Use FetchContent to download pybind11

.github/workflows/build.yml

@@ -17,18 +17,14 @@ jobs:
         fetch-depth: 0
         # we need fetch-depth 0 so setuptools_scm can resolve tags
 
-    - name: Checkout submodules
-      uses: snickerbockers/submodules-init@v4
-
     - uses: actions/setup-python@v1
       name: Install Python
       with:
         python-version: '3.7'
 
-    - name: Install cibuildwheel and pybind11
+    - name: Install cibuildwheel
       run: |
         python -m pip install --upgrade pip
-        pip install wheel pybind11==2.5.0
         pip install cibuildwheel==1.3.0
 
     - name: Lint source with flake8
@@ -63,11 +59,9 @@ jobs:
           && rm -f /usr/bin/cmake
           && yum -y install boost-devel gmp-devel
           && python -m pip install --upgrade pip
-          && pip install pybind11==2.5.0
         CIBW_BEFORE_BUILD_MACOS: >
           brew install boost
           && python -m pip install --upgrade pip
-          && pip install pybind11==2.5.0
         CIBW_ENVIRONMENT_MACOS: MACOSX_DEPLOYMENT_TARGET=10.14
         CIBW_BUILD_VERBOSITY_MACOS: 0
         CIBW_TEST_REQUIRES: pytest
@@ -79,7 +73,6 @@ jobs:
           && cp {wheel} {dest_dir}
         CIBW_BEFORE_BUILD_WINDOWS: >
           python -m pip install --upgrade pip
-          && pip install pybind11==2.5.0
           && git clone https://github.com/Chia-Network/mpir_gc_x64.git
         CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: >
           ls -l mpir_gc_x64 && pip uninstall -y delocate

.gitignore

@@ -11,6 +11,7 @@ CMakeFiles/
 Makefile
 CMakeCache.txt
 cmake_install.cmake
+_deps/
 
 # Binary files
 src/compile_asm

README.md

@@ -20,9 +20,10 @@ pip wheel .
 
 The primary build process for this repository is to use GitHub Actions to
 build binary wheels for MacOS, Linux, and Windows and publish them with
-a source wheel on PyPi. See `.github/workflows/build.yml`. setup.py adds
-a dependency on [pybind11](https://github.com/pybind/pybind11) using
-`pip install pybind11`. Building is then managed by
+a source wheel on PyPi. See `.github/workflows/build.yml`. CMake uses
+[FetchContent](https://cmake.org/cmake/help/latest/module/FetchContent.html)
+to download [pybind11](https://github.com/pybind/pybind11).
+Building is then managed by
 [cibuildwheel](https://github.com/joerick/cibuildwheel). Further installation
 is then available via `pip install chiavdf` e.g.
 

src/CMakeLists.txt

@@ -26,8 +26,16 @@ include_directories(
 
 set (CMAKE_CXX_FLAGS "-std=c++1z")
 
-add_subdirectory(lib/pybind11)
-pybind11_add_module(chiavdf 
+include(FetchContent)
+
+FetchContent_Declare(
+  pybind11-src
+  GIT_REPOSITORY https://github.com/pybind/pybind11.git
+  GIT_TAG        v2.5.0
+)
+FetchContent_MakeAvailable(pybind11-src)
+
+pybind11_add_module(chiavdf
   ${CMAKE_CURRENT_SOURCE_DIR}/python_bindings/fastvdf.cpp
   ${CMAKE_CURRENT_SOURCE_DIR}/refcode/lzcnt.c
 )