[RFC PATCH u-boot 02/12] sandbox: errno: avoid conflict with libc's errno

[Simon Glass]

Hi Marek,

On Fri, 5 Mar 2021 at 08:37, Marek Behun <marek.behun at nic.cz> wrote:
>
> On Fri, 5 Mar 2021 11:00:45 +0800
> Bin Meng <bmeng.cn at gmail.com> wrote:
>
> > On Wed, Mar 3, 2021 at 12:13 PM Marek Behún <marek.behun at nic.cz> wrote:
> > >
> > > When building with LTO, the system libc's `errno` variable used in
> > > arch/sandbox/cpu/os.c conflicts with U-Boot's `errno` (defined in
> > > lib/errno.c) with the following error:
> > >  .../ld: errno@@GLIBC_PRIVATE: TLS definition in /lib64/libc.so.6
> > >          section .tbss mismatches non-TLS reference in
> > >          /tmp/u-boot.EQlEXz.ltrans0.ltrans.o
> >
> > Do you know if this is the expected behavior when enabling LTO on the compiler?
>
> I don't, but this is a bug anyway. The symbol clashes with the symbol
> from glibc. Does somebody know whether the usage of this symbol in os.c
> does really use glibc's version or U-Boot's one?

It is intended to use glibc's version. In fact I don't think U-Boot
should have an errno. We return errors in each case, as does Linux.

Regards,
Simon