diff --git a/cmake/caches/Runtime-MacOSX-arm64.cmake b/cmake/caches/Runtime-MacOSX-arm64.cmake
new file mode 100644
index 0000000000000..437d3845e2c33
--- /dev/null
+++ b/cmake/caches/Runtime-MacOSX-arm64.cmake
@@ -0,0 +1,20 @@
+set(SWIFT_HOST_VARIANT_SDK OSX CACHE STRING "")
+set(SWIFT_HOST_VARIANT_ARCH arm64 CACHE STRING "")
+set(SWIFT_DARWIN_SUPPORTED_ARCHS arm64 CACHE STRING "")
+set(SWIFT_PRIMARY_VARIANT_ARCH arm64 CACHE STRING "")
+
+# NOTE(compnerd) disable the tools, we are trying to build just the standard
+# library.
+set(SWIFT_INCLUDE_TOOLS NO CACHE BOOL "")
+
+# NOTE(compnerd) cannot build tests since the tests require the toolchain
+set(SWIFT_INCLUDE_TESTS NO CACHE BOOL "")
+
+# NOTE(compnerd) cannot build docs since that requires perl
+set(SWIFT_INCLUDE_DOCS NO CACHE BOOL "")
+
+# NOTE(compnerd) these are part of the toolchain, not the runtime.
+set(SWIFT_BUILD_SOURCEKIT NO CACHE BOOL "")
+
+# NOTE(compnerd) build with the compiler specified, not a just built compiler.
+set(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER YES CACHE BOOL "")
diff --git a/cmake/caches/Runtime-MacOSX-x86_64.cmake b/cmake/caches/Runtime-MacOSX-x86_64.cmake
new file mode 100644
index 0000000000000..f239e59af98e6
--- /dev/null
+++ b/cmake/caches/Runtime-MacOSX-x86_64.cmake
@@ -0,0 +1,20 @@
+set(SWIFT_HOST_VARIANT_SDK OSX CACHE STRING "")
+set(SWIFT_HOST_VARIANT_ARCH x86_64 CACHE STRING "")
+set(SWIFT_DARWIN_SUPPORTED_ARCHS x86_64 CACHE STRING "")
+set(SWIFT_PRIMARY_VARIANT_ARCH x86_64 CACHE STRING "")
+
+# NOTE(compnerd) disable the tools, we are trying to build just the standard
+# library.
+set(SWIFT_INCLUDE_TOOLS NO CACHE BOOL "")
+
+# NOTE(compnerd) cannot build tests since the tests require the toolchain
+set(SWIFT_INCLUDE_TESTS NO CACHE BOOL "")
+
+# NOTE(compnerd) cannot build docs since that requires perl
+set(SWIFT_INCLUDE_DOCS NO CACHE BOOL "")
+
+# NOTE(compnerd) these are part of the toolchain, not the runtime.
+set(SWIFT_BUILD_SOURCEKIT NO CACHE BOOL "")
+
+# NOTE(compnerd) build with the compiler specified, not a just built compiler.
+set(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER YES CACHE BOOL "")