c++ - CUDA 8 编译错误 -std=gnu++11

Question

我正在尝试转换一些代码以使用 CUDA，但我认为我遇到了兼容性问题。我们使用CMake。这些是我使用的 gcc 和 CUDA 版本:

$ gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.5) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2016 NVIDIA Corporation
Built on Tue_Jan_10_13:22:03_CST_2017
Cuda compilation tools, release 8.0, V8.0.61

在 CMakeLists.txt 文件中，这样设置:

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")

当我编译时，我得到这个错误:

/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h(436): error: identifier "nullptr" is undefined

/usr/lib/gcc/x86_64-linux-gnu/5/include/stddef.h(436): error: expected a ";"

/usr/include/x86_64-linux-gnu/c++/5/bits/c++config.h(200): error: expected a ";"

/usr/include/c++/5/exception(63): error: expected a ";"

/usr/include/c++/5/exception(68): error: expected a ";"

/usr/include/c++/5/exception(76): error: expected a ";"

/usr/include/c++/5/exception(83): error: expected a ";"

/usr/include/c++/5/exception(93): error: expected a "{"
...

我找到了 this discussion ，它表示将 C++ 标志更改为 -std=c++98 ，但这对项目不起作用，因为它广泛使用了 C++11 代码。有解决办法吗？这似乎不是一个独特的问题，但我似乎找不到解决方案...

这是我运行 cmake 时的输出，所以我知道它确实使用了 gcc 5.4 而不是其他版本。

-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Found CUDA: /usr/local/cuda (found version "8.0") 
-- Found OpenCV: /usr/local (found version "3.2.0") 
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython2.7.so (found suitable version "2.7.12", minimum required is "2.7") 
-- Found PythonInterp: /usr/bin/python2.7 (found version "2.7.12") 
-- Boost version: 1.58.0
-- Found the following Boost libraries:
--   python
-- Configuring done
-- Generating

Answer 1

如果您愿意需要更新版本的 CMake，则更便携的解决方案是

cmake_minimum_required(VERSION 3.1.3)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)  # not necessary, but encouraged

我大约 90% 确定它与 v3.1.3 一起出现.确保在创建任何特定目标(例如，cuda_add_library 或 cuda_add_executable) 之前设置此项。

另请注意，如果您使用的是传统的 find_package(CUDA) 和 cuda_add_library 等，您可能还需要

set(CUDA_PROPAGATE_HOST_FLAGS ON)

否则 nvcc 默认不继承这些定义。