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* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
[not found] <bug-38161-4@http.gcc.gnu.org/bugzilla/>
@ 2013-05-20 22:39 ` jakub at gcc dot gnu.org
2013-05-20 22:42 ` harald at gigawatt dot nl
2013-05-20 22:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-05-20 22:39 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |signupnathan at gmail dot com
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 57345 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
[not found] <bug-38161-4@http.gcc.gnu.org/bugzilla/>
2013-05-20 22:39 ` [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks jakub at gcc dot gnu.org
@ 2013-05-20 22:42 ` harald at gigawatt dot nl
2013-05-20 22:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 7+ messages in thread
From: harald at gigawatt dot nl @ 2013-05-20 22:42 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
Harald van Dijk <harald at gigawatt dot nl> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |harald at gigawatt dot nl
--- Comment #6 from Harald van Dijk <harald at gigawatt dot nl> ---
Given that the standard apparently unintentionally requires this behaviour, and
the standard will likely be changed to require FOO to not be evaluated (see
<http://www.open-std.org/JTC1/SC22/WG14/www/docs/dr_412.htm>), perhaps the
pre-4.4 behaviour should be restored, or at least the diagnostics downgraded to
a warning?
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
[not found] <bug-38161-4@http.gcc.gnu.org/bugzilla/>
2013-05-20 22:39 ` [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks jakub at gcc dot gnu.org
2013-05-20 22:42 ` harald at gigawatt dot nl
@ 2013-05-20 22:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2013-05-20 22:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 57345 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
2008-11-16 21:16 [Bug preprocessor/38161] New: " h dot b dot furuseth at usit dot uio dot no
` (2 preceding siblings ...)
2008-11-18 22:19 ` neil at gcc dot gnu dot org
@ 2008-12-05 12:30 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-12-05 12:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2008-12-05 12:20 -------
*** This bug has been marked as a duplicate of 36453 ***
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
2008-11-16 21:16 [Bug preprocessor/38161] New: " h dot b dot furuseth at usit dot uio dot no
2008-11-17 17:30 ` [Bug preprocessor/38161] [4.4 regression] " tromey at gcc dot gnu dot org
2008-11-17 20:16 ` h dot b dot furuseth at usit dot uio dot no
@ 2008-11-18 22:19 ` neil at gcc dot gnu dot org
2008-12-05 12:30 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 7+ messages in thread
From: neil at gcc dot gnu dot org @ 2008-11-18 22:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from neil at gcc dot gnu dot org 2008-11-18 22:18 -------
The standard talks about the groups controlled by conditionals being skipped.
There is no conditional controlling the #elif - it is at the top level - so I
see nothing permitting its non-evaluation.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
2008-11-16 21:16 [Bug preprocessor/38161] New: " h dot b dot furuseth at usit dot uio dot no
2008-11-17 17:30 ` [Bug preprocessor/38161] [4.4 regression] " tromey at gcc dot gnu dot org
@ 2008-11-17 20:16 ` h dot b dot furuseth at usit dot uio dot no
2008-11-18 22:19 ` neil at gcc dot gnu dot org
2008-12-05 12:30 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 7+ messages in thread
From: h dot b dot furuseth at usit dot uio dot no @ 2008-11-17 20:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from h dot b dot furuseth at usit dot uio dot no 2008-11-17 20:15 -------
Subject: Re: [4.4 regression] #elif <non-const expression #defined in this
#if> breaks
Yes, I should have read the #36320 text more carefully. I merely
noticed that its empty #elif cannot expand to anything correct, while
my example can (and does in the real-life case which produced it).
I thought C99 6.10p7 was what saved it:
The preprocessing tokens within a preprocessing directive are
not subject to macro expansion unless otherwise stated.
but maybe not. 6.10.1p3 doesn't say anything about some #elif branches
not being evaluated:-( Hopefully that's just overly standard-lawerly
though. Maybe comp.std.c would have been a better place to ask.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks
2008-11-16 21:16 [Bug preprocessor/38161] New: " h dot b dot furuseth at usit dot uio dot no
@ 2008-11-17 17:30 ` tromey at gcc dot gnu dot org
2008-11-17 20:16 ` h dot b dot furuseth at usit dot uio dot no
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: tromey at gcc dot gnu dot org @ 2008-11-17 17:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from tromey at gcc dot gnu dot org 2008-11-17 17:29 -------
According to my reading of the standard, this code is in fact incorrect.
This is basically the same as #36320.
I'm beginning to wonder, though, whether this change was overly eager on my
part
and should be made -pedantic only, or something like that.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38161
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2013-05-20 22:52 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-38161-4@http.gcc.gnu.org/bugzilla/>
2013-05-20 22:39 ` [Bug preprocessor/38161] [4.4 regression] #elif <non-const expression #defined in this #if> breaks jakub at gcc dot gnu.org
2013-05-20 22:42 ` harald at gigawatt dot nl
2013-05-20 22:52 ` pinskia at gcc dot gnu.org
2008-11-16 21:16 [Bug preprocessor/38161] New: " h dot b dot furuseth at usit dot uio dot no
2008-11-17 17:30 ` [Bug preprocessor/38161] [4.4 regression] " tromey at gcc dot gnu dot org
2008-11-17 20:16 ` h dot b dot furuseth at usit dot uio dot no
2008-11-18 22:19 ` neil at gcc dot gnu dot org
2008-12-05 12:30 ` rguenth at gcc dot gnu dot org
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