[Bug target/30047] Corrupt return value in specific context

[gcc at david dot osborn dot name]

------- Comment #1 from gcc at david dot osborn dot name  2008-06-08 19:55 -------
Created an attachment (id=15736)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15736&action=view)
reduced testcase

This bug still exists in GCC 4.3.1.  I've narrowed it down to line 183 in
bits/basic_ios.tcc where it says:

extern template class basic_ios<char>;

If you comment out this line, the code produces the correct result (12345). 
Otherwise it produced zero consistently.  The attached testcase leaves a lot
out of the iostream classes, so it may be technically invalid.  But it yields
that same results as the previous testcase, as well as with respect to the
"extern template" line.

Also, the std::vector in the original testcase can be replaced by an empty
class with an explicit destructor.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30047