From: Paul Eggert <eggert@cs.ucla.edu>
To: Andy Moreton <andrewjmoreton@gmail.com>
Cc: 23640@debbugs.gnu.org
Subject: bug#23640: 25.1.50; Getting rid of compiler warnings
Date: Wed, 1 Jun 2016 01:55:13 -0700 [thread overview]
Message-ID: <574EA2F1.3070100@cs.ucla.edu> (raw)
In-Reply-To: <ff882ff4-e092-afe2-3a71-e22bce3c114d@cornell.edu>
> Surely this makes the code easier to understand, since "int i = 0;"
> immediately shows that the variable is always initialised
That is a superficial form of understanding, one that could be satisfied by
initializing all variables whether they need it or not. If instead we make it
clear that the initialization is present only to work around a GCC deficiency,
the reader will get a less-shallow understanding.
> any codebase has to deal with the world as it is,
> not the ideal in one of the applicable standards.
Yes, and Emacs was changed to work around the Cygnus and FreeBSD glitches; see:
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=cb379cbb7fc617f897e7dbc3ce45bf99ea3d1f87
> the performance cost of this is likely to be unmeasurably small
Yes, it's primarily about making the code clearer, not performance.
GCC is gradually getting smarter in this area, and eventually I hope we can
remove more IF_LINT instances. I removed several instances recently; see:
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=237244bbd5ce753bcdf79634561de515bd76c687
prev parent reply other threads:[~2016-06-01 8:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-28 18:40 bug#23640: 25.1.50; Getting rid of compiler warnings Ken Brown
2016-05-28 18:57 ` Eli Zaretskii
2016-05-28 21:47 ` Ken Brown
2016-05-29 22:43 ` Ken Brown
2016-05-30 11:39 ` Ken Brown
2016-05-30 14:41 ` Ken Brown
2016-05-30 16:20 ` Ken Brown
2016-05-30 23:29 ` Paul Eggert
2016-05-31 0:11 ` Ken Brown
2016-05-31 8:03 ` Andy Moreton
2016-05-31 22:22 ` Richard Stallman
2016-05-31 0:15 ` Paul Eggert
2016-06-01 8:35 ` Paul Eggert
2016-06-01 20:37 ` Richard Stallman
2016-06-01 21:10 ` Paul Eggert
2016-06-02 12:05 ` Andy Moreton
2016-06-03 3:35 ` Richard Stallman
2016-06-06 14:45 ` Paul Eggert
2016-06-07 6:19 ` Richard Stallman
2016-06-07 7:15 ` Paul Eggert
2016-06-08 4:00 ` Richard Stallman
2016-06-08 7:18 ` Paul Eggert
2016-06-08 17:06 ` Richard Stallman
2016-06-01 8:55 ` Paul Eggert [this message]
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