[CMake] CUDA language support with host compiler flags

[Máté Ferenc Nagy-Egri via CMake]

Hi All!

I am trying to compile CUDA code with controlling both host and device 
compiler flags.

Currently my CMakeLists.txt looks like:

```
cmake_minimum_required(VERSION 3.8) # CUDA language support

project(CUDA_test LANGUAGES CXX CUDA)

if (MSVC)
   string(REGEX REPLACE "/W[0-9]" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
endif (MSVC)

set(Hdrs)

set(Srcs Main.cu)

add_executable(${PROJECT_NAME} ${Hdrs} ${Srcs})

target_include_directories(${PROJECT_NAME} PRIVATE 
${CMAKE_CURRENT_SOURCE_DIR})

target_compile_options(${PROJECT_NAME} PRIVATE 
$<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>>:-Wall -Wextra 
-pedantic>
$<$<CXX_COMPILER_ID:MSVC>:/W4>)

set_target_properties(${PROJECT_NAME} PROPERTIES 
CUDA_SEPARABLE_COMPILATION ON
                                                  CUDA_STANDARD 14
CUDA_STANDARD_REQUIRED ON
CUDA_EXTENSIONS OFF
                                                  CXX_STANDARD 14
CXX_STANDARD_REQUIRED ON
CXX_EXTENSIONS OFF)

source_group ("Headers" FILES ${Hdrs})
source_group ("Sources" FILES ${Srcs})
```

However, when I compile the code I get the following error:

[1/3] Building CUDA object CMakeFiles/CUDA_test.dir/Main.cu.o
FAILED: CMakeFiles/CUDA_test.dir/Main.cu.o
/usr/bin/nvcc 
-I/var/tmp/src/e75971a9-7e91-6137-abfa-df34048cc171/GCC-Debug-WSL -g   
-Wall -Wextra -pedantic -std=c++14 -x cu -dc 
/var/tmp/src/e75971a9-7e91-6137-abfa-df34048cc171/GCC-Debug-WSL/Main.cu 
-o CMakeFiles/CUDA_test.dir/Main.cu.o && /usr/bin/nvcc 
-I/var/tmp/src/e75971a9-7e91-6137-abfa-df34048cc171/GCC-Debug-WSL -g   
-Wall -Wextra -pedantic -std=c++14 -x cu -M 
/var/tmp/src/e75971a9-7e91-6137-abfa-df34048cc171/GCC-Debug-WSL/Main.cu 
-MT CMakeFiles/CUDA_test.dir/Main.cu.o -o 
CMakeFiles/CUDA_test.dir/Main.cu.o.d
nvcc fatal   : Unknown option 'Wall'
ninja: build stopped: subcommand failed.

CMake seems to pass -Wall -Wextra -pedantic to the device compiler as 
well, even though it is neither GNU nor Clang, but CUDA. How can I 
specify warning and similar flags separatly for the host and device 
compilers?
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