feat: use pyproject.toml instead

.appveyor.yml

@@ -16,10 +16,10 @@ install:
 - ps: |
     if ($env:PLATFORM -eq "x64") { $env:PYTHON = "$env:PYTHON-x64" }
     $env:PATH = "C:\Python$env:PYTHON\;C:\Python$env:PYTHON\Scripts\;$env:PATH"
-    python -m pip install --disable-pip-version-check --upgrade --no-warn-script-location pip setuptools
+    python -m pip install --disable-pip-version-check --upgrade --no-warn-script-location pip build
 build_script:
 - ps: |
-    python setup.py sdist
+    python -m build -s
     cd dist
     python -m pip install --verbose python_example-0.0.1.tar.gz
     cd ..

.github/workflows/wheels.yml

@@ -12,8 +12,6 @@ on:
 
 env:
   CIBW_TEST_COMMAND: python {project}/tests/test.py
-  # This can be removed if pyproject.toml is used
-  CIBW_BEFORE_BUILD: pip install pybind11
 
 
 jobs:
@@ -25,10 +23,10 @@ jobs:
     - uses: actions/setup-python@v2
 
     - name: Install deps
-      run: python -m pip install "setuptools>=42" "setuptools_scm[toml]>=4.1.0" twine
+      run: python -m pip install twine build
 
     - name: Build SDist
-      run: python setup.py sdist
+      run: python -m build -s
 
     - name: Check metadata
       run: twine check dist/*

.travis.yml

@@ -24,6 +24,7 @@ before_install:
   if [ -n "$PYTHON" ]; then
     if [ "$TRAVIS_OS_NAME" = "osx" ]; then
       export PATH="/Users/travis/Library/Python/2.7/bin:$PATH"
+      export MACOSX_DEPLOYMENT_TARGET="10.13"
       if [ "${PYTHON:0:1}" = "3" ]; then
         brew update; brew install python3;
       fi
@@ -46,8 +47,7 @@ before_install:
 install:
 - |
   if [ -n "$PYTHON" ]; then
-    python setup.py sdist
-    python -m pip install --verbose dist/*.tar.gz
+    python -m pip install .
   elif [ -n "$CONDA" ]; then
     conda build conda.recipe --python $CONDA
     conda install --use-local python_example

pyproject.toml

@@ -0,0 +1,8 @@
+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel",
+    "pybind11>=2.6.0",
+]
+
+build-backend = "setuptools.build_meta"

setup.py

@@ -1,13 +1,8 @@
 from setuptools import setup
 
-# With setup_requires, this runs twice - once without setup_requires, and once
-# with. The build only happens the second time.
-try:
-    from pybind11.setup_helpers import Pybind11Extension, build_ext
-    from pybind11 import get_cmake_dir
-except ImportError:
-    from setuptools import Extension as Pybind11Extension
-    from setuptools.command.build_ext import build_ext
+# Available at setup time due to pyproject.toml
+from pybind11.setup_helpers import Pybind11Extension, build_ext
+from pybind11 import get_cmake_dir
 
 import sys
 
@@ -39,10 +34,6 @@
     description="A test project using pybind11",
     long_description="",
     ext_modules=ext_modules,
-    # Note: You have to add pybind11 to both setup and install requires to make
-    # it available during the build. Using PEP 518's pyproject.toml is better!
-    setup_requires=["pybind11==2.6.0"],
-    install_requires=["pybind11==2.6.0"],
     extras_require={"test": "pytest"},
     # Currently, build_ext only provides an optional "highest supported C++
     # level" feature, but in the future it may provide more features.