https://bugs.llvm.org/show_bug.cgi?id=43674
Bug ID: 43674
Summary: Constexpr new: strange behavior and lack of diagnostic
information
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: zamazan...@tut.by
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
I cannot understand why on the example:
#include <iostream>
#include <deque>
int main()
{
constexpr auto res = []
{
std::deque<int> d;
//d.push_back(42);
return d.size();
}();
std::cout << res << std::endl;
return 0;
}
I get the error:
/home/zamazan4ik/OpenSource/test_llvm_lib/main.cpp:6:20: error: constexpr
variable 'res' must be initialized by a constant expression
constexpr auto res = []
^ ~~
without any additional information what is going wrong.
But if you uncomment line with push_back - all will be fine. I cannot
understand, what is wrong here.
My try for constexpr deque you can find here:
https://github.com/ZaMaZaN4iK/llvm-project/tree/feature/deque_constexpr
Preprocessed file: https://gofile.io/?c=VOmzKT
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