👷 add step for NVCC build #2676

.github/workflows/ubuntu.yml

@@ -101,3 +101,13 @@ jobs:
         run: cmake -S . -B build -DJSON_CI=On
       - name: build
         run: cmake --build build --target ci_test_${{ matrix.compiler }}_cxx${{ matrix.standard }}
+
+  ci_cuda_example:
+    runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:main
+    steps:
+      - uses: actions/checkout@v2
+      - name: cmake
+        run: cmake -S . -B build -DJSON_CI=On
+      - name: build
+        run: cmake --build build --target ci_cuda_example

cmake/ci.cmake

@@ -835,6 +835,18 @@ foreach(COMPILER g++-4.8 g++-4.9 g++-5 g++-6 g++-7 g++-8 g++-9 g++-10 clang++-3.
     unset(COMPILER_TOOL CACHE)
 endforeach()
 
+###############################################################################
+# CUDA example
+###############################################################################
+
+add_custom_target(ci_cuda_example
+    COMMAND ${CMAKE_COMMAND}
+        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_CUDA_HOST_COMPILER=g++-8
+        -S${PROJECT_SOURCE_DIR}/test/cuda_example -B${PROJECT_BINARY_DIR}/build_cuda_example
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_cuda_example
+)
+
 ###############################################################################
 # Clean up all generated files.
 ###############################################################################

test/cuda_example/CMakeLists.txt

@@ -1,12 +1,10 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.18)
-project(json_cuda LANGUAGES CXX CUDA)
+project(json_cuda LANGUAGES CUDA)
 
-add_executable(json_cuda json_cuda.cpp)
+add_executable(json_cuda json_cuda.cu)
-set_source_files_properties(json_cuda.cpp PROPERTIES LANGUAGE CUDA)
 target_include_directories(json_cuda PRIVATE ../../include)
 target_compile_features(json_cuda PUBLIC cuda_std_11)
 set_target_properties(json_cuda PROPERTIES
     CUDA_EXTENSIONS OFF
     CUDA_STANDARD_REQUIRED ON
-    CUDA_SEPARABLE_COMPILATION ON  # Just needed if we need separable compilation; this adds -dc
 )

test/cuda_example/json_cuda.cpp

@@ -1,4 +0,0 @@
-#include <nlohmann/json.hpp>
-
-int main()
-{}

test/cuda_example/json_cuda.cu

@@ -0,0 +1,7 @@
+#include <nlohmann/json.hpp>
+
+int main()
+{
+    nlohmann::ordered_json json = {"Test"};
+    json.dump();
+}