1 说明

在conda创建的虚拟环境中使用pybind11时出现问题。

1.1 cmake …

mkdir build cd build cmake ..

输出：

(py36_pytorch041) ➜ build git:(master) ✗ cmake .. -- The C compiler identification is AppleClang 10.0.1.10010046 -- The CXX compiler identification is AppleClang 10.0.1.10010046 -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/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: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Found PythonInterp: /Users/zhangxin/anaconda3/bin/python3.7 (found version "3.7") -- Found PythonLibs: /Users/zhangxin/anaconda3/lib/libpython3.7m.dylib -- Performing Test HAS_CPP14_FLAG -- Performing Test HAS_CPP14_FLAG - Success -- pybind11 v2.3.dev0 -- Performing Test HAS_FLTO -- Performing Test HAS_FLTO - Success -- LTO enabled -- Configuring done -- Generating done -- Build files have been written to: /Users/zhangxin/github/pybind11_examples/01_py-list_cpp-vector/build

【注意】Found PythonInterp和Found PythonLibs这两行。

1.2 make

make

输出：

(py36_pytorch041) ➜ build git:(master) ✗ make Scanning dependencies of target example [ 50%] Building CXX object CMakeFiles/example.dir/example.cpp.o [100%] Linking CXX shared module example.cpython-37m-darwin.so [100%] Built target example

1.3 执行python测试

python ../test.py

输出：

(py36_pytorch041) ➜ build git:(master) ✗ python ../test.py Traceback (most recent call last): File "../test.py", line 2, in <module> import example ModuleNotFoundError: No module named 'example'

2 解决方法

2. 1 在cmake 时设定python的路径。

cmake -DPYTHON_LIBRARY=/Users/zhangxin/anaconda3/envs/py36_pytorch041/lib/libpython3.6m.dylib \ -DPYTHON_INCLUDE_DIR=/Users/zhangxin/anaconda3/envs/py36_pytorch041/include/python3.6 \ -DPYTHON_EXECUTABLE=/Users/zhangxin/anaconda3/envs/py36_pytorch041/bin/python3.6 \ ..

输出：

(py36_pytorch041) ➜ build git:(master) ✗ cmake -DPYTHON_LIBRARY=/Users/zhangxin/anaconda3/envs/py36_pytorch041/lib/libpython3.6m.dylib \ -DPYTHON_INCLUDE_DIR=/Users/zhangxin/anaconda3/envs/py36_pytorch041/include/python3.6 \ -DPYTHON_EXECUTABLE=/Users/zhangxin/anaconda3/envs/py36_pytorch041/bin/python3.6 \ .. -- The C compiler identification is AppleClang 10.0.1.10010046 -- The CXX compiler identification is AppleClang 10.0.1.10010046 -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/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: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Found PythonInterp: /Users/zhangxin/anaconda3/envs/py36_pytorch041/bin/python3.6 (found version "3.6.9") -- Found PythonLibs: /Users/zhangxin/anaconda3/envs/py36_pytorch041/lib/libpython3.6m.dylib -- Performing Test HAS_CPP14_FLAG -- Performing Test HAS_CPP14_FLAG - Success -- pybind11 v2.3.dev0 -- Performing Test HAS_FLTO -- Performing Test HAS_FLTO - Success -- LTO enabled -- Configuring done -- Generating done -- Build files have been written to: /Users/zhangxin/github/pybind11_examples/01_py-list_cpp-vector/build

2.2 make

(py36_pytorch041) ➜ build git:(master) ✗ make Scanning dependencies of target example [ 50%] Building CXX object CMakeFiles/example.dir/example.cpp.o [100%] Linking CXX shared module example.cpython-36m-darwin.so [100%] Built target example

2.3 测试

mv example.cpython-36m-darwin.so cd .. python test.py

3 代码

example.cpp

#include <pybind11/pybind11.h> #include <pybind11/stl.h> #include <vector> // ---------------- // Regular C++ code // ---------------- // multiply all entries by 2.0 // input: std::vector ([...]) (read only) // output: std::vector ([...]) (new copy) std::vector<double> modify(const std::vector<double>& input) { std::vector<double> output; std::transform( input.begin(), input.end(), std::back_inserter(output), [](double x) -> double { return 2.*x; } ); // N.B. this is equivalent to (but there are also other ways to do the same) // // std::vector<double> output(input.size()); // // for ( size_t i = 0 ; i < input.size() ; ++i ) // output[i] = 2. * input[i]; return output; } // ---------------- // Python interface // ---------------- namespace py = pybind11; PYBIND11_MODULE(example,m) { m.doc() = "pybind11 example plugin"; m.def("modify", &modify, "Multiply all entries of a list by 2.0"); }

test.py

import example A = [1.,2.,3.,4.] B = example.modify(A) print(B)

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.12) project(example) add_subdirectory(pybind11) pybind11_add_module(example example.cpp)