[Buildroot] [Bug 13586] New: grub failure with BR2_OPTIMIZE_3

[Yann E. MORIN <yann.morin.1998@free.fr>]

Andreas, All,

On 2021-05-31 12:22 +0200, Andreas Hilse via buildroot spake thusly:
> > So, maybe things have changed from way back when we wrote that comment
> > (back in 2014, seven years ago!), or maybe we did not undestand all of
> > it, or maybe we did not explain it properly, or a bit of all of that...
> >
> > In any case, we might want to also override CFLAGS and CPPFLAGS in the
> > same vein as the above patch does for TARGET_CFLAGS et al.
> >
> > Care to have a look at that, see if it fixes the issue, and you can get
> > a bootable grub2, please?
> 
> Additionally overriding CFLAGS and CPPFLAGS results in a bootable grub2.
> 
> diff --git a/boot/grub2/grub2.mk b/boot/grub2/grub2.mk
> index af16ee91e1..52e9199ae9 100644
> --- a/boot/grub2/grub2.mk
> +++ b/boot/grub2/grub2.mk
> @@ -118,9 +118,11 @@ HOST_GRUB2_CONF_ENV = \
>  GRUB2_CONF_ENV = \
>         CPP="$(TARGET_CC) -E" \
>         TARGET_CC="$(TARGET_CC)" \
> -       TARGET_CFLAGS="$(TARGET_CFLAGS)" \
> -       TARGET_CPPFLAGS="$(TARGET_CPPFLAGS) -fno-stack-protector" \
> -       TARGET_LDFLAGS="$(TARGET_LDFLAGS)" \
> +       CFLAGS="$(TARGET_CFLAGS) -Os" \
> +       TARGET_CFLAGS="$(TARGET_CFLAGS) -Os" \
> +       CPPFLAGS="$(TARGET_CPPFLAGS) -Os -fno-stack-protector" \
> +       TARGET_CPPFLAGS="$(TARGET_CPPFLAGS) -Os -fno-stack-protector" \
> +       TARGET_LDFLAGS="$(TARGET_LDFLAGS) -Os" \
>         TARGET_NM="$(TARGET_NM)" \
>         TARGET_OBJCOPY="$(TARGET_OBJCOPY)" \
>         TARGET_STRIP="$(TARGET_CROSS)strip"

Thanks for the feedback. Could you submit a proper patch, with an actual
commit log (title, body with a summary of this thread, and your SoB-line),
please?

Regards,
Yann E. MORIN.

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