e14c dash/sh.shared
$

There is still room for reduction as you can remove printf from either
utils/ or dash/.  IMHO it should be removed from utils/ since dash's
echo is simply a wrapper around printf.

I also haven't removed things like mail.c yet.  I will do another round
of removals soon.

Please let me know if you have any problems with it.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt