introduce get_rn_ios_target_sdk_version()

Summary:
feels like this should be shared across oss

Changelog: [Internal]

Reviewed By: fkgozali

Differential Revision: D32940936

fbshipit-source-id: 76fa8fdac5a768586f7f3e916af2c57685a70e12

BUCK

@@ -17,6 +17,7 @@ load(
     "RCT_IMAGE_URL_LOADER_SOCKET",
     "RCT_URL_REQUEST_HANDLER_SOCKET",
     "YOGA_CXX_TARGET",
+    "get_react_native_ios_target_sdk_version",
     "react_fabric_component_plugin_provider",
     "react_module_plugin_providers",
     "react_native_root_target",
@@ -496,7 +497,7 @@ rn_xplat_cxx_library2(
     ],
     contacts = ["oncall+react_native@xmail.facebook.com"],
     fbobjc_enable_exceptions = True,
-    fbobjc_target_sdk_version = "11.0",
+    fbobjc_target_sdk_version = get_react_native_ios_target_sdk_version(),
     frameworks = [
         "$SDKROOT/System/Library/Frameworks/Foundation.framework",
         "$SDKROOT/System/Library/Frameworks/QuartzCore.framework",

tools/build_defs/oss/rn_defs.bzl

@@ -68,6 +68,9 @@ JNI_TARGET = "//ReactAndroid/src/main/jni/first-party/jni-hack:jni-hack"
 
 KEYSTORE_TARGET = "//keystores:debug"
 
+# Minimum supported iOS version for RN
+REACT_NATIVE_TARGET_IOS_SDK = "11.0"
+
 def get_apple_inspector_flags():
     return []
 
@@ -79,6 +82,9 @@ def get_react_native_preprocessor_flags():
     # This is a replacement for NDEBUG since NDEBUG is always defined in Buck on all Android builds.
     return []
 
+def get_react_native_ios_target_sdk_version():
+    return REACT_NATIVE_TARGET_IOS_SDK
+
 # Building is not supported in OSS right now
 def rn_xplat_cxx_library(name, compiler_flags_enable_exceptions = False, compiler_flags_enable_rtti = False, **kwargs):
     visibility = kwargs.get("visibility", [])
@@ -210,7 +216,7 @@ def rn_android_prebuilt_aar(*args, **kwargs):
 def rn_apple_library(*args, **kwargs):
     kwargs.setdefault("link_whole", True)
     kwargs.setdefault("enable_exceptions", True)
-    kwargs.setdefault("target_sdk_version", "11.0")
+    kwargs.setdefault("target_sdk_version", get_react_native_ios_target_sdk_version())
 
     fb_apple_library(*args, **kwargs)