CODEWITHSUNDEEP
c++cmakesetuptoolspybind11
J. Sánchez
J. Sánchez

Reputation: 33

No soucers given to target error when adding sources in pybind11 and C++

I am trying to make a library written in C++ work in python, using pybind11.

The compilation and building of the source files works without errors, but the resulting files throw this error when installing with pip.

 CMake Error at pybind11/tools/pybind11Tools.cmake:131 (add_library):
      Cannot find source file:

        ../project/variables.cpp

      Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
      .hpp .hxx .in .txx
    Call Stack (most recent call first):
      CMakeLists.txt:5 (pybind11_add_module)


    CMake Error at pybind11/tools/pybind11Tools.cmake:131 (add_library):
      No SOURCES given to target: project
    Call Stack (most recent call first):
      CMakeLists.txt:5 (pybind11_add_module)

I am following the cmake_example and I am sure that the file exists. In fact, if I delete the file the error occur when running

python setup.py sdist

The folder structure is like this:

C++ project root folder
|-- C++ Project source files
|-- pybind folder
|------pybind11 source folder
|----------pybind.cpp file
|------pybind11 CmakeLists.txt
|------pybind11 Manifest.in

This is the CMakeLists.txt used by pybind.

cmake_minimum_required(VERSION 2.8.12)
project(project)

add_subdirectory(pybind11)
pybind11_add_module(project
project/pybind.cpp
../project/variables.cpp
../project/instances.cpp
.
.
.
)

Both the C++ and the pybind source folders are included in the Manifest.in file. Furthermore, ther is no error refering to project/pybind.cpp file.

Also, this method of building the python module worked for me a couple months ago in the same project. I have tried downgradin setuptools, pybind11 and cmake but it does not work. I may be wrong, but I think the only chages I have made have been to add a couple C++ headers to the project and som functions in the pybind.cppfile.

Upvotes: 2

Views: 14488

Answers (1)

Matthieu Brucher
Matthieu Brucher

Reputation: 22023

You shouldn't use relative paths, because the location is given relative to some internal detail of CMake!

Use for instance:

${CMAKE_PROJECT_DIR}/project/variables.cpp

Or better, use the result of FILE, as it populates these properly.

Even project/bind.cpp should be relative, but you are lucky in the sense that CMake knows about that subfolder and figures it out. But don't do that, use FILE to select them properly (you can be relative there).

FILE(GLOB PYBIND_SRC
project/pybind.cpp
../project/variables.cpp
../project/instances.cpp
)

pybind11_add_module(project
${PYBIND_SRC}
)

Upvotes: 5

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