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From: "goldstein.w.n at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug build/29454] dl-cache.c:513: undefined reference to `strcpy'
 with -Og or -O1 (doesn't happen with -O2)
Date: Mon, 08 Aug 2022 02:52:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29454

--- Comment #17 from Noah Goldstein <goldstein.w.n at gmail dot com> ---
(In reply to H.J. Lu from comment #16)
> (In reply to Noah Goldstein from comment #12)
>=20
> > which I think is a different issue.
> >=20
> > H.J I will post this patch (and the other one for the ifdef tomorrow
> > morning). Do you know why this was necessary for the non-optimized buil=
d?
>=20
> Some parts of glibc must be compiled with optimization.  If there is foo.=
[cS]
> under sysdeps/x86_64/multiarch, the one in sysdeps/x86_64 will be ignored.
> Does GCC inline strcpy with -O2 in dl-cache.c?

Yeah the usage is:

```
  char *temp;
  temp =3D alloca (strlen (best) + 1);
  strcpy (temp, best);
  return __strdup (temp);
```

Which gets converted to `memcpy` (because of already computed strlen) in
strlen_pass::handle_builtin_strcpy.

--=20
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