Merge pull request swiftlang#70601 from apple/dev/rokhinip-task-to-thread-preset

Add support for task-to-thread model as a build-preset

Author: rokhinip

stdlib/cmake/modules/StdlibOptions.cmake

@@ -200,7 +200,7 @@ set(SWIFT_STDLIB_REFLECTION_METADATA "enabled" CACHE STRING
 
 option(SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
        "Should concurrency use the task-to-thread model."
-       "${SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY_default}")
+       FALSE)
 
 option(SWIFT_STDLIB_HAS_STDIN
        "Build stdlib assuming the platform supports stdin and getline API."

utils/build-script-impl

@@ -218,6 +218,7 @@ KNOWN_SETTINGS=(
     swift-runtime-static-image-inspection         "0"               "whether to build stdlib assuming the runtime environment only supports a single runtime image with Swift code"
     swift-threading-package                       ""                "override the threading package for the host build; this is either a single package or a semicolon-separated list of sdk:package pairs.  Valid packages are empty string (no override), 'pthreads', 'darwin', 'linux', 'win32', 'c11', 'none'"
     swift-stdlib-single-threaded-concurrency      "0"               "build Swift concurrency in single-threaded mode"
+    swift-stdlib-task-to-thread-model-concurrency "0"               "build Swift concurrency with task-to-thread mode"
     swift-stdlib-tracing                          ""                "whether to enable tracing signposts for the stdlib; default is 1 on Darwin platforms, 0 otherwise"
     swift-stdlib-concurrency-tracing              ""                "whether to enable tracing signposts for concurrency; default is 1 on Darwin platforms, 0 otherwise"
     swift-stdlib-use-relative-protocol-witness-tables "0"            "whether to use relative protocol witness table"
@@ -1836,6 +1837,7 @@ for host in "${ALL_HOSTS[@]}"; do
                     -DSWIFT_IMPLICIT_CONCURRENCY_IMPORT:BOOL=$(true_false "${SWIFT_IMPLICIT_CONCURRENCY_IMPORT}")
                     -DSWIFT_STDLIB_SUPPORT_BACK_DEPLOYMENT:BOOL=$(true_false "${SWIFT_STDLIB_SUPPORT_BACK_DEPLOYMENT}")
                     -DSWIFT_STDLIB_SINGLE_THREADED_CONCURRENCY:BOOL=$(true_false "${SWIFT_STDLIB_SINGLE_THREADED_CONCURRENCY}")
+                    -DSWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY:BOOL=$(true_false "${SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY}")
                     -DSWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS:BOOL=$(true_false "${SWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS}")
                     -DSWIFT_STDLIB_HAS_DLADDR:BOOL=$(true_false "${SWIFT_STDLIB_HAS_DLADDR}")
                     -DSWIFT_STDLIB_HAS_DLSYM:BOOL=$(true_false "${SWIFT_STDLIB_HAS_DLSYM}")