[U-Boot] [BUG] qemu-x86_defconfig does not build with GCC 8.1

[Heinrich Schuchardt]

On 08/06/2018 05:13 PM, Andy Shevchenko wrote:
> On Sun, Jul 29, 2018 at 3:09 PM, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>> On 07/29/2018 02:40 AM, Bin Meng wrote:
> 
>> Ubuntu Cosmic has gcc 8.2. Setting up a virtual machine with
>> virt-manager is quite easy.
> 
> Can you check if output of `gcc -v` has --enable-default-pie?

The flag is enabled both for gcc-7 and gcc-8 in Debian Buster.

> If so (I bet it is the case), can you try the following patch (sorry,
> it's mangled, needs manual apply)
> 
> --- a/Makefile
> +++ b/Makefile
> @@ -371,6 +371,7 @@ KBUILD_CPPFLAGS := -D__KERNEL__ -D__UBOOT__
> 
> KBUILD_CFLAGS   := -Wall -Wstrict-prototypes \
>                   -Wno-format-security \
> +                  -fno-pie \
>                   -fno-builtin -ffreestanding $(CSTD_FLAG)
> KBUILD_CFLAGS  += -fshort-wchar
> KBUILD_AFLAGS   := -D__ASSEMBLY__
> 
> P.S. I have no time right now to test this myself though.

With the flag building with gcc-8.1 works. But the interesting question
is whether the EFI subsystem will be able to relocate the runtime code
when the EFI sercice SetVirtualAddressMap is called.

Best regards

Heinrich