On 6 October 2014 00:06, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
Il 02/10/2014 11:04, Zdenek Kabelac ha scritto:
> It used to give significant boost for automake & libtool based software
> - however at some point libtool started to use bashisms and so you
> cannot just replace /bin/sh -> dash - as build will fail.
This is wrong.
libtool detects whether you can use bashisms, and falls back to POSIX
shell constructs if it cannot use them. The non-POSIX constructs are
usually faster because they do not need to fork() the shell. Autoconf
does the same. dash rejects some of these constructs, and accept others.
Actually this might be the most important item in the whole conversation about moving to dash. If dash excepts some bashisms and not others... it isn't a 'default posix' shell and we really need someone to audit it and not expect that just because XYZ project uses it.. that they audited it. [And no this isn't a I want to keep bash as root shell argument, I don't really care what the default exec is as much as it is audited and secure. While it is clear that bash hasn't been that iwth only one maintainer.. I have no idea about dash and I am not sure who does.]
Stephen J Smoogen.
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