<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/86987>86987</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            ODR warning in MachineScheduler.h (GenericSchedulerBase)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          efriedma-quic
      </td>
    </tr>
</table>

<pre>
    When building with -flto -Werror=odr to find possible runtime issues w/ LTO:

```
/var/tmp/portage/sys-devel/llvm-18.1.0/work/llvm/include/llvm/CodeGen/MachineScheduler.h:1067: error: virtual table of type ‘struct GenericSchedulerBase’ violates one definition rule [-Werror=odr]
 1067 | class GenericSchedulerBase : public MachineSchedStrategy {
      | 
/var/tmp/portage/sys-devel/llvm-18.1.0/work/llvm/include/llvm/CodeGen/MachineScheduler.h:1067: note: the conflicting type defined in another translation unit
 1067 | class GenericSchedulerBase : public MachineSchedStrategy {
      | 
<built-in>: note: virtual method ‘__cxa_pure_virtual’
/var/tmp/portage/sys-devel/llvm-18.1.0/work/llvm/include/llvm/CodeGen/MachineScheduler.h:257: note: ought to match virtual method ‘scheduleTree’ but does not
  257 |   virtual void scheduleTree(unsigned SubtreeID) {}
      | 
```

Split from #84577 . Originally reported downstream in Gentoo at https://bugs.gentoo.org/926529.
</pre>
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