GNU bug report logs - #40641
Building from git breaks when /bin/sh isn't bash

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From: elaexuotee <at> wilsonb.com
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: 40641 <at> debbugs.gnu.org, "pelzflorian \(Florian Pelz\)" <pelzflorian <at> pelzflorian.de>
Subject: bug#40641: Building from git breaks when /bin/sh isn't bash
Date: Sun, 10 Jul 2022 19:13:24 +0900

CONFIG_SHELL simply acts as a user override; it's not part of autoconf's core
logic. That role belongs to the SHELL macro, who's picks the first available of
the following:

- CONFIG_SHELL environment variable,
- SHELL environment variable, or
- /bin/sh

See autoconf's m4sugar/m4sh.m4 for the gory details. Arguably, this should
also be updated to point to a fixed /bin/sh output fallback.

Anyway, AM_SUBST_NOTMAKE([SHELL]), cf. '(automake) Optional', simply tells
automake to not define SHELL inside the generated Makefile. This means that
make will instead use it's default, which in our case is hard-coded to the
/bin/sh in its implicit bash-minimal dependency. For detailed info about this
behaviour of make, see '(make) Choosing the Shell'. Note, however, you will
have to do a mental sed-replace of "/bin/sh" with "<bash-minimal>/bin/sh" when
reading that page.


Cheers,
B.

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