Migrate options from stdlib/CMakeLists.txt into dedicated file (#40640)

Focus on options that are not defined in `StandaloneOverlay.cmake` and
which defaults are not computed.

Addresses rdar://86723819

Author: edymtt

stdlib/CMakeLists.txt

@@ -88,12 +88,6 @@ endif()
 
 # TODO: migrate this section to StdlibOptions.cmake to reduce duplication
 
-set(SWIFT_STDLIB_EXTRA_SWIFT_COMPILE_FLAGS "" CACHE STRING
-    "Extra flags to pass when compiling swift stdlib files")
-
-set(SWIFT_STDLIB_EXTRA_C_COMPILE_FLAGS "" CACHE STRING
-    "Extra flags to pass when compiling C/C++ stdlib files")
-
 option(SWIFT_STDLIB_STABLE_ABI
        "Should stdlib be built with stable ABI (library evolution, resilience)."
        "${SWIFT_STDLIB_STABLE_ABI_default}")
@@ -102,77 +96,26 @@ option(SWIFT_ENABLE_MODULE_INTERFACES
        "Generate .swiftinterface files alongside .swiftmodule files"
        "${SWIFT_STDLIB_STABLE_ABI}")
 
-option(SWIFT_STDLIB_HAS_DLADDR
-       "Build stdlib assuming the runtime environment runtime environment provides dladdr API."
-       TRUE)
-
 option(SWIFT_STDLIB_SUPPORTS_BACKTRACE_REPORTING
        "Build stdlib assuming the runtime environment provides the backtrace(3) API."
        "${SWIFT_STDLIB_SUPPORTS_BACKTRACE_REPORTING_default}")
 
-option(SWIFT_RUNTIME_STATIC_IMAGE_INSPECTION
-       "Build stdlib assuming the runtime environment runtime environment only supports a single runtime image with Swift code."
-       FALSE)
-
-option(SWIFT_STDLIB_HAS_DARWIN_LIBMALLOC
-       "Build stdlib assuming the Darwin build of stdlib can use extended libmalloc APIs"
-       TRUE)
-
 option(SWIFT_STDLIB_HAS_ASL
        "Build stdlib assuming we can use the asl_log API."
        "${SWIFT_STDLIB_HAS_ASL_default}")
 
-option(SWIFT_STDLIB_HAS_STDIN
-       "Build stdlib assuming the platform supports stdin and getline API."
-       TRUE)
-
-option(SWIFT_STDLIB_HAS_ENVIRON
-       "Build stdlib assuming the platform supports environment variables."
-       TRUE)
-
 option(SWIFT_STDLIB_HAS_LOCALE
        "Build stdlib assuming the platform has locale support."
        "${SWIFT_STDLIB_HAS_LOCALE_default}")
 
-option(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME
-       "Build the standard libraries assuming that they will be used in an environment with only a single thread."
-       FALSE)
-
-option(SWIFT_STDLIB_OS_VERSIONING
-       "Build stdlib with availability based on OS versions (Darwin only)."
-       TRUE)
-
-option(SWIFT_STDLIB_PASSTHROUGH_METADATA_ALLOCATOR
-       "Build stdlib without a custom implementation of MetadataAllocator, relying on malloc+free instead."
-       FALSE)
-
-option(SWIFT_STDLIB_HAS_COMMANDLINE
-       "Build stdlib with the CommandLine enum and support for argv/argc."
-       TRUE)
-
 option(SWIFT_BUILD_TEST_SUPPORT_MODULES
        "Whether to build StdlibUnittest and other test support modules. Defaults to On when SWIFT_BUILD_SDK_OVERLAY is On, or when SWIFT_INCLUDE_TESTS is On."
        "${SWIFT_BUILD_TEST_SUPPORT_MODULES_default}")
 
-option(SWIFT_FREESTANDING_FLAVOR
-       "When building the FREESTANDING stdlib, which build style to use (options: apple, linux)")
-
 option(SWIFT_STDLIB_ENABLE_PRESPECIALIZATION
        "Should stdlib be built with generic metadata prespecialization enabled. Defaults to On on Darwin and on Linux."
        "${SWIFT_STDLIB_ENABLE_PRESPECIALIZATION_default}")
 
-option(SWIFT_STDLIB_EXPERIMENTAL_HERMETIC_SEAL_AT_LINK
-       "Should stdlib be built with -experimental-hermetic-seal-at-link"
-       FALSE)
-
-set(SWIFT_STDLIB_ENABLE_LTO OFF CACHE STRING "Build Swift stdlib with LTO. One
-    must specify the form of LTO by setting this to one of: 'full', 'thin'. This
-    option only affects the standard library and runtime, not tools.")
-
-option(SWIFT_ENABLE_REFLECTION
-  "Build stdlib with support for runtime reflection and mirrors."
-  TRUE)
-
 if(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME)
   set(SWIFT_CONCURRENCY_GLOBAL_EXECUTOR_default "singlethreaded")
 else()

stdlib/cmake/modules/StdlibOptions.cmake

@@ -15,3 +15,60 @@ option(SWIFT_STDLIB_HAS_TYPE_PRINTING
 option(SWIFT_STDLIB_BUILD_PRIVATE
        "Build private part of the Standard Library."
        TRUE)
+
+option(SWIFT_STDLIB_HAS_DLADDR
+       "Build stdlib assuming the runtime environment runtime environment provides dladdr API."
+       TRUE)
+
+option(SWIFT_RUNTIME_STATIC_IMAGE_INSPECTION
+       "Build stdlib assuming the runtime environment runtime environment only supports a single runtime image with Swift code."
+       FALSE)
+
+option(SWIFT_STDLIB_HAS_DARWIN_LIBMALLOC
+       "Build stdlib assuming the Darwin build of stdlib can use extended libmalloc APIs"
+       TRUE)
+
+set(SWIFT_STDLIB_EXTRA_SWIFT_COMPILE_FLAGS "" CACHE STRING
+    "Extra flags to pass when compiling swift stdlib files")
+
+set(SWIFT_STDLIB_EXTRA_C_COMPILE_FLAGS "" CACHE STRING
+    "Extra flags to pass when compiling C/C++ stdlib files")
+
+option(SWIFT_STDLIB_EXPERIMENTAL_HERMETIC_SEAL_AT_LINK
+       "Should stdlib be built with -experimental-hermetic-seal-at-link"
+       FALSE)
+
+option(SWIFT_STDLIB_PASSTHROUGH_METADATA_ALLOCATOR
+       "Build stdlib without a custom implementation of MetadataAllocator, relying on malloc+free instead."
+       FALSE)
+
+option(SWIFT_STDLIB_HAS_COMMANDLINE
+       "Build stdlib with the CommandLine enum and support for argv/argc."
+       TRUE)
+
+option(SWIFT_ENABLE_REFLECTION
+  "Build stdlib with support for runtime reflection and mirrors."
+  TRUE)
+
+option(SWIFT_STDLIB_HAS_STDIN
+       "Build stdlib assuming the platform supports stdin and getline API."
+       TRUE)
+
+option(SWIFT_STDLIB_HAS_ENVIRON
+       "Build stdlib assuming the platform supports environment variables."
+       TRUE)
+
+option(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME
+       "Build the standard libraries assuming that they will be used in an environment with only a single thread."
+       FALSE)
+
+option(SWIFT_STDLIB_OS_VERSIONING
+       "Build stdlib with availability based on OS versions (Darwin only)."
+       TRUE)
+
+option(SWIFT_FREESTANDING_FLAVOR
+       "When building the FREESTANDING stdlib, which build style to use (options: apple, linux)")
+
+set(SWIFT_STDLIB_ENABLE_LTO OFF CACHE STRING "Build Swift stdlib with LTO. One
+    must specify the form of LTO by setting this to one of: 'full', 'thin'. This
+    option only affects the standard library and runtime, not tools.")