Use rtcx from the librtcx repository

cpp/CMakeLists.txt

@@ -419,11 +419,8 @@ include(cmake/thirdparty/get_xxhash.cmake)
 # find zstd
 include(cmake/thirdparty/get_zstd.cmake)
 
-# Build librtcx as a subdirectory (zstd and nvtx3 are already available at this point)
-add_subdirectory(librtcx)
-
-# JIT Embedding helper functions
-include(librtcx/embed.cmake)
+# Fetch librtcx via CPM (zstd and nvtx3 are already available at this point)
+include(cmake/thirdparty/get_rtcx.cmake)
 
 # Pre-compiled fragment management helper functions
 include(cmake/Modules/AddFragment.cmake)
@@ -432,7 +429,7 @@ include(cmake/Modules/AddFragment.cmake)
 if(NOT BUILD_SHARED_LIBS)
   include("${rapids-cmake-dir}/export/find_package_file.cmake")
   list(APPEND METADATA_KINDS BUILD INSTALL)
-  list(APPEND dependencies KvikIO ZLIB nvcomp nanoarrow zstd)
+  list(APPEND dependencies KvikIO ZLIB nvcomp nanoarrow zstd rtcx)
 
   foreach(METADATA_KIND IN LISTS METADATA_KINDS)
     foreach(dep IN LISTS dependencies)
@@ -443,18 +440,13 @@ if(NOT BUILD_SHARED_LIBS)
   if(TARGET conda_env)
     install(TARGETS conda_env EXPORT cudf-exports)
   endif()
-  install(
-    TARGETS rtcx
-    EXPORT cudf-exports
-    DESTINATION ${lib_dir}
-  )
 endif()
 
 rtcx_add_embed(cudf_cuda_embed)
 
 rtcx_embed_includes(
-  cudf_cuda_embed SOURCE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/librtcx/libcxx DEST_DIRECTORY
-  librtcx/libcxx INCLUDE_DIRECTORIES librtcx/libcxx
+  cudf_cuda_embed SOURCE_DIRECTORY ${rtcx_SOURCE_DIR}/libcxx DEST_DIRECTORY librtcx/libcxx
+  INCLUDE_DIRECTORIES librtcx/libcxx
 )
 
 rtcx_embed_includes(
@@ -1215,7 +1207,6 @@ target_include_directories(
           "$<BUILD_INTERFACE:${nanoarrow_SOURCE_DIR}/src>"
           "$<BUILD_INTERFACE:${FlatBuffers_SOURCE_DIR}/include>"
           "$<BUILD_INTERFACE:${ZSTD_INCLUDE_DIR}>"
-          "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/librtcx>"
           "$<BUILD_INTERFACE:${cudf_cuda_embed_INCLUDE_DIRS}>"
           "$<BUILD_INTERFACE:${cudf_fragments_INCLUDE_DIRS}>"
   INTERFACE "$<INSTALL_INTERFACE:include>"

cpp/cmake/thirdparty/get_rtcx.cmake

@@ -0,0 +1,32 @@
+# cmake-format: off
+# SPDX-FileCopyrightText: Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+# cmake-format: on
+
+# This function finds rtcx
+function(find_and_configure_rtcx VERSION)
+
+  # Ensure rtcx installs its targets unconditionally. In shared builds the static library is
+  # absorbed into libcudf.so, but CMake still requires the target to be in an export set for
+  # install(EXPORT) validation. In static builds consumers need to link librtcx.a directly.
+  set(RTCX_INSTALL ON)
+
+  rapids_cpm_find(
+    rtcx ${VERSION}
+    GLOBAL_TARGETS rtcx::rtcx
+    CPM_ARGS
+    GIT_REPOSITORY https://github.com/rapidsai/librtcx.git
+    GIT_TAG efad266c1fd9de6d8486c6ba71bfa74df063eb1f
+    GIT_SHALLOW FALSE
+    EXCLUDE_FROM_ALL ${CUDF_EXCLUDE_DEPS_FROM_ALL}
+  )
+
+  # When CPM fetches from source (add_subdirectory), embed.cmake is not auto-included. Include it
+  # explicitly so add_embed/embed_includes/embed functions are available.
+  if(rtcx_ADDED OR DEFINED CPM_rtcx_SOURCE)
+    include("${rtcx_SOURCE_DIR}/embed.cmake")
+  endif()
+endfunction()
+
+set(RTCX_MIN_VERSION_cudf "0.1")
+find_and_configure_rtcx(${RTCX_MIN_VERSION_cudf})