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From: rguenth@tat.physik.uni-tuebingen.de To: gcc-gnats@gcc.gnu.org Subject: c++/10479: __alignof__(double) not compile time constant inside template class Date: Thu, 24 Apr 2003 12:16:00 -0000 [thread overview] Message-ID: <20030424121013.10247.qmail@sources.redhat.com> (raw) >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:
next reply other threads:[~2003-04-24 12:16 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-04-24 12:16 rguenth [this message] 2003-04-24 13:47 bangerth
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