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From:	Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
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Date:	Mon, 4 Apr 2016 01:09:41 -0500
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On 2016-04-03 18:05, Andrey Repin wrote:
> Because, within my reach, Cygwin is the only system that not using DASH as
> /bin/sh. Though, I may try rolling some busybox…

There *is* a world outside of Debian/Ubuntu; Fedora, RHEL/CentOS, and 
Arch Linux all use bash for /bin/sh.  However, a simple test in the form 
of building GCC with dash as /bin/sh, while noticeably faster, showed 
that Debian/Ubuntu have yet to fully upstream their work 
("gcc/genmultilib: 261: shift: can't shift that many").

As much as the speed difference is promising (and frankly tempting), I'm 
afraid we simply don't have the resources to fix everything to work with 
dash as /bin/sh.

-- 
Yaakov

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