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Re: [PATCH] RFC: xen/x86: Enable --gc-sections
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Tue, 9 Dec 2025 10:12:02 -0500
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Julien Grall" <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 09 Dec 2025 15:12:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-12-09 02:36, Jan Beulich wrote:
On 09.12.2025 00:00, Jason Andryuk wrote:
On 2025-12-08 03:56, Jan Beulich wrote:
On 05.12.2025 23:28, Jason Andryuk wrote:
When linking to create xen-syms, add --gc-sections to garbage collect
unused stuff.
What about xen.efi?
I tried briefly and it fails to link. The GCC manual says it is
considered experimental for PE and COFF.
The gcc manual documents linker behavior? Do you have a more concrete pointer?
My bad - it's binutils. https://sourceware.org/binutils/docs/ld.html
down at --gc-sections:
"Note that garbage collection for COFF and PE format targets is
supported, but the implementation is currently considered to be
experimental."
I just added into EFI_LDFLAGS:
CC .xen.efi.0s.o
ld -mi386pep --no-warn-rwx-segments --subsystem=10
--enable-long-section-names --disable-high-entropy-va --dynamicbase
--image-base=0xffff82d040000000 --stack=0,0 --heap=0,0
--section-alignment=0x200000 --file-alignment=0x20
--major-image-version=4 --minor-image-version=22 --major-os-version=2
--minor-os-version=0 --major-subsystem-version=2
--minor-subsystem-version=0 --gc-sections --print-gc-sections
--build-id=sha1 -T arch/x86/efi.lds prelink.o ./.xen.efi.0s.o -b
pe-x86-64 arch/x86/efi/buildid.o -o ./.xen.efi.0xffff82d040000000.0 && :
ld: kexec_reloc is too large
ld: kexec_reloc is too large
ld:
prelink.o:/home/jandryuk/xen/xen/arch/x86/boot/head.S:60:(.text.header+0x48):
undefined reference to `start'
I see. This then would want mentioning in the patch description. And I've added
it to my binutils side todo list.
I trimmed, but the output continues for a long time.
Thanks,
Jason
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