http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57210
Bug #: 57210
Summary: Using alignas with an union does not compile.
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: damien.le...@gmail.com
I have a construct of the form:
template <unsigned int ALIGNMENT>
class foo {
/* ... */
private:
alignas(ALIGNMENT) union bar_ { /* ... */ } bar;
};
which does not compile with the following errors:
error: 'ALIGNMENT' is not a type
error: ISO C++ forbids declaration of 'alignas' with no type [-fpermissive]
error: expected ';' at end of member declaration
The following alternatives have been tried without success:
/* ... */
union alignas(ALIGNMENT) bar_ { /* ... */ } bar;
union bar_ { alignas(ALIGNMENT) int foo; /* ... */ } bar;
/* ... */
With different but equivalent error messages.
