Break python3.6 compatibility by removing redundant parameters from s…

…etup.py

Parsing these parameters from pyproject.toml requires setuptools>=61.0
which is only available for python>=3.7.

.github/build/linux/cpymad.sh

@@ -24,7 +24,9 @@ python setup.py sdist
 
 for PYBIN in /opt/python/cp3*/bin; do
     rm -f src/cpymad/libmadx.c
-    "${PYBIN}/pip" wheel dist/*.tar.gz --no-deps -w rawdist/
+    if "${PYBIN}/python" -c "import sys;exit(sys.version_info<(3,7))"; then
+        "${PYBIN}/pip" wheel dist/*.tar.gz --no-deps -w rawdist/
+    fi
 done
 
 # Bundle external shared libraries into the wheels

pyproject.toml

@@ -57,7 +57,7 @@ optional-dependencies.dev = [
 [build-system]
 build-backend = "setuptools.build_meta"
 requires = [
-    "setuptools[core]",
+    "setuptools[core] >= 61.0",
     "cython>=3.1.0a1 ; python_version >= '3.13'",   # Cython3.1 needed for free-threaded python
     "cython<3        ; python_version  < '3.8'",    # Cython3.1 dropped support for python<3.8
     "cython          ; python_version >= '3.8' and python_version < '3.13'", # no particular requirements

setup.py

@@ -90,14 +90,6 @@ def fix_distutils_sysconfig_mingw():
         sysconfig._config_vars['CC'] = 'gcc'
 
 
-def exec_file(path):
-    """Execute a python file and return the `globals` dictionary."""
-    namespace = {}
-    with open(path, 'rb') as f:
-        exec(f.read(), namespace, namespace)
-    return namespace
-
-
 def get_extension_args(madxdir, shared, static, **libs):
     """Get arguments for C-extension (include pathes, libraries, etc)."""
     # libquadmath isn't available on aarch64, see #101:
@@ -132,29 +124,12 @@ def get_extension_args(madxdir, shared, static, **libs):
 
 
 if __name__ == '__main__':
-    sys.path.append(os.path.dirname(__file__))
     fix_distutils_sysconfig_mingw()
     options, sys.argv[1:] = command_line_options().parse_known_args()
-    # NOTE: The "metadata" parameters for setup() may appear to be redundant
-    # but are curently required on setuptools<61.0 and hence for python3.6
-    # for which setuptools>=60 is not available. See branch `drop-py36` for
-    # removal.
-    metadata = exec_file('src/cpymad/__init__.py')
     setup(
-        name='cpymad',
-        version=metadata['__version__'],
-        description=metadata['__summary__'],
         ext_modules=cythonize([
             Extension('cpymad.libmadx',
                       sources=["src/cpymad/libmadx.pyx"],
                       **get_extension_args(**options.__dict__)),
         ]),
-        packages=['cpymad', 'cpymad.COPYING'],
-        package_dir={'': 'src'},
-        zip_safe=False,             # zip is bad for redistributing shared libs
-        include_package_data=True,  # include files matched by MANIFEST.in
-        install_requires=[
-            'numpy',
-            'minrpc>=0.0.8',
-        ],
     )