[Buildroot] [PATCH] package/linux-tools: hv: fix build on non-x86 build hosts

[Buildroot] [PATCH] package/linux-tools: hv: fix build on non-x86 build hosts

[Yegor Yefremov]

Since Linux 5.4, commit 9b5434196529 ("Tools: hv: move to tools
buildsystem"), the Hyper-V daemons are built with tools/build, which
first links the objects with "$(LD) -r". We only pass CC to the hv
build, so LD defaults to $(CROSS_COMPILE)ld, i.e. the build host's
plain ld. That only works by chance on x86 build hosts, whose ld
handles i386/x86_64 objects; on an aarch64 build host it fails:

  LD      hv_kvp_daemon-in.o
/usr/bin/ld.bfd: relocatable linking with relocations from format elf32-i386 (hv_kvp_daemon.o) to format elf64-littleaarch64 (hv_kvp_daemon-in.o) is not supported

Pass LD="$(TARGET_LD)", as already done for rtla.

This issue has been present since commit 2703383c7201 ("package/linux-tools:
add hyperv integration services"), which added the hv tools while the
supported kernels already used tools/build for them, without passing
LD. It therefore affects 2020.02 and later, including 2025.02.x.

Fixes:
https://autobuild.buildroot.org/results/86c33797a5f09dbb1162a554cb6019f7c0702fbd

Fixes: 2703383c72011d38a1e3559cb7a5a2b0071b35c6 ("package/linux-tools: add hyperv integration services")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
---
 package/linux-tools/linux-tool-hv.mk.in | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/package/linux-tools/linux-tool-hv.mk.in b/package/linux-tools/linux-tool-hv.mk.in
index e638fecfc6..3aead40178 100644
--- a/package/linux-tools/linux-tool-hv.mk.in
+++ b/package/linux-tools/linux-tool-hv.mk.in
@@ -16,7 +16,10 @@ HV_hv_kvp_daemon = hypervkvpd
 HV_hv_fcopy_daemon = hypervfcopyd
 HV_hv_vss_daemon = hypervvssd
 
-HV_MAKE_OPTS = CC="$(TARGET_CC)" CFLAGS="$(filter-out -g%,$(TARGET_CFLAGS))"
+HV_MAKE_OPTS = \
+	CC="$(TARGET_CC)" \
+	LD="$(TARGET_LD)" \
+	CFLAGS="$(filter-out -g%,$(TARGET_CFLAGS))"
 
 define HV_BUILD_CMDS
 	$(Q)for prog in $(HV_PROGS_y); do \
-- 
2.34.1

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Re: [Buildroot] [PATCH] package/linux-tools: hv: fix build on non-x86 build hosts

[Thomas Petazzoni via buildroot]

On Wed, Nov 04, 2026 at 09:27:35AM +0100, Yegor Yefremov wrote:
> Since Linux 5.4, commit 9b5434196529 ("Tools: hv: move to tools
> buildsystem"), the Hyper-V daemons are built with tools/build, which
> first links the objects with "$(LD) -r". We only pass CC to the hv
> build, so LD defaults to $(CROSS_COMPILE)ld, i.e. the build host's
> plain ld. That only works by chance on x86 build hosts, whose ld
> handles i386/x86_64 objects; on an aarch64 build host it fails:
> 
>   LD      hv_kvp_daemon-in.o
> /usr/bin/ld.bfd: relocatable linking with relocations from format elf32-i386 (hv_kvp_daemon.o) to format elf64-littleaarch64 (hv_kvp_daemon-in.o) is not supported
> 
> Pass LD="$(TARGET_LD)", as already done for rtla.
> 
> This issue has been present since commit 2703383c7201 ("package/linux-tools:
> add hyperv integration services"), which added the hv tools while the
> supported kernels already used tools/build for them, without passing
> LD. It therefore affects 2020.02 and later, including 2025.02.x.
> 
> Fixes:
> https://autobuild.buildroot.org/results/86c33797a5f09dbb1162a554cb6019f7c0702fbd
> 
> Fixes: 2703383c72011d38a1e3559cb7a5a2b0071b35c6 ("package/linux-tools: add hyperv integration services")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

Applied to master, thanks!

Best regards,

Thomas Petazzoni
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH] package/linux-tools: hv: fix build on non-x86 build hosts

[Thomas Petazzoni via buildroot]

On Wed, Nov 04, 2026 at 09:27:35AM +0100, Yegor Yefremov wrote:
> Since Linux 5.4, commit 9b5434196529 ("Tools: hv: move to tools
> buildsystem"), the Hyper-V daemons are built with tools/build, which
> first links the objects with "$(LD) -r". We only pass CC to the hv
> build, so LD defaults to $(CROSS_COMPILE)ld, i.e. the build host's
> plain ld. That only works by chance on x86 build hosts, whose ld
> handles i386/x86_64 objects; on an aarch64 build host it fails:
> 
>   LD      hv_kvp_daemon-in.o
> /usr/bin/ld.bfd: relocatable linking with relocations from format elf32-i386 (hv_kvp_daemon.o) to format elf64-littleaarch64 (hv_kvp_daemon-in.o) is not supported
> 
> Pass LD="$(TARGET_LD)", as already done for rtla.
> 
> This issue has been present since commit 2703383c7201 ("package/linux-tools:
> add hyperv integration services"), which added the hv tools while the
> supported kernels already used tools/build for them, without passing
> LD. It therefore affects 2020.02 and later, including 2025.02.x.
> 
> Fixes:
> https://autobuild.buildroot.org/results/86c33797a5f09dbb1162a554cb6019f7c0702fbd
> 
> Fixes: 2703383c72011d38a1e3559cb7a5a2b0071b35c6 ("package/linux-tools: add hyperv integration services")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

Applied to master, thanks!

Best regards,

Thomas Petazzoni
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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