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* Re: c++/10479: __alignof__(double) not compile time constant inside template class
@ 2003-04-24 13:47 bangerth
0 siblings, 0 replies; 2+ messages in thread
From: bangerth @ 2003-04-24 13:47 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, rguenth
Synopsis: __alignof__(double) not compile time constant inside template class
State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Thu Apr 24 13:47:51 2003
State-Changed-Why:
Confirmed.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10479
^ permalink raw reply [flat|nested] 2+ messages in thread
* c++/10479: __alignof__(double) not compile time constant inside template class
@ 2003-04-24 12:16 rguenth
0 siblings, 0 replies; 2+ messages in thread
From: rguenth @ 2003-04-24 12:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 10479
>Category: c++
>Synopsis: __alignof__(double) not compile time constant inside template class
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Thu Apr 24 12:16:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Richard Guenther
>Release: from 2.95 throughout 3.4
>Organization:
>Environment:
ia32 linux-gnu
>Description:
__alignof__(double) or any other not-dependend type is rejected as being not compile-time constant in a template class. Like:
template <int i>
struct foo2 {
float bar __attribute__((aligned(__alignof__(double))));
};
while in a non-template context (just omit the template <int i> from the above example), it is accepted. Also specifying 8 rather than __alignof__(double) is ok.
bellatrix:~/src/tests$ g++ -c attribute.cpp
attribute.cpp:7: requested alignment is not a constant
While of course __alignof__ is a gnu extension this behavior may be "correct", but it is surely not what one would expect and undocumented.
>How-To-Repeat:
>Fix:
A workaorund is to use a configure check for the alignment and create a #define for the actual constant.
>Release-Note:
>Audit-Trail:
>Unformatted:
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2003-04-24 13:47 c++/10479: __alignof__(double) not compile time constant inside template class bangerth
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2003-04-24 12:16 rguenth
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