[llvm-bugs] [Bug 31815] New: spurious Wunused-lambda-capture warning?

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31815

            Bug ID: 31815
           Summary: spurious Wunused-lambda-capture warning?
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rhalbersma at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

#include <iostream>

auto sq(int c, int x) { return c * x * x; }

struct S {
    template<class Fun>
    void for_each(Fun fun) const {
        for (auto i = 1; i < 4; ++i) {
            fun(i);    
        }
    }    
};

int main()
{
    S s;
    auto sum = 0;
    s.for_each([&, i = 2](auto c) mutable {
        sum += sq(c, i++);    
    });
    std::cout << sum;   // 70 = 1 * 4 + 2 * 9 + 3 * 16
}

Works with clang up to 4.0 and gcc up to 7.0 SVN. Gives -Wunused-lambda-capture
for Clang 5.0 SVN tip-of-trunk 

See also http://stackoverflow.com/q/41960347/819272

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20170131/739a970e/attachment.html>