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Re: [PATCH v1' 8/8] symbols: check table sizes don't change between linking passes 2 and 3
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 27 Nov 2025 19:31:12 +0000
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- Cc: andrew.cooper3@xxxxxxxxxx, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 27 Nov 2025 19:31:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
> + 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?
~Andrew
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