Add a flag to enable-new-runtime-build that enables the new runtime build

utils/build-presets.ini

@@ -669,7 +669,7 @@ skip-test-sourcekit-lsp
 skip-test-swiftpm
 skip-test-llbuild
 
-extra-cmake-options=-DSWIFT_ENABLE_NEW_RUNTIME_BUILD=YES
+enable-new-runtime-build
 
 [preset: buildbot_incremental,tools=RA,stdlib=RD,smoketest=macosx,flto]
 mixin-preset=buildbot_incremental,tools=RA,stdlib=RD,smoketest=macosx

utils/build_swift/build_swift/driver_arguments.py

@@ -703,6 +703,9 @@ def create_argument_parser():
     option('--swift-freestanding-is-darwin', toggle_true,
            help='True if the freestanding platform is a Darwin one.')
 
+    option('--enable-new-runtime-build', toggle_true,
+           help='True to enable the new runtime build.')
+
     # -------------------------------------------------------------------------
     in_group('Options to select projects')
 

utils/build_swift/tests/expected_options.py

@@ -336,6 +336,7 @@
     'llvm_install_components': defaults.llvm_install_components(),
     'clean_install_destdir': False,
     'use_linker': None,
+    'enable_new_runtime_build': False,
 }
 
 
@@ -893,4 +894,5 @@ class BuildScriptImplOption(_BaseOption):
 
     StrOption('--llvm-install-components'),
     ChoicesOption('--use-linker', dest='use_linker', choices=['gold', 'lld']),
+    EnableOption('--enable-new-runtime-build', dest='enable_new_runtime_build'),
 ]

utils/swift_build_support/swift_build_support/products/swift.py

@@ -101,6 +101,9 @@ def __init__(self, args, toolchain, source_dir, build_dir):
 
         self._handle_swift_debuginfo_non_lto_args()
 
+        self.cmake_options.extend(
+            self._enable_new_runtime_build)
+
     @classmethod
     def product_source_name(cls):
         """product_source_name() -> str
@@ -288,6 +291,11 @@ def _enable_stdlib_symbol_graphs(self):
         return [('SWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL',
                  self.args.build_stdlib_docs)]
 
+    @property
+    def _enable_new_runtime_build(self):
+        return [('SWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL',
+                 self.args.enable_new_runtime_build)]
+
     def _handle_swift_debuginfo_non_lto_args(self):
         if ('swift_debuginfo_non_lto_args' not in self.args
                 or self.args.swift_debuginfo_non_lto_args is None):

utils/swift_build_support/tests/products/test_swift.py

@@ -72,7 +72,8 @@ def setUp(self):
             swift_freestanding_is_darwin=False,
             build_swift_private_stdlib=True,
             swift_tools_ld64_lto_codegen_only_for_supporting_targets=False,
-            build_stdlib_docs=False)
+            build_stdlib_docs=False,
+            enable_new_runtime_build=False)
 
         # Setup shell
         shell.dry_run = True
@@ -122,7 +123,8 @@ def test_by_default_no_cmake_options(self):
             '-DSWIFT_SHOULD_BUILD_EMBEDDED_STDLIB_CROSS_COMPILING=FALSE',
             '-DSWIFT_TOOLS_LD64_LTO_CODEGEN_ONLY_FOR_SUPPORTING_TARGETS:BOOL=FALSE',
             '-USWIFT_DEBUGINFO_NON_LTO_ARGS',
-            '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE'
+            '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE',
+            '-DSWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL=FALSE',
         ]
         self.assertEqual(set(swift.cmake_options), set(expected))
 
@@ -157,7 +159,8 @@ def test_swift_runtime_tsan(self):
             '-DSWIFT_SHOULD_BUILD_EMBEDDED_STDLIB_CROSS_COMPILING=FALSE',
             '-DSWIFT_TOOLS_LD64_LTO_CODEGEN_ONLY_FOR_SUPPORTING_TARGETS:BOOL=FALSE',
             '-USWIFT_DEBUGINFO_NON_LTO_ARGS',
-            '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE'
+            '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE',
+            '-DSWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL=FALSE',
         ]
         self.assertEqual(set(swift.cmake_options), set(flags_set))