Re: [Emacs-diffs] trunk r116889: Require GNU make to build Emacs

[Paul Eggert]

On 03/27/2014 01:05 PM, Daniel Colascione wrote:
> Can we also require a reasonable POSIX shell and simplify configure.ac?

This should be acceptable nowadays, since 'configure' is pretty good 
about finding a POSIX-compatible shell first thing, and it reexecutes 
itself with such a file if it finds one. If we're careful about using 
'$(SHELL)' rather than 'sh' elsewhere, we should be able to use POSIX 
features in other shell scripts too.

We should be able to use shell functions, for example. However, we can't 
assume every niggling feature required by POSIX.For details, please see 
the Autoconf manual's chapter on portable shell programming, e.g., its 
section on shell functions.

http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Portable-Shell.html