On Fri, Feb 16, 2018 at 09:25:30PM +0100, Richard Biener wrote:
> But the broken compilers will overwrite the memset data with possibly 
> uninitialized fields of a TARGET_EXPR. 

For the vec.h case no, there is no temporary involved, it is constructed
directly into the memory.

For the hash-table.h you're right, so we shouldn't change anything,
perhaps we can add something based on C++11 type_traits conditionally
to determine what ctors to look at (std::is_pod false,
std::is_trivially_constructible true?)?

        Jakub

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