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Re: M4sh tests 77 and 78 vs /bin/sh -> dash

From: Michael Orlitzky
Subject: Re: M4sh tests 77 and 78 vs /bin/sh -> dash
Date: Thu, 12 Mar 2020 18:46:04 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2

On 3/12/20 4:53 PM, Zack Weinberg wrote:
> On further investigation, there is a concrete reason why autoconf 2.69
> prefers SHELL=/bin/bash to SHELL=/bin/dash, namely that dash doesn't
> support $LINENO, necessitating a complicated and fragile workaround

The $LINENO support in dash is configurable and enabled by default. You
have to disable it with ./configure --disable-lineno. Apparently, Debian
does so [0] to ensure that autoconf scripts with bashisms in them keep
working. In other words, they break dash just enough that bash will be
used as a fallback.


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