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1# We can find some usecases which follow the guide of CMake which uses
2# `enable_language(CUDA)` instead of `find_package(CUDA)` and let the CMake
3# built-in functions use NVCC.
4
5# See: https://cmake.org/cmake/help/latest/module/FindCUDA.html#replacement
6#
7# However, this requires CMake version 3.10 or higher and we can't be sure most
8# of the CUDA projects are using those.
9#
10# This test relies on `find_package(CUDA)` in the parent CMake config.
11
12# These can be updated when NVCC becomes ready for C++ 17 features
13# https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#cpp14-language-features
14set(CMAKE_CUDA_STANDARD 14)
15set(CMAKE_CUDA_STANDARD_REQUIRED 14)
16
17# In this test, we assume that the user is going to compile CUDA source code
18# with some libraries (fmt in this case).
19#
20# In addition to that, this test invokes both the C++ host compiler and NVCC
21# by providing another (non-CUDA) C++ source code.
22if (${CMAKE_VERSION} VERSION_LESS 3.15)
23  # https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html
24  list(APPEND CUDA_NVCC_FLAGS "-std=c++14")
25  if (MSVC)
26    # This is the solution of pytorch:
27    # https://github.com/pytorch/pytorch/pull/7118
28    list(APPEND CUDA_NVCC_FLAGS "-Xcompiler" "/std:c++14")
29    list(APPEND CUDA_NVCC_FLAGS "-Xcompiler" "/Zc:__cplusplus")
30    # for the reason of this -Xcompiler options, see below.
31  endif ()
32  cuda_add_executable(fmt-in-cuda-test cuda-cpp14.cu cpp14.cc)
33  target_compile_features(fmt-in-cuda-test PRIVATE cxx_std_14)
34  if (MSVC)
35    # This part is for (non-CUDA) C++ code. MSVC can define incorrect
36    # `__cplusplus` macro. Fix for the issue is to use additional compiler flag.
37    #
38    # See Also:
39    # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
40    # https://github.com/Microsoft/vscode-cpptools/issues/2595
41    target_compile_options(fmt-in-cuda-test PRIVATE /Zc:__cplusplus /permissive-)
42  endif ()
43else()
44  # now using a "new" way of handling CUDA
45  add_executable(fmt-in-cuda-test cuda-cpp14.cu cpp14.cc)
46  set_target_properties(fmt-in-cuda-test PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
47  target_compile_features(fmt-in-cuda-test PRIVATE cxx_std_14)
48  if (MSVC)
49    # with MSVC, 'cxx_std_14' will only propagate to the host code (MSVC), but will
50    # not set __cplusplus correctly anyway, while nvcc will ignore it.
51    # If specified for nvcc on the command line as '-std=c++14' nvcc will emit this
52    # message instead:
53    # nvcc warning : The -std=c++14 flag is not supported with the configured host
54    #                compiler. Flag will be ignored.
55    set_property(SOURCE cuda-cpp14.cu APPEND PROPERTY
56      COMPILE_OPTIONS -Xcompiler /std:c++14 -Xcompiler /Zc:__cplusplus)
57    set_property(SOURCE cpp14.cc APPEND PROPERTY
58      COMPILE_OPTIONS /std:c++14 /Zc:__cplusplus)
59  endif()
60endif()
61
62get_target_property(IN_USE_CUDA_STANDARD fmt-in-cuda-test CUDA_STANDARD)
63message(STATUS "cuda_standard:          ${IN_USE_CUDA_STANDARD}")
64
65get_target_property(IN_USE_CUDA_STANDARD_REQUIRED
66    fmt-in-cuda-test CUDA_STANDARD_REQUIRED)
67message(STATUS "cuda_standard_required: ${IN_USE_CUDA_STANDARD_REQUIRED}")
68
69# We don't use PUBLIC or other keyword for reasons explained in the
70# CUDA_LINK_LIBRARIES_KEYWORD section in
71# https://cmake.org/cmake/help/latest/module/FindCUDA.html
72target_link_libraries(fmt-in-cuda-test fmt::fmt)
73
74