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Re: [PATCH v1' 8/8] symbols: check table sizes don't change between linking passes 2 and 3
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 28 Nov 2025 07:52:58 +0100
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 28 Nov 2025 06:53:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.11.2025 20:31, Andrew Cooper wrote:
> On 26/11/2025 1:48 pm, Jan Beulich wrote:
>> --- a/xen/scripts/Kbuild.include
>> +++ b/xen/scripts/Kbuild.include
>> @@ -56,6 +56,19 @@ define filechk
>> fi
>> endef
>>
>> +###
>> +# Compare the symbol tables of two object files. As diff's -I option isn't
>> +# standardized, the name difference of the two object files needs
>> abstracting
>> +# out.
>> +define compare-symbol-tables
>> + ln -f $(1) $(@D)/.cst.$$$$; \
>> + $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(1).sym; \
>> + ln -f $(1) $(@D)/.cst.$$$$; \
>> + $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(2).sym; \
>> + rm -f $(@D)/.cst.$$$$
>
> Doesn't the second link want to be `ln -f $(2)` ?
>
> It looks like this is comparing $(1) to itself.
Ouch. Now I'll be curious if with this corrected I still see this pass
successfully.
>> + diff -u $(1).sym $(2).sym
>> +endef
>
> While I am generally in favour of build time checks, this looks like
> it's a large overhead?
I don't think it's really noticeable in the overall link time, considering
how slow especially the xen.efi linking is.
Jan
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