Fix cython_args build option handling

mesonbuild/backend/ninjabackend.py

@@ -1898,6 +1898,10 @@ def generate_cython_transpile(self, target: build.BuildTarget) -> \
         args += cython.get_option_std_args(target, target.subproject)
         args += self.build.get_global_args(cython, target.for_machine)
         args += self.build.get_project_args(cython, target)
+        cython_args = self.environment.coredata.optstore.get_value_for(
+            OptionKey('cython_args', target.subproject, target.for_machine))
+        assert isinstance(cython_args, list), 'for mypy'
+        args += cython_args
         args += target.get_extra_args('cython')
 
         ext = self.get_target_option(target, OptionKey('cython_language', machine=target.for_machine))

test cases/cython/3 cython_args/builtincythonargs.pyx

@@ -0,0 +1,5 @@
+def test():
+    IF BUILTIN_VALUE:
+        return 1
+    ELSE:
+        return 0

test cases/cython/3 cython_args/meson.build

@@ -24,6 +24,11 @@ mod = python.extension_module(
   ],
 )
 
+builtin_mod = python.extension_module(
+  'builtincythonargs',
+  files('builtincythonargs.pyx'),
+)
+
 test(
   'test',
   python,

test cases/cython/3 cython_args/test.json

@@ -0,0 +1,9 @@
+{
+  "matrix": {
+    "options": {
+      "cython_args": [
+        { "val": "--compile-time-env BUILTIN_VALUE=1" }
+      ]
+    }
+  }
+}

test cases/cython/3 cython_args/test.py

@@ -1,3 +1,5 @@
 import cythonargs
+import builtincythonargs
 
 assert cythonargs.test() == 1
+assert builtincythonargs.test() == 1