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Subject: [Bug c++/55382] New: Constant class member as alignment specifier
Date: Sun, 18 Nov 2012 18:20:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55382

             Bug #: 55382
           Summary: Constant class member as alignment specifier
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: aanisimov@inbox.ru


Consider the following sample code:

struct A
{
        static const unsigned alignment = 32;

        char data[1234] __attribute__((aligned(alignment /*+ 0*/)));
} __attribute__((aligned(A::alignment /* + 0 */)));

g++ (r193606) complains that "requested alignment is not an integer constant",
but when the "+ 0" part is uncommented, the requested alignment magically
becomes a constant.