[llvm-bugs] [Bug 40512] Binary size exploding when using a lambda in a template with multiple parameters

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40512

David Blaikie <dblaikie at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #6 from David Blaikie <dblaikie at gmail.com> ---
(In reply to A. Joël Lamotte from comment #5)
> Thank you very much for this clarification, it helps a lot.
> Not sure what to do about it. Probably that would need some change to the
> standard to be fixed, or an epic effort from compiler impls.

Yep, pretty much.

For the original code, you've got the external function which is probably the
simplest thing to do. (you could outline more of the code to reduce duplication
further - incnluding the thread construction and usage:

template<typename A>
void do_f(A a) {
  std::thread t{
    [a] {
      if (a % 2 == A(0)) {
        std::cout << "even: " << a << '\n';
      } else {
        std::cout << "odd: " << a << '\n';
      }
    }
  };
  t.detach();
}

...
  auto f() const {
    do_f(a);
  }

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