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Re: [PATCH v2 2/7] Arm: split xen-syms linking rule
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 3 Sep 2026 09:35:57 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
- Delivery-date: Thu, 03 Sep 2026 07:36:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.09.2026 18:32, Anthony PERARD wrote:
> On Wed, Aug 26, 2026 at 02:00:55PM +0200, Jan Beulich wrote:
>> Doing so, besides (hopefully) adding clarity (not the least by way of
>> [re-]using pattern rules where possible), also avoids explicit recursive
>> $(MAKE) invocations.
>>
>> By re-using the generic rules introduced when the respective x86 rule was
>> split,
>> - the .map file now isn't created after the final binary anymore,
>> - --strip-debug is passed to $(LD) during early linking passes (for
>> consistency the option is also explicitly added to the optional linking
>> pass rule),
>> - CONFIG_{SUPPRESS_DUPLICATE_SYMBOL_WARNINGS,ENFORCE_UNIQUE_SYMBOLS} are
>> now properly respected.
>> Orphan section checking, otoh, is getting suppressed for now, until the
>> about a dozen warnings which would result have been taken care of.
>>
>> While the 4th linking step continues to be avoided when possible, a
>> redundant invocation of $(NM) and tools/symbols (plus the assembling of
>> the resulting .S file) is hopefully deemed acceptable.
>
> So with this patch, if .xen-syms.1.o and .xen-syms.2.o are the same
> (compare-symbols-tables), we through away .xen-syms.2.o, and build
> .xen-syms.3.o from .xen-syms.1 (nm|symbols + as). I guess the resulting
> .xen-syms.3.o would be the same as .xen-syms.2.o,
Anything else would be a significant problem: nm, tools/symbols, and gas
would better produce the same output from the same input.
> so it's probably fine.
>
>
> I think this patch is fine, I didn't find other difference in command
> executed beside the one described in the patch description:
>
> Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Thanks.
Jan
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