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* [Bug c++/52567] New: constant expression not recognized as being constant
@ 2012-03-12 17:48 l_belev at yahoo dot com
2012-03-12 18:10 ` [Bug c++/52567] " marc.glisse at normalesup dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: l_belev at yahoo dot com @ 2012-03-12 17:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567
Bug #: 52567
Summary: constant expression not recognized as being constant
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: l_belev@yahoo.com
when trying to compile the following simple c++ code fragment, gcc gives error
"error: field initializer is not constant"
class RSpans {
public:
static const int max_span = (1<<31)-1;
};
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/52567] constant expression not recognized as being constant 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com @ 2012-03-12 18:10 ` marc.glisse at normalesup dot org 2012-03-12 18:29 ` paolo.carlini at oracle dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: marc.glisse at normalesup dot org @ 2012-03-12 18:10 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567 --- Comment #1 from Marc Glisse <marc.glisse at normalesup dot org> 2012-03-12 18:10:16 UTC --- 1<<31 overflows and is thus not a constant. Try maybe 1LL<<31 ? ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52567] constant expression not recognized as being constant 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com 2012-03-12 18:10 ` [Bug c++/52567] " marc.glisse at normalesup dot org @ 2012-03-12 18:29 ` paolo.carlini at oracle dot com 2012-03-12 20:56 ` l_belev at yahoo dot com ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: paolo.carlini at oracle dot com @ 2012-03-12 18:29 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-03-12 18:28:55 UTC --- Or even 1U, afaics. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52567] constant expression not recognized as being constant 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com 2012-03-12 18:10 ` [Bug c++/52567] " marc.glisse at normalesup dot org 2012-03-12 18:29 ` paolo.carlini at oracle dot com @ 2012-03-12 20:56 ` l_belev at yahoo dot com 2012-03-12 21:00 ` pinskia at gcc dot gnu.org 2012-03-12 21:08 ` l_belev at yahoo dot com 4 siblings, 0 replies; 6+ messages in thread From: l_belev at yahoo dot com @ 2012-03-12 20:56 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567 --- Comment #3 from Luchezar Belev <l_belev at yahoo dot com> 2012-03-12 20:56:10 UTC --- It overflows alright, but what this has to do with not being constant? An overflow in a constant expression makes it variable? I fail to see the logic here ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52567] constant expression not recognized as being constant 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com ` (2 preceding siblings ...) 2012-03-12 20:56 ` l_belev at yahoo dot com @ 2012-03-12 21:00 ` pinskia at gcc dot gnu.org 2012-03-12 21:08 ` l_belev at yahoo dot com 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2012-03-12 21:00 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567 --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-03-12 20:59:39 UTC --- An overflow in an integer expression is never an integer constant expression. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52567] constant expression not recognized as being constant 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com ` (3 preceding siblings ...) 2012-03-12 21:00 ` pinskia at gcc dot gnu.org @ 2012-03-12 21:08 ` l_belev at yahoo dot com 4 siblings, 0 replies; 6+ messages in thread From: l_belev at yahoo dot com @ 2012-03-12 21:08 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52567 --- Comment #5 from Luchezar Belev <l_belev at yahoo dot com> 2012-03-12 21:08:07 UTC --- Ok, but at least the error message should be changed to tell about overflow. For example the following code gives error too, but it says "error: overflow in constant expression" which is more clear int foo(int x) { switch (x) { case 1: return 5; case (1<<31)-1: return 7; } } ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-03-12 21:08 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-03-12 17:48 [Bug c++/52567] New: constant expression not recognized as being constant l_belev at yahoo dot com 2012-03-12 18:10 ` [Bug c++/52567] " marc.glisse at normalesup dot org 2012-03-12 18:29 ` paolo.carlini at oracle dot com 2012-03-12 20:56 ` l_belev at yahoo dot com 2012-03-12 21:00 ` pinskia at gcc dot gnu.org 2012-03-12 21:08 ` l_belev at yahoo dot com
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