Merge pull request astropy#10825 from astrofrog/add-pyproject

Fix Azure sdist job

MANIFEST.in

@@ -7,7 +7,9 @@ include CITATION
 include astropy/CITATION
 
 include ah_bootstrap.py
+include setup.py
 include setup.cfg
+include pyproject.toml
 include astropy/tests/coveragerc
 recursive-include astropy *.pyx *.c *.h *.map *.templ
 

pyproject.toml

@@ -0,0 +1,18 @@
+# NOTE: the v4.0.x branch of astropy still uses astropy-helpers
+# but we include pyproject.toml here so that python -m build can
+# work out of the box. In setup.py, we manually ensure that
+# astropy_helpers can be imported as an additional build time
+# dependency.
+
+[build-system]
+requires = ["setuptools",
+            "wheel",
+            "cython==0.29.14",
+            "jinja2==2.10.3",
+            # NOTE: we can't use the oldest-supported-numpy package
+            # here because it conflicts with the setup_requires
+            # setting in setup.cfg which is present in the v4.0.x
+            # branch.
+            "numpy==1.16.*; python_version<='3.7'",
+            "numpy==1.17.*; python_version>='3.8'"]
+build-backend = 'setuptools.build_meta'

setup.py

@@ -9,6 +9,11 @@
 import os
 import builtins
 
+# Because we have a pyproject.toml file, the isolated build environment
+# doesn't allow the ah_bootstrap file to be imported unless the current
+# directory is added to the Python path
+import sys
+sys.path.append(os.path.abspath("."))
 import ah_bootstrap  # noqa
 
 from astropy_helpers.distutils_helpers import is_distutils_display_option