try using grpc package from conda forge for conda builds

previous workaround of build from source is not necessary since
a bug with libabseil has been fixed

Author: tmckayus

conda/environments/all_cuda-129_arch-aarch64.yaml

@@ -28,11 +28,14 @@ dependencies:
 - gcc_linux-aarch64=14.*
 - ipython
 - jsonref==1.1.0
+- libabseil
 - libboost-devel
 - libcudss-dev >=0.7
 - libcurand-dev
 - libcusolver-dev
 - libcusparse-dev
+- libgrpc
+- libprotobuf
 - libraft-headers==26.4.*,>=0.0.0a0
 - librmm==26.4.*,>=0.0.0a0
 - make
@@ -60,6 +63,7 @@ dependencies:
 - pyyaml>=6.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - rapids-logger==0.2.*,>=0.0.0a0
+- re2
 - requests
 - rmm==26.4.*,>=0.0.0a0
 - scikit-build-core>=0.11.0

conda/environments/all_cuda-129_arch-x86_64.yaml

@@ -28,11 +28,14 @@ dependencies:
 - gcc_linux-64=14.*
 - ipython
 - jsonref==1.1.0
+- libabseil
 - libboost-devel
 - libcudss-dev >=0.7
 - libcurand-dev
 - libcusolver-dev
 - libcusparse-dev
+- libgrpc
+- libprotobuf
 - libraft-headers==26.4.*,>=0.0.0a0
 - librmm==26.4.*,>=0.0.0a0
 - make
@@ -60,6 +63,7 @@ dependencies:
 - pyyaml>=6.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - rapids-logger==0.2.*,>=0.0.0a0
+- re2
 - requests
 - rmm==26.4.*,>=0.0.0a0
 - scikit-build-core>=0.11.0

conda/environments/all_cuda-131_arch-aarch64.yaml

@@ -28,11 +28,14 @@ dependencies:
 - gcc_linux-aarch64=14.*
 - ipython
 - jsonref==1.1.0
+- libabseil
 - libboost-devel
 - libcudss-dev >=0.7
 - libcurand-dev
 - libcusolver-dev
 - libcusparse-dev
+- libgrpc
+- libprotobuf
 - libraft-headers==26.4.*,>=0.0.0a0
 - librmm==26.4.*,>=0.0.0a0
 - make
@@ -60,6 +63,7 @@ dependencies:
 - pyyaml>=6.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - rapids-logger==0.2.*,>=0.0.0a0
+- re2
 - requests
 - rmm==26.4.*,>=0.0.0a0
 - scikit-build-core>=0.11.0

conda/environments/all_cuda-131_arch-x86_64.yaml

@@ -28,11 +28,14 @@ dependencies:
 - gcc_linux-64=14.*
 - ipython
 - jsonref==1.1.0
+- libabseil
 - libboost-devel
 - libcudss-dev >=0.7
 - libcurand-dev
 - libcusolver-dev
 - libcusparse-dev
+- libgrpc
+- libprotobuf
 - libraft-headers==26.4.*,>=0.0.0a0
 - librmm==26.4.*,>=0.0.0a0
 - make
@@ -60,6 +63,7 @@ dependencies:
 - pyyaml>=6.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - rapids-logger==0.2.*,>=0.0.0a0
+- re2
 - requests
 - rmm==26.4.*,>=0.0.0a0
 - scikit-build-core>=0.11.0

conda/recipes/libcuopt/recipe.yaml

@@ -29,14 +29,7 @@ cache:
         export CXXFLAGS=$(echo $CXXFLAGS | sed -E 's@\-fdebug\-prefix\-map[^ ]*@@g')
         set +x
 
-        # Workaround for abseil-cpp#1624: Mutex::Dtor() not exported from shared libabseil on Linux.
-        # Build gRPC/Protobuf/Abseil from source to ensure consistent ABI and avoid symbol issues.
-        GRPC_INSTALL_DIR="${SRC_DIR}/grpc_install"
-
-        bash ./ci/utils/install_protobuf_grpc.sh --prefix="${GRPC_INSTALL_DIR}" --build-dir="${SRC_DIR}" --skip-deps
-
-        export CMAKE_PREFIX_PATH="${GRPC_INSTALL_DIR}:${CMAKE_PREFIX_PATH:-}"
-        ./build.sh -n -v ${BUILD_EXTRA_FLAGS} libmps_parser libcuopt deb --allgpuarch --cmake-args=\"-DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_PREFIX_PATH=${GRPC_INSTALL_DIR}\"
+        ./build.sh -n -v ${BUILD_EXTRA_FLAGS} libmps_parser libcuopt deb --allgpuarch --cmake-args=\"-DCMAKE_INSTALL_LIBDIR=lib\"
       secrets:
         - AWS_ACCESS_KEY_ID
         - AWS_SECRET_ACCESS_KEY
@@ -100,6 +93,10 @@ cache:
       - bzip2
       - openssl
       - c-ares
+      - libgrpc
+      - libprotobuf
+      - libabseil
+      - re2
 
 outputs:
   - package:
@@ -177,6 +174,10 @@ outputs:
         - openssl
         - c-ares
         - libuuid
+        - libgrpc
+        - libprotobuf
+        - libabseil
+        - re2
       run:
         - ${{ pin_compatible("cuda-version", upper_bound="x", lower_bound="x") }}
         - ${{ pin_subpackage("libmps-parser", exact=True) }}
@@ -187,6 +188,9 @@ outputs:
         - openssl
         - c-ares
         - libuuid
+        - libgrpc
+        - libprotobuf
+        - libabseil
       ignore_run_exports:
         by_name:
           - cuda-nvtx
@@ -231,6 +235,9 @@ outputs:
         - libcusparse-dev
         - openssl
         - c-ares
+        - libgrpc
+        - libprotobuf
+        - libabseil
       run:
         - ${{ pin_subpackage("libcuopt", exact=True) }}
         - ${{ pin_subpackage("libmps-parser", exact=True) }}

cpp/CMakeLists.txt

@@ -111,9 +111,14 @@ endif(BUILD_MSAN)
 
 # Note: -UNDEBUG is applied via CUOPT_CXX_FLAGS / CUOPT_CUDA_FLAGS (not add_definitions)
 # to avoid leaking into dependencies that are built in-tree.
+#
+# For CXX: -UNDEBUG is applied per-source-file (not target-wide) to exclude gRPC
+# infrastructure files. Those files include abseil headers, and abseil's shared library
+# on conda-forge doesn't export Mutex::Dtor() in NDEBUG builds (abseil-cpp#1624).
+# Keeping NDEBUG defined for gRPC files makes the header inline an empty Dtor(),
+# avoiding the missing symbol at runtime.
 if(DEFINE_ASSERT)
   add_definitions(-DASSERT_MODE)
-  list(APPEND CUOPT_CXX_FLAGS -UNDEBUG)
   list(APPEND CUOPT_CUDA_FLAGS -UNDEBUG)
 endif(DEFINE_ASSERT)
 
@@ -348,6 +353,14 @@ if (HOST_LINEINFO)
   set_source_files_properties(${CUOPT_SRC_FILES} DIRECTORY ${CMAKE_SOURCE_DIR} PROPERTIES COMPILE_OPTIONS "-g1")
 endif()
 
+# Apply -UNDEBUG only to solver source files (not gRPC infrastructure).
+# Must happen before gRPC files are appended to CUOPT_SRC_FILES.
+# Uses APPEND to preserve any existing per-file options (e.g. -g1 from HOST_LINEINFO).
+if(DEFINE_ASSERT)
+  set_property(SOURCE ${CUOPT_SRC_FILES} DIRECTORY ${CMAKE_SOURCE_DIR}
+    APPEND PROPERTY COMPILE_OPTIONS "-UNDEBUG")
+endif()
+
 # Add gRPC mapper files and generated protobuf sources
 list(APPEND CUOPT_SRC_FILES
   ${PROTO_SRCS}

dependencies.yaml

@@ -304,6 +304,10 @@ dependencies:
           - bzip2
           - openssl
           - c-ares
+          - libgrpc
+          - libprotobuf
+          - libabseil
+          - re2
   test_cpp:
     common:
       - output_types: [conda]