Re: [Xen-devel] [Linaro-uefi] [PATCH RFC 19/19] Add EFI stub for ARM64

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian & Roy,

On 10/07/14 09:13, Ian Campbell wrote:
> > > Probably the easiest thing to do there is to create
> > > xen/arch/arm/efi/stub.c and do the fshort-char trick for that entire
> > > folder, since I don't think our build system makes it especially easy to
> > > change CFLAGS for individual object files.
> > Yes and yes.  I will likely end up with some single file directories due to the
> > build option differences.  Is there a XEN build system expert that I can ask
> > for help if needed?  (Or should I just post to the list?)
> I'm not sure anyone is an expert on this stuff but feel free to prod me
> either here or on #xenarm.
>
> I think you just need something like, in xen/arch/arm/Makefile
>     subdir-$(arm64) += efi # or CONFIG_EFI etc
> and in xen/arch/arm/efi/Makefile:
>     CFLAGS += -fshort-wchar
>     obj-y += foo.o etc.o
>
> much the same for xen/common/efi.
The Xen buildsystem doesn't provide CFLAGS facilities as the Kernel, but 
the Makefile has a syntax to append data in variables for a specific target.
If your efi.c is in xen/arch/arm/, you need to add in xen/arch/arm/Makefile:

efi.o: CFLAGS += -fshort-wchar

Regards,

--
Julien Grall

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