setup.py: make it fail if extensions aren't built

We need to see when extension is failed to build on CICD.
Let's introduce CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST that is False by
default.
When it is set, setup.py fails when building of any extension is failed.

Author: fruch

.github/workflows/build-push.yml

@@ -12,7 +12,7 @@ env:
  CIBW_TEST_COMMAND_WINDOWS: "pytest {project}/tests/unit  -k \"not (test_deserialize_date_range_year or test_datetype or test_libevreactor)\" "
  CIBW_BEFORE_TEST: "pip install -r {project}/test-requirements.txt"
  CIBW_BEFORE_BUILD_LINUX: "rm -rf ~/.pyxbld && rpm --import https://repo.almalinux.org/almalinux/RPM-GPG-KEY-AlmaLinux && yum install -y libffi-devel libev libev-devel openssl openssl-devel"
- CIBW_ENVIRONMENT: "CASS_DRIVER_BUILD_CONCURRENCY=2 CFLAGS='-g0 -O3'"
+ CIBW_ENVIRONMENT: "CASS_DRIVER_BUILD_CONCURRENCY=2 CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST=yes CFLAGS='-g0 -O3'"
  CIBW_SKIP: cp36* cp37* pp*i686 *musllinux*
  CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28
  CIBW_MANYLINUX_PYPY_X86_64_IMAGE: manylinux_2_28

setup.py

@@ -204,7 +204,7 @@ def __init__(self, ext):
 sys.argv = [a for a in sys.argv if a not in ("--no-murmur3", "--no-libev", "--no-cython", "--no-extensions")]
 
 build_concurrency = int(os.environ.get('CASS_DRIVER_BUILD_CONCURRENCY', '0'))
-
+CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST = bool(os.environ.get('CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST', 'no') == 'yes')
 
 class NoPatchExtension(Extension):
 
@@ -284,6 +284,9 @@ def run(self):
         except DistutilsPlatformError as exc:
             sys.stderr.write('%s\n' % str(exc))
             warnings.warn(self.error_message % "C extensions.")
+            if CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST:
+                raise
+
 
     def build_extensions(self):
         if build_concurrency > 1:
@@ -302,6 +305,8 @@ def build_extension(self, ext):
             sys.stderr.write('%s\n' % str(exc))
             name = "The %s extension" % (ext.name,)
             warnings.warn(self.error_message % (name,))
+            if CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST:
+                raise
 
     def _setup_extensions(self):
         # We defer extension setup until this command to leveraage 'setup_requires' pulling in Cython before we
@@ -326,6 +331,7 @@ def _setup_extensions(self):
                         for m in cython_candidates],
                     nthreads=build_concurrency,
                     compiler_directives={'language_level': 3},
+                    exclude_failures=not CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST,
                 ))
 
                 self.extensions.extend(cythonize(
@@ -335,7 +341,8 @@ def _setup_extensions(self):
                 ))
             except Exception:
                 sys.stderr.write("Failed to cythonize one or more modules. These will not be compiled as extensions (optional).\n")
-
+                if CASS_DRIVER_BUILD_EXTENSIONS_ARE_MUST:
+                    raise
 
 def pre_build_check():
     """