[libc++] Fix PR35491 - std::array of zero-size doesn't work with non-default constructible types.
Summary:
This patch fixes llvm.org/PR35491 and LWG2157 (https://cplusplus.github.io/LWG/issue2157)
The fix attempts to maintain ABI compatibility by replacing the array with a instance of `aligned_storage`.
Reviewers: mclow.lists, EricWF
Reviewed By: EricWF
Subscribers: lichray, cfe-commits
Differential Revision: https://reviews.llvm.org/D41223
llvm-svn: 324526
diff --git a/libcxx/test/std/containers/sequences/array/empty.fail.cpp b/libcxx/test/std/containers/sequences/array/empty.fail.cpp
index 85bf5a7..fe118c5 100644
--- a/libcxx/test/std/containers/sequences/array/empty.fail.cpp
+++ b/libcxx/test/std/containers/sequences/array/empty.fail.cpp
@@ -23,6 +23,9 @@
int main ()
{
+
std::array<int, 1> c;
- c.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+ c.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+ std::array<int, 0> c0;
+ c0.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
}