<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Cannot eval function which returns empty struct. Error [IRForTarget]: Size of result type 'struct foo { }' couldn't be determined"
   href="https://llvm.org/bugs/show_bug.cgi?id=31612">31612</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Cannot eval function which returns empty struct. Error [IRForTarget]: Size of result type 'struct foo { }' couldn't be determined
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lldb
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.9
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>lldb-dev@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>safinaskar@mail.ru
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>root@ideal-os:~# cat /o.cpp
struct foo
{
};

foo
f (void)
{
  return {};
}

int
main (void)
{
  f ();
}
root@ideal-os:~# clang++-3.9 -std=c++11 -g -o /o /o.cpp
root@ideal-os:~# lldb-3.9 /o
(lldb) target create "/o"
Current executable set to '/o' (x86_64).
(lldb) b main
Breakpoint 1: where = o`main + 4 at o.cpp:14, address = 0x00000000004004e4
(lldb) r
Process 366 launched: '/o' (x86_64)
Process 366 stopped
* thread #1: tid = 366, 0x00000000004004e4 o`main + 4 at o.cpp:14, name = 'o',
stop reason = breakpoint 1.1
    frame #0: 0x00000000004004e4 o`main + 4 at o.cpp:14
(lldb) p f ()
Error [IRForTarget]: Size of result type 'struct foo {
}' couldn't be determined
error: The expression could not be prepared to run in the target
(lldb)

Environment same as in <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - error: calling 'f' with incomplete return type 'string' (aka 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >')"
   href="show_bug.cgi?id=31611">https://llvm.org/bugs/show_bug.cgi?id=31611</a></pre>
        </div>
      </p>
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