Re: [PATCH v2 2/8] lib: collect library files in an archive

[Jan Beulich <jbeulich@xxxxxxxx>]

On 18.11.2020 18:31, Julien Grall wrote:
> On 23/10/2020 11:17, Jan Beulich wrote:
>> In order to (subsequently) drop odd things like CONFIG_NEEDS_LIST_SORT
>> just to avoid bloating binaries when only some arch-es and/or
>> configurations need generic library routines, combine objects under lib/
>> into an archive, which the linker then can pick the necessary objects
>> out of.
>>
>> Note that we can't use thin archives just yet, until we've raised the
>> minimum required binutils version suitably.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>>   xen/Rules.mk          | 33 +++++++++++++++++++++++++++------
>>   xen/arch/arm/Makefile |  6 +++---
>>   xen/arch/x86/Makefile |  8 ++++----
>>   xen/lib/Makefile      |  3 ++-
>>   4 files changed, 36 insertions(+), 14 deletions(-)
> 
> I can't build Xen on Arm after this patch:
> 
>    AR      lib.a
> aarch64-linux-gnu-ld    -EL  -r -o built_in.o
> aarch64-linux-gnu-ld: no input files
> /home/ANT.AMAZON.COM/jgrall/works/oss/xen/xen/Rules.mk:154: recipe for 
> target 'built_in.o' failed

Oh, indeed, this triggers a pre-existing bug. I didn't notice it
because for Arm I build-tested only the series as a whole. Will
add a fix for the issue as prereq patch.

Thanks for noticing,
Jan