From: "Daniel Colascione" <dancol@dancol.org>
To: "Paul Eggert" <eggert@cs.ucla.edu>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: CHECK_STRUCTS/dmpstruct.h mechanism is broken.
Date: Thu, 11 Apr 2019 15:26:25 -0700 [thread overview]
Message-ID: <7aad2945b0e66330aaeffba79edc87a1.squirrel@dancol.org> (raw)
In-Reply-To: <93b861b3-41d2-e590-d4b8-46a4bb64bfe8@cs.ucla.edu>
> On 4/11/19 12:15 PM, Eli Zaretskii wrote:
>> You want to test for system-dependent features with Make? How does
>> one do that?
>
> You execute the test as a 'make' rule that records the test's result as
> a makefile snippet (or as a .h file, or whatever).
>
>> Wouldn't we end up with heaps of Make wizardry only a few understand?
> Sure, just as we now have heaps of .m4 and shell etc. wizardry that only
> a few understand. (Think of it as the law of conservation of wizardry.
> :-) However, an advantage of using Make instead of M4 is that we already
> need to use Make anyway, so avoiding m4 means one less thing for
> developers to learn. Another advantage is that Make can easily run in
> parallel whereas 'configure' does not.
>
>> IME, the slowest part is byte compilation of Lisp files. Of course,
>> that is only a significant factor when you bootstrap or rebuild large
>> parts of Emacs, but still.
> Yes. Typically I don't recompile Lisp files so the bottleneck for me is
> 'configure'.
>
> Moreover, Lisp file recompilation is parallelized so it's reasonably
> fast on larger platforms (the wave of the future :-), whereas
> 'configure' will remain slow. I just now timed it, and './configure'
> took 29 real-time seconds whereas 'cd lisp; make -j16 compile-always'
> took 38 real-time seconds; this was with two circa-2013 Xeon E5-2640 v2
> CPUs with 8 cores each. So on a 32-core platform, I expect ./configure
> to take longer than byte-compiling all the Lisp files - i.e.,
> 'configure' is ridiculously slow.
caching is supposed to help with that, isn't it?
next prev parent reply other threads:[~2019-04-11 22:26 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 20:21 CHECK_STRUCTS/dmpstruct.h mechanism is broken Alan Mackenzie
2019-02-28 20:55 ` Eli Zaretskii
2019-02-28 20:59 ` Alan Mackenzie
2019-03-01 7:31 ` Eli Zaretskii
2019-03-01 13:09 ` Alan Mackenzie
2019-03-05 2:17 ` Paul Eggert
2019-04-09 22:47 ` Paul Eggert
2019-04-10 13:12 ` Andy Moreton
2019-04-10 14:59 ` Andy Moreton
2019-04-10 17:36 ` Paul Eggert
2019-04-10 19:26 ` Andy Moreton
2019-04-10 19:43 ` Daniel Colascione
2019-04-10 16:22 ` Alan Mackenzie
2019-04-10 18:05 ` Paul Eggert
2019-04-10 19:45 ` Alan Mackenzie
2019-04-10 20:11 ` Daniel Colascione
2019-04-11 4:11 ` Paul Eggert
2019-04-15 12:36 ` Andy Moreton
2019-04-15 15:32 ` Andy Moreton
2019-04-15 15:53 ` Paul Eggert
2019-04-11 13:13 ` Stefan Monnier
2019-04-11 4:17 ` Paul Eggert
2019-04-10 18:47 ` Daniel Colascione
2019-04-10 18:58 ` Paul Eggert
2019-04-10 19:02 ` Daniel Colascione
2019-04-10 19:22 ` Eli Zaretskii
2019-04-11 9:35 ` Robert Pluim
2019-04-11 18:31 ` Paul Eggert
2019-04-11 19:15 ` Eli Zaretskii
2019-04-11 22:13 ` Daniel Colascione
2019-04-12 6:44 ` Eli Zaretskii
2019-04-11 22:23 ` Paul Eggert
2019-04-11 22:26 ` Daniel Colascione [this message]
2019-04-11 22:38 ` Paul Eggert
2019-04-12 6:39 ` Eli Zaretskii
2019-04-12 19:40 ` Paul Eggert
2019-04-13 9:36 ` Eli Zaretskii
2019-04-14 2:52 ` Paul Eggert
2019-04-12 12:21 ` Andy Moreton
2019-04-12 13:37 ` Alan Mackenzie
2019-04-12 13:55 ` Eli Zaretskii
2019-04-12 13:58 ` Noam Postavsky
2019-04-13 14:06 ` Alan Mackenzie
2019-04-13 14:46 ` About ./configure --cache-file (WAS: CHECK_STRUCTS/dmpstruct.h mechanism is broken.) Noam Postavsky
2019-04-14 2:44 ` Paul Eggert
2019-04-14 3:26 ` Daniel Colascione
2019-04-14 3:49 ` Noam Postavsky
2019-04-14 9:45 ` Alan Mackenzie
2019-04-14 14:08 ` Eli Zaretskii
2019-04-14 14:44 ` Noam Postavsky
2019-04-14 14:53 ` Eli Zaretskii
2019-04-13 8:11 ` CHECK_STRUCTS/dmpstruct.h mechanism is broken Achim Gratz
2019-04-14 2:52 ` Paul Eggert
2019-04-14 3:28 ` Daniel Colascione
2019-04-14 7:22 ` Achim Gratz
2019-04-14 23:29 ` Paul Eggert
2019-04-15 11:31 ` Alan Mackenzie
2019-04-15 14:14 ` Paul Eggert
2019-04-15 18:11 ` Richard Stallman
2019-04-16 18:10 ` Paul Eggert
2019-04-22 2:18 ` Richard Stallman
2019-04-22 4:07 ` Paul Eggert
2019-04-23 1:41 ` Richard Stallman
2019-04-23 3:48 ` Paul Eggert
2019-04-23 6:25 ` Eli Zaretskii
2019-04-23 16:28 ` Paul Eggert
2019-04-23 17:08 ` Eli Zaretskii
2019-04-23 17:19 ` Stefan Monnier
2019-04-24 2:26 ` Richard Stallman
2019-04-15 3:36 ` Richard Stallman
2019-04-15 5:30 ` Paul Eggert
2019-04-11 19:55 ` Achim Gratz
2019-04-11 22:10 ` Daniel Colascione
2019-04-11 22:47 ` Paul Eggert
2019-04-11 22:44 ` Paul Eggert
2019-04-12 17:02 ` Daniele Nicolodi
2019-04-13 8:26 ` Achim Gratz
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