Fix libclang download for Rust, CUDA initialization for C tests (rapidsai#1652)

Searching in `/opt/conda` for libclang was causing it to sometimes find libclang in the package directory instead of the environment. Search the environment only.

Also initialize CUDA architectures for C tests in case `$CUDAARCHS` is set to `RAPIDS`.

Authors:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)

Approvers:
  - Divye Gala (https://github.com/divyegala)
  - Dante Gama Dessavre (https://github.com/dantegd)
  - Bradley Dice (https://github.com/bdice)

URL: rapidsai#1652

Author: KyleFromNVIDIA

.github/workflows/publish-rust.yaml

@@ -44,7 +44,7 @@ jobs:
           conda activate rust
           set -eu
 
-          LIBCLANG_PATH=$(dirname "$(find /opt/conda -name libclang.so | head -n 1)")
+          LIBCLANG_PATH=$(dirname "$(find "$CONDA_PREFIX" -name libclang.so | head -n 1)")
           export LIBCLANG_PATH
           echo "LIBCLANG_PATH=$LIBCLANG_PATH"
 

c/CMakeLists.txt

@@ -201,6 +201,8 @@ endif()
 # ##################################################################################################
 # * build tests ----------------------------------------------------
 if(BUILD_TESTS)
+  include(rapids-cuda)
+  rapids_cuda_init_architectures(CUVS_C)
   enable_language(CUDA)
   find_package(CUDAToolkit REQUIRED)
 

ci/build_docs.sh

@@ -45,7 +45,7 @@ popd
 
 rapids-logger "Build Rust docs"
 pushd rust
-LIBCLANG_PATH=$(dirname "$(find /opt/conda -name libclang.so | head -n 1)")
+LIBCLANG_PATH=$(dirname "$(find "$CONDA_PREFIX" -name libclang.so | head -n 1)")
 export LIBCLANG_PATH
 cargo doc -p cuvs --no-deps
 popd

ci/build_rust.sh

@@ -44,7 +44,7 @@ sccache --stop-server 2>/dev/null || true
 
 # we need to set up LIBCLANG_PATH to allow rust bindgen to work,
 # grab it from the conda env
-LIBCLANG_PATH=$(dirname "$(find /opt/conda -name libclang.so | head -n 1)")
+LIBCLANG_PATH=$(dirname "$(find "$CONDA_PREFIX" -name libclang.so | head -n 1)")
 export LIBCLANG_PATH
 echo "LIBCLANG_PATH=$LIBCLANG_PATH"
 

examples/rust/README.md

@@ -16,7 +16,7 @@ You may prefer to use `mamba`, as it provides significant speedup over `conda`.
 
 1. Set up the required environment variables:
 ```bash
-LIBCLANG_PATH=$(dirname "$(find /opt/conda -name libclang.so | head -n 1)")
+LIBCLANG_PATH=$(dirname "$(find "$CONDA_PREFIX" -name libclang.so | head -n 1)")
 export LIBCLANG_PATH
 echo "LIBCLANG_PATH=$LIBCLANG_PATH"
 ```