CI: Add --sourcekit-lsp-verify-generated-files build-script option

To verify that autogenerated files in the source tree match the ones that
would be generated from source.

Author: kateinoigakukun

utils/build-presets.ini

@@ -2055,6 +2055,7 @@ sourcekit-lsp
 swiftformat
 install-swiftformat
 sourcekit-lsp-lint
+sourcekit-lsp-verify-generated-files
 
 [preset: buildbot_sourcekitlsp_linux,no_sanitize]
 mixin-preset=mixin_swiftpm_package_linux_platform

utils/build_swift/build_swift/driver_arguments.py

@@ -766,6 +766,10 @@ def create_argument_parser():
     option('--test-sourcekit-lsp-sanitize-all',
            toggle_true('test_sourcekitlsp_sanitize_all'),
            help='run sourcekit-lsp tests under all sanitizers')
+    option('--sourcekit-lsp-verify-generated-files',
+           toggle_true('sourcekitlsp_verify_generated_files'),
+           help='set to verify that the generated files in the source tree ' +
+                'match the ones that would be generated from current main')
     option('--sourcekit-lsp-lint',
            toggle_true('sourcekitlsp_lint'),
            help='verify that sourcekit-lsp Source code is formatted correctly')

utils/swift_build_support/swift_build_support/products/sourcekitlsp.py

@@ -48,6 +48,22 @@ def is_swiftpm_unified_build_product(cls):
     def should_build(self, host_target):
         return True
 
+    def _run_swift_syntax_dev_utils(self, host_target, command, arguments=[]):
+        sourcekit_lsp_dev_utils = os.path.join(self.source_dir, 'SourceKitLSPDevUtils')
+
+        run_cmd = [
+            os.path.join(self.install_toolchain_path(host_target), "bin", "swift"),
+            'run',
+            '--package-path', sourcekit_lsp_dev_utils,
+            'sourcekit-lsp-dev-utils',
+            command,
+        ] + arguments
+
+        env = dict(os.environ)
+        env["SWIFTCI_USE_LOCAL_DEPS"] = "1"
+
+        shell.call(run_cmd, env=env)
+
     def _for_each_host_target(self, base_target, body):
         body(base_target)
 
@@ -58,6 +74,10 @@ def _for_each_host_target(self, base_target, body):
                 body(target)
 
     def build(self, host_target):
+        if self.args.sourcekitlsp_verify_generated_files:
+            self._run_swift_syntax_dev_utils(
+                host_target, 'verify-config-schema')
+
         self._for_each_host_target(
             host_target,
             lambda target: self.run_build_script_helper('build', host_target, target)