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Re: Skipping unexec via a big .elc file
From: |
Ken Raeburn |
Subject: |
Re: Skipping unexec via a big .elc file |
Date: |
Mon, 6 Feb 2017 10:20:59 -0500 |
And now I’ve got a *possible* explanation for why I’m seeing differences in
some .elc files.
It appears that the .elc output can vary depending on whether other loaded Lisp
code was compiled or not.
I found differences in diary-lib.elc between two of my build trees
(raeburn-startup branch, and the branch point). In the first function I looked
at, the differences came down to this:
335 constant (12 31 -1) constant (12 31 -1)
336 dup dup
337 varbind date varbind date
339 dup varbind date
340 varbind date constant (12 31 -1)
342 car car
343 unbind 1 unbind 1
The constant here comes from calendar-absolute-from-gregorian, a defsubst in
calendar.el. I tried with one source base (at the branch point), compiling
diary-lib.el with calendar.elc present, and again with calendar.elc missing so
that calendar.el would get used. The generated .elc files showed the same
differences.
This is arguably a bug, but not one added by the big-elc changes.
I almost always build with a make option like “-j4”, so the timing of byte
compilations of different files relative to one another isn’t entirely
predictable. This *could* account for a lot of differences I’m seeing. It’s
not a sure thing that this sort of thing is the only cause of differences; I’ll
have to do a fully serialized bootstrap of both versions of the code to see.
Ken
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/02
- Re: Skipping unexec via a big .elc file, Eli Zaretskii, 2017/02/04
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/05
- Re: Skipping unexec via a big .elc file, Eli Zaretskii, 2017/02/05
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/05
- Re: Skipping unexec via a big .elc file,
Ken Raeburn <=
- Re: Skipping unexec via a big .elc file, Stefan Monnier, 2017/02/06
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/06
- Re: Skipping unexec via a big .elc file, Stefan Monnier, 2017/02/06
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/08
- Re: Skipping unexec via a big .elc file, Ken Brown, 2017/02/08
- Re: Skipping unexec via a big .elc file, Ken Brown, 2017/02/05
- Re: Skipping unexec via a big .elc file, Eli Zaretskii, 2017/02/25
- Re: Skipping unexec via a big .elc file, Eli Zaretskii, 2017/02/25
- Re: Skipping unexec via a big .elc file, Ken Raeburn, 2017/02/26