new warning on the 3.0 branch

[Gabriel Dos Reis]

Sylvain Pion <Sylvain.Pion@sophia.inria.fr> writes:

| There is a new warning that appeared last week on the 3.0 branch, which I
| suspect comes from Nathan's recent changes.
| Compiling the following program with "g++ -Wall" :
| 
| struct empty{};
| 
| int main()
| {
|   empty a, b;
|   a = b;
|   return 0;
| }
| 
| produces the warning :
| empty_copy_warning.C:7: warning: statement with no effect


The symptoms you're describing match bug report #3989

	http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3989

which represents is a regression from 3.0 to 3.0.1

-- Gaby
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