Regards #558: Some more tweaks involving the NVIDIA PTX compiler library

* Not trying to create the `nvptxcompiler` and `nvptxcompiler_static targets if they already exist
* Some code duplication avoidance

CMakeLists.txt

@@ -19,8 +19,11 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "lib/")
 find_package(CUDAToolkit 9.0 REQUIRED)
 find_package(Threads REQUIRED)
 if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 11.1)
-	_CUDAToolkit_find_and_add_import_lib(nvptxcompiler)
-	_CUDAToolkit_find_and_add_import_lib(nvptxcompiler_static)
+	foreach(tgt in nvptxcompiler nvptxcompiler_static)
+		if (NOT TARGET ${tgt})
+			_CUDAToolkit_find_and_add_import_lib(${tgt})
+		endif()
+	endforeach()
 endif()
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 
@@ -60,10 +63,11 @@ endforeach()
 target_link_libraries(caw_rtc INTERFACE cuda-api-wrappers::runtime-and-driver CUDA::nvrtc)
 if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 11.1)
 	if (TARGET CUDA::nvptxcompiler)
-		target_link_libraries(caw_rtc INTERFACE CUDA::nvptxcompiler)
+		set(ptx_compiler_target nvptxcompiler)
 	else()
-		target_link_libraries(caw_rtc INTERFACE CUDA::nvptxcompiler_static)
+		set(ptx_compiler_target nvptxcompiler_static)
 	endif()
+	target_link_libraries(caw_rtc INTERFACE CUDA::${ptx_compiler_target})
 	target_link_libraries(caw_rtc INTERFACE Threads::Threads) # Because the NVIDIA PTX compiler itself uses threads
 endif()