Subject: bug#34448: --no-build-details means system-name is nil

From: Glenn Morris <[email-masked]>
Date: Mon, 11 Feb 2019 20:54:32 -0500

Package: emacs
Version: 27.0.50
Severity: minor

Master at revision 2860f6cec5. If I run

emacs -Q --no-build-details

then (system-name) returns nil. I expect this switch to only affect the
values stored in the Emacs binary, not the run-time result.

I'm also not sure why --no-build-details is a run-time option (as
opposed to a build-time one).

Anyway, this breaks file-locking (cf bug#34355) and makes it impossible
to save a file.