【发布时间】：2018-12-21 06:28:44
【问题描述】：
当我尝试 OpenPose Building 时，我收到错误：标识符“nullptr”未定义。
我按照网站上的说明安装 OpenPose 在“OpenPose Building”中出现错误。 https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/doc/installation.md#clone-openpose
my@PC:~/openpose/build$ make -j`nproc`
Scanning dependencies of target openpose_caffe
[ 12%] Creating directories for 'openpose_caffe'
[ 25%] No download step for 'openpose_caffe'
[ 37%] [ 50%] No patch step for 'openpose_caffe'
No update step for 'openpose_caffe'
[ 62%] Performing configure step for 'openpose_caffe'
-- The C compiler identification is GNU 4.9.4
-- The CXX compiler identification is GNU 4.9.4
-- 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
-- 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
-- Boost version: 1.54.0
-- Found the following Boost libraries:
-- system
-- thread
-- filesystem
-- Looking for include file pthread.h
-- Looking for include file 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 GFlags: /usr/include
-- Found gflags (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libgflags.so)
-- Found Glog: /usr/include
-- Found glog (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libglog.so)
-- Found PROTOBUF: /usr/lib/x86_64-linux-gnu/libprotobuf.so
-- Found PROTOBUF Compiler: /usr/bin/protoc
-- Found HDF5: /usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so
-- CUDA detected: 8.0
-- Found cuDNN: ver. 5.1.10 found (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libcudnn.so)
-- Automatic GPU detection failed. Building for all known architectures.
-- Added CUDA NVCC flags for: sm_30 sm_35 sm_50 sm_52 sm_60 sm_61
-- Found Atlas: /usr/include
-- Found Atlas (include: /usr/include library: /usr/lib/libatlas.so lapack: /usr/lib/liblapack.so
-- Python interface is disabled or not all required dependencies found. Building without it...
-- Found Git: /usr/bin/git (found version "1.9.1")
--
-- ******************* Caffe Configuration Summary *******************
-- General:
-- Version : 1.0.0
-- Git : 1.0-141-g974172c
-- System : Linux
-- C++ compiler : /usr/bin/c++
-- Release CXX flags : -O3 -DNDEBUG -fPIC -Wall -std=c++11 -Wno-sign-compare -Wno-uninitialized
-- Debug CXX flags : -g -fPIC -Wall -std=c++11 -Wno-sign-compare -Wno-uninitialized
-- Build type : Release
--
-- BUILD_SHARED_LIBS : ON
-- BUILD_python : OFF
-- BUILD_matlab : OFF
-- BUILD_docs : OFF
-- CPU_ONLY : OFF
-- USE_OPENCV : OFF
-- USE_LEVELDB : OFF
-- USE_LMDB : OFF
-- USE_NCCL : OFF
-- ALLOW_LMDB_NOLOCK : OFF
-- USE_HDF5 : ON
--
-- Dependencies:
-- BLAS : Yes (Atlas)
-- Boost : Yes (ver. 1.54)
-- glog : Yes
-- gflags : Yes
-- protobuf : Yes (ver. 2.5.0)
-- CUDA : Yes (ver. 8.0)
--
-- NVIDIA CUDA:
-- Target GPU(s) : Auto
-- GPU arch(s) : sm_30 sm_35 sm_50 sm_52 sm_60 sm_61
-- cuDNN : Yes (ver. 5.1.10)
--
-- Install:
-- Install path : /home/miyo/openpose/build/caffe
--
CMake Warning (dev) in src/caffe/CMakeLists.txt:
Policy CMP0022 is not set: INTERFACE_LINK_LIBRARIES defines the link
interface. Run "cmake --help-policy CMP0022" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.
Target "caffe" has an INTERFACE_LINK_LIBRARIES property which differs from
its LINK_INTERFACE_LIBRARIES properties.
INTERFACE_LINK_LIBRARIES:
caffeproto;/usr/lib/x86_64-linux-gnu/libboost_system.so;/usr/lib/x86_64-linux-gnu/libboost_thread.so;/usr/lib/x86_64-linux-gnu/libboost_filesystem.so;/usr/lib/x86_64-linux-gnu/libpthread.so;/usr/lib/x86_64-linux-gnu/libglog.so;/usr/lib/x86_64-linux-gnu/libgflags.so;$<$<NOT:$<CONFIG:DEBUG>>:/usr/lib/x86_64-linux-gnu/libprotobuf.so>;$<$<CONFIG:DEBUG>:/usr/lib/x86_64-linux-gnu/libprotobuf.so>;-lpthread;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/local/cuda-8.0/lib64/libcudart.so;/usr/local/cuda-8.0/lib64/libcurand.so;/usr/local/cuda-8.0/lib64/libcublas.so;/usr/lib/x86_64-linux-gnu/libcudnn.so;/usr/lib/liblapack.so;/usr/lib/libcblas.so;/usr/lib/libatlas.so
LINK_INTERFACE_LIBRARIES:
caffeproto;/usr/lib/x86_64-linux-gnu/libboost_system.so;/usr/lib/x86_64-linux-gnu/libboost_thread.so;/usr/lib/x86_64-linux-gnu/libboost_filesystem.so;/usr/lib/x86_64-linux-gnu/libpthread.so;/usr/lib/x86_64-linux-gnu/libglog.so;/usr/lib/x86_64-linux-gnu/libgflags.so;/usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/lib/x86_64-linux-gnu/libhdf5_hl.so;/usr/lib/x86_64-linux-gnu/libhdf5.so;/usr/local/cuda-8.0/lib64/libcudart.so;/usr/local/cuda-8.0/lib64/libcurand.so;/usr/local/cuda-8.0/lib64/libcublas.so;/usr/lib/x86_64-linux-gnu/libcudnn.so;/usr/lib/liblapack.so;/usr/lib/libcblas.so;/usr/lib/libatlas.so
This warning is for project developers. Use -Wno-dev to suppress it.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/miyo/openpose/build/caffe/src/openpose_caffe-build
[ 75%] Performing build step for 'openpose_caffe'
[ 1%] Running C++/Python protocol buffer compiler on /home/miyo/openpose/3rdparty/caffe/src/caffe/proto/caffe.proto
Scanning dependencies of target caffeproto
[ 1%] Building CXX object src/caffe/CMakeFiles/caffeproto.dir/__/__/include/caffe/proto/caffe.pb.cc.o
Linking CXX static library ../../lib/libcaffeproto.a
[ 1%] Built target caffeproto
[ 1%] [ 1%] [ 2%] [ 2%] [ 4%] [ 5%] [ 6%] [ 6%] [ 6%] Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_sgd_solver.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/util/./cuda_compile_generated_math_functions.cu.o
[ 6%] Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_adam_solver.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/layers/./cuda_compile_generated_deconv_layer.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/util/./cuda_compile_generated_im2col.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_adagrad_solver.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_rmsprop_solver.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_nesterov_solver.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/solvers/./cuda_compile_generated_adadelta_solver.cu.o
[ 8%] [ 8%] Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/layers/./cuda_compile_generated_lrn_layer.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/layers/./cuda_compile_generated_hdf5_data_layer.cu.o
Building NVCC (Device) object src/caffe/CMakeFiles/cuda_compile.dir/layers/./cuda_compile_generated_cudnn_sigmoid_layer.cu.o
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stddef.h(432): error: identifier "nullptr" is undefined
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stddef.h(432): error: expected a ";"
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stddef.h(432): error: identifier "nullptr" is undefined
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stddef.h(432): error: expected a ";"
...
/usr/include/c++/4.9/cmath(202): error: variable "std::constexpr" has already been defined
/usr/include/c++/4.9/cmath(202): error: expected a ";"
/usr/include/c++/4.9/cmath(221): error: inline specifier allowed on function declarations only
/usr/include/c++/4.9/cmath(221): error: variable "std::constexpr" has already been defined
/usr/include/c++/4.9/cmath(221): error: expected a ";"
/usr/include/c++/4.9/cmath(240): error: inline specifier allowed on function declarations only
/usr/include/c++/4.9/cmath(240): error: variable "std::constexpr" has already been defined
/usr/include/c++/4.9/cmath(240): error: expected a ";"
Error limit reached.
100 errors detected in the compilation of "/tmp/tmpxft_00001d71_00000000-17_math_functions.compute_61.cpp1.ii".
Compilation terminated.
CMake Error at cuda_compile_generated_math_functions.cu.o.cmake:264 (message):
Error generating file
/home/miyo/openpose/build/caffe/src/openpose_caffe-build/src/caffe/CMakeFiles/cuda_compile.dir/util/./cuda_compile_generated_math_functions.cu.o
make[5]: *** [src/caffe/CMakeFiles/cuda_compile.dir/util/./cuda_compile_generated_math_functions.cu.o] Error 1
make[4]: *** [src/caffe/CMakeFiles/caffe.dir/all] Error 2
make[3]: *** [all] Error 2
make[2]: *** [caffe/src/openpose_caffe-stamp/openpose_caffe-build] Error 2
make[1]: *** [CMakeFiles/openpose_caffe.dir/all] Error 2
make: *** [all] Error 2
请告诉我如何解决这个问题。
Ubuntu 14.04， 库达 8.0, cudnn 5.1, gcc 4.9, g++ 4.9
- 附加说明 -
我在这里多发。 https://github.com/CMU-Perceptual-Computing-Lab/openpose/issues/981 https://ja.stackoverflow.com/questions/51408/openpose%e3%81%ae%e3%83%93%e3%83%ab%e3%83%89%e6%99%82%e3%81%aberror-identifier-nullptr-is-undefined%e3%81%ae%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%8c%e7%99%ba%e7%94%9f%e3%81%99%e3%82%8b
我运行了以下代码，但无法改善这个问题。
sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade && sudo apt-get autoremove
-
补充说明２ -
我的@PC:~$ cc --version cc (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4 版权所有 (C) 2015 Free Software Foundation, Inc. 这是免费软件；查看复制条件的来源。没有 保修单;甚至不考虑适销性或特定用途的适用性。
my@PC:~$ c++ --version c++ (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4 版权所有 (C) 2015 Free Software Foundation, Inc. 这是免费软件；查看复制条件的来源。没有 保修单;甚至不考虑适销性或特定用途的适用性。
【问题讨论】：
-
考虑到您只为 C 编程语言标记了您的问题，C 中没有
nullptr关键字或标识符。但是因为它似乎您正在构建一个 C++ 项目（因此错过了您的问题）您使用的旧编译器默认使用旧版本的 C++ 标准，即未指定nullptr标识符的旧版本。要么更新你的编译器，要么向项目提交错误报告，告诉他们添加对 C++ 标准标志的检查。 -
您应该升级您的发行版。 Ubuntu 14 是古老的。 GCC 4.9 已经过时了。当前的 GCC 是 GCC8
-
@Someprogrammerdude 抱歉，标签“C”是输入错误。感谢您的评论。我对 gcc 和 g++ 都使用 4.9 版。我认为如果版本是 4.6 或更高版本，可以使用 nullptr。如果我的理解有任何错误，请告诉我。
-
@Basile Starynkevitch 对于以下站点中处理的类似问题，受访者建议使用 GCC 4.6 或 4.9。这也是 GCC 8 的问题吗？ github.com/torch/torch7/issues/682
-
@BasileStarynkevitch 我不会说 gcc 4.9 已经过时，因为当前的 RedHat 附带 4.8.5 并且官方存储库中没有更新。所以我很确定 4.8.5 广泛用于商业服务器和企业 linux。在 4.8.5 中，您可以使用 nullptr。