> Le 24 août 2018 à 19:35, Jiahao Li <[email protected]> a écrit :
>
> Currently, in bison's C++ parser template (`lalr.cc`), the `variant<>`
> struct's `build()` method uses placement-new in the form `new (...) T` to
> initialize a variant type. However, for POD variant types, this will leave
> the memory space uninitialized. If we subsequently tries to `::move` into a
> variant object in such state, the call can trigger clang's undefined behavior
> sanitizer due to accessing the uninitialized memory.
>
> This attached patch changes the code to use the `new (...) T ()` form (note
> the parentheses at the end) instead, so that the memory space will be
> zero-initialized.
Thanks a lot! Installed.
