[llvm-bugs] [Bug 35669] New: bogus lambda capture is not required warnings [-Wunused-lambda-capture]

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35669

            Bug ID: 35669
           Summary: bogus lambda capture is not required warnings
                    [-Wunused-lambda-capture]
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: boris at codesynthesis.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The following two cases trigger bogus warnings:

    auto& sm (scope_map::instance);

    auto make_global_scope = [&sm] () -> scope&
    {
      auto i (sm.insert (dir_path (), false));
      scope& r (i->second);
      r.out_path_ = &i->first;
      global_scope = scope::global_ = &r;
      return r;
    };

warning: lambda capture 'sm' is not required to be captured for this use
[-Wunused-lambda-capture]

    auto& vp (variable_pool::instance);

    auto set = [&vp, &gs] (const char* var, auto val)
    {
      using T = decltype (val);
      gs.assign (vp.insert<T> (var)) = move (val);
    };

warning: lambda capture 'vp' is not required to be captured for this use
[-Wunused-lambda-capture]

Both sm and vp are references to global variables. For the complete build log,
see:

https://stage.build2.org/?builds=&pn=build2&cf=linux-clang_5.0

The same problem exists in trunk at the time of this report.

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