Add symbol visibility checks

ci/check_symbols.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: Copyright (c) 2026, NVIDIA CORPORATION.
+# SPDX-License-Identifier: Apache-2.0
+
+set -eEuo pipefail
+
+echo "checking for symbol visibility issues"
+
+LIBRARY="${1}"
+
+echo ""
+echo "Checking exported symbols in '${LIBRARY}'"
+symbol_file="$(mktemp)"
+readelf --dyn-syms --wide "${LIBRARY}" \
+    | awk '$7 != "UND"' \
+    | c++filt \
+    > "${symbol_file}"
+
+patterns=(
+    'cub::'
+    'thrust::'
+    'raft::'
+    'rmm::'
+    'cuopt::linear_programming::detail'
+    'cuopt::routing::detail'
+    'grpc::'
+    'google::protobuf'
+    'tbb::'
+)
+
+for pattern in "${patterns[@]}"; do
+    echo "Checking for '${pattern}' symbols..."
+    matches=$(grep -F -c "${pattern}" "${symbol_file}" || true)
+    if [[ "${matches}" -ne 0 ]]; then
+        grep -F -m 20 "${pattern}" "${symbol_file}"
+        echo "ERROR: Found exported symbols in ${LIBRARY} matching the pattern ${pattern}."
+        echo "ERROR: Total matching symbols: ${matches}"
+        rm "${symbol_file}"
+        exit 1
+    fi
+done
+
+rm "${symbol_file}"
+echo "No symbol visibility issues found in ${LIBRARY}"

conda/recipes/libcuopt/recipe.yaml

@@ -106,6 +106,7 @@ outputs:
       script:
         content: |
           cmake --install cpp/libmps_parser/build
+          ./ci/check_symbols.sh "$PREFIX/lib/libmps_parser.so"
       dynamic_linking:
         overlinking_behavior: "error"
       prefix_detection:
@@ -159,6 +160,7 @@ outputs:
       script:
         content: |
           cmake --install cpp/build
+          ./ci/check_symbols.sh "$PREFIX/lib/libcuopt.so"
       dynamic_linking:
         overlinking_behavior: "error"
       prefix_detection:

cpp/CMakeLists.txt

@@ -185,9 +185,6 @@ message("-- Host target architecture = '${CMAKE_SYSTEM_PROCESSOR}'")
 
 # make the flags global in order to propagate flags to test cmake files
 set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} --expt-relaxed-constexpr --expt-extended-lambda")
-if (${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER_EQUAL 12.9)
-    set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -static-global-template-stub=false")
-endif ()
 list(APPEND CUOPT_CUDA_FLAGS -Werror=cross-execution-space-call -Wno-deprecated-declarations -Xcompiler=-Werror --default-stream=per-thread)
 if ("${CMAKE_CUDA_HOST_COMPILER}" MATCHES "clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     list(APPEND CUOPT_CUDA_FLAGS -Xcompiler=-Wall)
@@ -435,6 +432,8 @@ if (NOT SKIP_GRPC_BUILD)
     # at runtime with "undefined symbol: absl::…::Mutex::Dtor".
     set_property(SOURCE ${GRPC_INFRA_FILES} DIRECTORY ${CMAKE_SOURCE_DIR}
             APPEND PROPERTY COMPILE_OPTIONS "-DNDEBUG")
+    set_property(SOURCE ${PROTO_SRCS} ${GRPC_PROTO_SRCS} ${GRPC_SERVICE_SRCS} DIRECTORY ${CMAKE_SOURCE_DIR}
+            APPEND PROPERTY COMPILE_OPTIONS "$<$<COMPILE_LANGUAGE:CXX>:-fvisibility=default>")
 endif (NOT SKIP_GRPC_BUILD)
 
 add_library(cuopt SHARED
@@ -448,6 +447,14 @@ set_target_properties(cuopt
         CXX_SCAN_FOR_MODULES OFF
 )
 
+if (NOT BUILD_TESTS)
+    set_target_properties(cuopt
+            PROPERTIES CXX_VISIBILITY_PRESET hidden
+            CUDA_VISIBILITY_PRESET hidden
+            VISIBILITY_INLINES_HIDDEN ON
+    )
+endif ()
+
 target_compile_definitions(cuopt PUBLIC "CUOPT_LOG_ACTIVE_LEVEL=RAPIDS_LOGGER_LOG_LEVEL_${LIBCUOPT_LOGGING_LEVEL}")
 
 target_compile_options(cuopt

cpp/include/cuopt/common/export.hpp

@@ -0,0 +1,14 @@
+/* clang-format off */
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/* clang-format on */
+
+#pragma once
+
+#if defined(__GNUC__) || defined(__clang__)
+#define CUOPT_EXPORT __attribute__((visibility("default")))
+#else
+#define CUOPT_EXPORT
+#endif

cpp/include/cuopt/linear_programming/backend_selection.hpp

@@ -7,7 +7,10 @@
 
 #pragma once
 
-namespace cuopt::linear_programming {
+#include <cuopt/common/export.hpp>
+
+namespace cuopt {
+namespace CUOPT_EXPORT linear_programming {
 
 /**
  * @brief Enum for execution mode (local vs remote solve)
@@ -61,4 +64,5 @@ bool use_cpu_memory_for_local();
  */
 memory_backend_t get_memory_backend_type();
 
-}  // namespace cuopt::linear_programming
+}  // namespace CUOPT_EXPORT linear_programming
+}  // namespace cuopt

cpp/include/cuopt/linear_programming/cpu_optimization_problem.hpp

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <cuopt/common/export.hpp>
 #include <cuopt/linear_programming/optimization_problem_interface.hpp>
 
 #include <raft/core/handle.hpp>
@@ -17,7 +18,8 @@
 #include <string>
 #include <vector>
 
-namespace cuopt::linear_programming {
+namespace cuopt {
+namespace CUOPT_EXPORT linear_programming {
 
 // Forward declarations
 template <typename i_t, typename f_t>
@@ -206,4 +208,5 @@ class cpu_optimization_problem_t : public optimization_problem_interface_t<i_t,
   std::vector<std::string> row_names_{};
 };
 
-}  // namespace cuopt::linear_programming
+}  // namespace CUOPT_EXPORT linear_programming
+}  // namespace cuopt

cpp/include/cuopt/linear_programming/cpu_optimization_problem_solution.hpp

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <cuopt/common/export.hpp>
 #include <cuopt/linear_programming/cpu_pdlp_warm_start_data.hpp>
 #include <cuopt/linear_programming/mip/solver_solution.hpp>
 #include <cuopt/linear_programming/mip/solver_stats.hpp>
@@ -18,7 +19,8 @@
 
 #include <vector>
 
-namespace cuopt::linear_programming {
+namespace cuopt {
+namespace CUOPT_EXPORT linear_programming {
 
 /**
  * @brief CPU-backed LP solution (uses std::vector instead of rmm::device_uvector)
@@ -389,4 +391,5 @@ class cpu_mip_solution_t : public mip_solution_interface_t<i_t, f_t> {
   i_t num_simplex_iterations_;
 };
 
-}  // namespace cuopt::linear_programming
+}  // namespace CUOPT_EXPORT linear_programming
+}  // namespace cuopt

cpp/include/cuopt/linear_programming/cpu_pdlp_warm_start_data.hpp

@@ -7,10 +7,12 @@
 
 #pragma once
 
+#include <cuopt/common/export.hpp>
 #include <cuopt/linear_programming/pdlp/pdlp_warm_start_data.hpp>
 #include <vector>
 
-namespace cuopt::linear_programming {
+namespace cuopt {
+namespace CUOPT_EXPORT linear_programming {
 
 // CPU version of pdlp_warm_start_data_t using std::vector for remote execution
 template <typename i_t, typename f_t>
@@ -118,4 +120,5 @@ template <typename i_t, typename f_t>
 pdlp_warm_start_data_t<i_t, f_t> convert_to_gpu_warmstart(
   const cpu_pdlp_warm_start_data_t<i_t, f_t>& cpu_data, rmm::cuda_stream_view stream);
 
-}  // namespace cuopt::linear_programming
+}  // namespace CUOPT_EXPORT linear_programming
+}  // namespace cuopt