[Bug driver/112759] [13/14 regression] mips -march=native detection broken with gcc 13+

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112759

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[13 regression] mips        |[13/14 regression] mips
                   |-march=native detection     |-march=native detection
                   |broken with gcc 13+         |broken with gcc 13+

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, looks like it is this part of the change:
+  if (cpu)
+    ret = reconcat (ret, ret, "-m", argv[0], "=", cpu, NULL);

-  return concat ("-m", argv[0], "=", cpu, NULL);


Maybe it should have been:
```
if (cpu)
  {
    if (!ret)
      ret = concat ("-m", argv[0], "=", cpu, NULL);
    else
      ret = reconcat (ret, ret, "-m", argv[0], "=", cpu, NULL);
  }
```

Can you try that?