Fix PR#20471. Add a cast in __align_it to ensure that the bit twiddling is done at the correct size. A better solution, IMHO, would be to declare vector<bool>::__bits_per_word as 'size_type', rather than 'unsigned', but that's a possible ABI change.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@214088 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/vector b/include/vector
index 1e638b9..5d41bd1 100644
--- a/include/vector
+++ b/include/vector
@@ -2352,7 +2352,7 @@
void deallocate() _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
static size_type __align_it(size_type __new_size) _NOEXCEPT
- {return __new_size + (__bits_per_word-1) & ~(__bits_per_word-1);};
+ {return __new_size + (__bits_per_word-1) & ~((size_type)__bits_per_word-1);};
_LIBCPP_INLINE_VISIBILITY size_type __recommend(size_type __new_size) const;
_LIBCPP_INLINE_VISIBILITY void __construct_at_end(size_type __n, bool __x);
template <class _ForwardIterator>