Building UHD 4.10.0.0 fails with undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'

[climb4]

Issue Description

When trying to build UHD 4.10.0.0 from source it fails with the following error message:

[ 72%] Linking CXX executable client_zero_test
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::detail::client_zero::client_zero(std::shared_ptr<uhd::rfnoc::register_iface>)':
client_zero.cpp:(.text+0xeda): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::detail::client_zero::make(uhd::rfnoc::chdr_ctrl_endpoint&, unsigned short)':
client_zero.cpp:(.text+0x12f5): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: client_zero.cpp:(.text+0x130e): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `std::_Sp_counted_ptr_inplace<uhd::rfnoc::chdr_ctrl_xport, std::allocator<void>, (__gnu_cxx::_Lock_policy)2>::_M_dispose()':
client_zero.cpp:(.text._ZNSt23_Sp_counted_ptr_inplaceIN3uhd5rfnoc15chdr_ctrl_xportESaIvELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv[_ZNSt23_Sp_counted_ptr_inplaceIN3uhd5rfnoc15chdr_ctrl_xportESaIvELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv]+0x5): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::register_iface_holder::~register_iface_holder()':
client_zero.cpp:(.text._ZN3uhd5rfnoc21register_iface_holderD2Ev[_ZN3uhd5rfnoc21register_iface_holderD5Ev]+0x10a): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o:client_zero.cpp:(.text._ZN3uhd5rfnoc21register_iface_holderD0Ev[_ZN3uhd5rfnoc21register_iface_holderD5Ev]+0x161): more undefined references to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()' follow

Setup Details

Version: tags/v4.10.0.0
OS: up-to-date Arch Linux
cmake flags: -DENABLE_RFNOC_DEV=ON

Expected Behavior

Build runs succesfully

Actual Behaviour

[ 72%] Linking CXX executable client_zero_test
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::detail::client_zero::client_zero(std::shared_ptr<uhd::rfnoc::register_iface>)':
client_zero.cpp:(.text+0xeda): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::detail::client_zero::make(uhd::rfnoc::chdr_ctrl_endpoint&, unsigned short)':
client_zero.cpp:(.text+0x12f5): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: client_zero.cpp:(.text+0x130e): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `std::_Sp_counted_ptr_inplace<uhd::rfnoc::chdr_ctrl_xport, std::allocator<void>, (__gnu_cxx::_Lock_policy)2>::_M_dispose()':
client_zero.cpp:(.text._ZNSt23_Sp_counted_ptr_inplaceIN3uhd5rfnoc15chdr_ctrl_xportESaIvELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv[_ZNSt23_Sp_counted_ptr_inplaceIN3uhd5rfnoc15chdr_ctrl_xportESaIvELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv]+0x5): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o: in function `uhd::rfnoc::register_iface_holder::~register_iface_holder()':
client_zero.cpp:(.text._ZN3uhd5rfnoc21register_iface_holderD2Ev[_ZN3uhd5rfnoc21register_iface_holderD5Ev]+0x10a): undefined reference to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()'
/usr/bin/ld: CMakeFiles/client_zero_test.dir/__/lib/rfnoc/client_zero.cpp.o:client_zero.cpp:(.text._ZN3uhd5rfnoc21register_iface_holderD0Ev[_ZN3uhd5rfnoc21register_iface_holderD5Ev]+0x161): more undefined references to `uhd::rfnoc::chdr_ctrl_xport::~chdr_ctrl_xport()' follow

Steps to reproduce the problem

git clone git@github.com:EttusResearch/uhd.git
cd uhd/host
git checkout tags/v4.10.0.0
mkdir build
cd build
cmake .. -DENABLE_RFNOC_DEV=ON
make

Additional Information

[mbr0wn]

This is reproducible in a container. The fix is to make the linkage more explicit:

commit 129bc4c7af17dd7322834fa5479a52768e282850
Author: Martin Braun <martin.braun@ettus.com>
Date:   Thu Jun 11 15:32:17 2026 +0200

    tests: Update linking instructions for client_zero_test

    On Arch Linux, users have reported linker error otherwise.

diff --git a/host/tests/CMakeLists.txt b/host/tests/CMakeLists.txt
index fc0a81427c..1d3643409a 100644
--- a/host/tests/CMakeLists.txt
+++ b/host/tests/CMakeLists.txt
@@ -362,6 +362,8 @@ UHD_ADD_NONAPI_TEST(
     TARGET client_zero_test.cpp
     EXTRA_SOURCES
     ${UHD_SOURCE_DIR}/lib/rfnoc/client_zero.cpp
+    ${UHD_SOURCE_DIR}/lib/rfnoc/chdr_packet_writer.cpp
+    ${UHD_SOURCE_DIR}/lib/rfnoc/chdr_ctrl_xport.cpp
 )

 UHD_ADD_NONAPI_TEST(

We'll put this on master soon.

[mbr0wn]

This will go live with our next push to public master.