termux-packages/packages/swift/swift-native-tools.patch

diff --git a/swift/CMakeLists.txt b/swift/CMakeLists.txt
index 8be6f4a7abd7..77e81153a232 100644
--- a/swift/CMakeLists.txt
+++ b/swift/CMakeLists.txt
@@ -481,10 +481,12 @@ if(SWIFT_PATH_TO_CMARK_BUILD)
 endif()
 message(STATUS "")
 
-if("${SWIFT_NATIVE_LLVM_TOOLS_PATH}" STREQUAL "")
-  set(SWIFT_CROSS_COMPILING FALSE)
+# Check if a prebuilt clang path was passed in, as this variable will be
+# assigned if not, in SwiftSharedCMakeConfig.
+if("${SWIFT_NATIVE_CLANG_TOOLS_PATH}" STREQUAL "")
+  set(SWIFT_PREBUILT_CLANG FALSE)
 else()
-  set(SWIFT_CROSS_COMPILING TRUE)
+  set(SWIFT_PREBUILT_CLANG TRUE)
 endif()
 
 include(SwiftSharedCMakeConfig)
diff --git a/swift/cmake/modules/SwiftSharedCMakeConfig.cmake b/swift/cmake/modules/SwiftSharedCMakeConfig.cmake
index c4c15084fe90..9ee086565891 100644
--- a/swift/cmake/modules/SwiftSharedCMakeConfig.cmake
+++ b/swift/cmake/modules/SwiftSharedCMakeConfig.cmake
@@ -58,7 +58,7 @@ macro(swift_common_standalone_build_config_llvm product)
     fix_imported_targets_for_xcode("${LLVM_EXPORTED_TARGETS}")
   endif()
 
-  if(NOT CMAKE_CROSSCOMPILING AND NOT SWIFT_CROSS_COMPILING)
+  if(NOT CMAKE_CROSSCOMPILING)
     set(${product}_NATIVE_LLVM_TOOLS_PATH "${LLVM_TOOLS_BINARY_DIR}")
   endif()
 
@@ -159,7 +159,7 @@ endmacro()
 macro(swift_common_standalone_build_config_clang product)
   find_package(Clang CONFIG REQUIRED NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
 
-  if (NOT CMAKE_CROSSCOMPILING)
+  if (NOT CMAKE_CROSSCOMPILING AND NOT SWIFT_PREBUILT_CLANG)
     set(${product}_NATIVE_CLANG_TOOLS_PATH "${LLVM_TOOLS_BINARY_DIR}")
   endif()
 
diff --git a/swift/stdlib/CMakeLists.txt b/swift/stdlib/CMakeLists.txt
index edf7c19f4b7a..91d9f4c28a51 100644
--- a/swift/stdlib/CMakeLists.txt
+++ b/swift/stdlib/CMakeLists.txt
@@ -112,11 +112,11 @@ else()
   # If we use Clang-cl or MSVC, CMake provides default compiler and linker flags that are incompatible
   # with the frontend of Clang or Clang++.
   if(SWIFT_COMPILER_IS_MSVC_LIKE)
-    set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang-cl")
-    set(CMAKE_C_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang-cl")
+    set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
+    set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
   else()
-    set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang++")
-    set(CMAKE_C_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang")
+    set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang++")
+    set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang")
   endif()
 
   if(CMAKE_C_COMPILER_LAUNCHER MATCHES ".*distcc")
diff --git a/swift/stdlib/cmake/modules/AddSwiftStdlib.cmake b/swift/stdlib/cmake/modules/AddSwiftStdlib.cmake
index 2a6e1d1df071..d5df9c57dd33 100644
--- a/swift/stdlib/cmake/modules/AddSwiftStdlib.cmake
+++ b/swift/stdlib/cmake/modules/AddSwiftStdlib.cmake
@@ -1669,7 +1669,8 @@ function(add_swift_target_library name)
     list(APPEND SWIFTLIB_SWIFT_COMPILE_FLAGS "-warn-implicit-overrides")
   endif()
 
-  if(NOT SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER AND NOT BUILD_STANDALONE)
+  if(NOT SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER AND NOT BUILD_STANDALONE AND
+     NOT SWIFT_PREBUILT_CLANG)
     list(APPEND SWIFTLIB_DEPENDS clang)
   endif()
 
diff --git a/swift/stdlib/public/SwiftShims/CMakeLists.txt b/swift/stdlib/public/SwiftShims/CMakeLists.txt
index 926020372fb2..5ee8a9c92069 100644
--- a/swift/stdlib/public/SwiftShims/CMakeLists.txt
+++ b/swift/stdlib/public/SwiftShims/CMakeLists.txt
@@ -111,7 +111,8 @@ endif()
 # First extract the "version" used for Clang's resource directory.
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
   "${LLVM_PACKAGE_VERSION}")
-if(NOT SWIFT_INCLUDE_TOOLS AND SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER)
+if(NOT SWIFT_INCLUDE_TOOLS AND
+   (SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER OR SWIFT_PREBUILT_CLANG))
   if(SWIFT_COMPILER_IS_MSVC_LIKE)
     execute_process(COMMAND ${CMAKE_C_COMPILER} /clang:-print-resource-dir
       OUTPUT_VARIABLE clang_headers_location
diff --git a/swift/unittests/runtime/CMakeLists.txt b/swift/unittests/runtime/CMakeLists.txt
index 60f9944e1e64..2ca86bf2b407 100644
--- a/swift/unittests/runtime/CMakeLists.txt
+++ b/swift/unittests/runtime/CMakeLists.txt
@@ -13,11 +13,11 @@ if(("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "${SWIFT_PRIMARY_VARIANT_SDK}") AND
     # If we use Clang-cl or MSVC, CMake provides default compiler and linker flags that are incompatible
     # with the frontend of Clang or Clang++.
     if(SWIFT_COMPILER_IS_MSVC_LIKE)
-      set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang-cl")
-      set(CMAKE_C_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang-cl")
+      set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
+      set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
     else()
-      set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang++")
-      set(CMAKE_C_COMPILER "${SWIFT_NATIVE_LLVM_TOOLS_PATH}/clang")
+      set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang++")
+      set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang")
     endif()
 
     if(CMAKE_C_COMPILER_LAUNCHER MATCHES ".*distcc")
diff --git a/swift/utils/build-presets.ini b/swift/utils/build-presets.ini
index 5330b5acba18..dcba1e6d7b74 100644
--- a/swift/utils/build-presets.ini
+++ b/swift/utils/build-presets.ini
@@ -2283,10 +2283,9 @@ skip-build-cmark
 skip-build-benchmarks
 skip-test-cmark
 
-# This triggers the stdlib standalone build: Don't build tools (the compiler),
-# assume we are working with the host compiler.
+# This triggers the stdlib standalone build: don't build the native tools from
+# scratch, ie the compiler.
 build-swift-tools=0
-build-runtime-with-host-compiler=1
 
 # Then set the paths to our native tools. If compiling against a toolchain,
 # these should all be the ./usr/bin directory.
diff --git a/swift/utils/build-script b/swift/utils/build-script
index ab9809b1351c..f544478b2a57 100755
--- a/swift/utils/build-script
+++ b/swift/utils/build-script
@@ -707,6 +707,18 @@ class BuildScriptInvocation(object):
             impl_args += [
                 "--host-libtool", toolchain.libtool,
             ]
+        if args.native_clang_tools_path is not None:
+            impl_args += [
+                "--native-clang-tools-path=%s" % args.native_clang_tools_path
+            ]
+        if args.native_llvm_tools_path is not None:
+            impl_args += [
+                "--native-llvm-tools-path=%s" % args.native_llvm_tools_path
+            ]
+        if args.native_swift_tools_path is not None:
+            impl_args += [
+                "--native-swift-tools-path=%s" % args.native_swift_tools_path
+            ]
 
         # If we have extra_swift_args, combine all of them together and then
         # add them as one command.
diff --git a/swift/utils/build-script-impl b/swift/utils/build-script-impl
index 268d23de155a..7ac53c1e5a91 100755
--- a/swift/utils/build-script-impl
+++ b/swift/utils/build-script-impl
@@ -1485,13 +1485,6 @@ for host in "${ALL_HOSTS[@]}"; do
         fi
     fi
 
-    if [[ "${NATIVE_CLANG_TOOLS_PATH}" ]] ; then
-        common_cmake_options_host+=(
-                -DCMAKE_C_COMPILER="${NATIVE_CLANG_TOOLS_PATH}/clang"
-                -DCMAKE_CXX_COMPILER="${NATIVE_CLANG_TOOLS_PATH}/clang++"
-            )
-    fi
-
     llvm_cmake_options=(
         "${llvm_cmake_options[@]}"
         -DCMAKE_INSTALL_PREFIX:PATH="$(get_host_install_prefix ${host})"
diff --git a/swift/utils/build_swift/build_swift/driver_arguments.py b/swift/utils/build_swift/build_swift/driver_arguments.py
index 28a3ec0e6ab2..aab24712b801 100644
--- a/swift/utils/build_swift/build_swift/driver_arguments.py
+++ b/swift/utils/build_swift/build_swift/driver_arguments.py
@@ -374,6 +374,15 @@ def create_argument_parser():
     option('--host-cxx', store_path(executable=True),
            help='the absolute path to CXX, the "clang++" compiler for the '
                 'host platform. Default is auto detected.')
+    option('--native-swift-tools-path', store_path,
+           help='the path to a directory that contains prebuilt Swift tools '
+                'that are executable on the host platform')
+    option('--native-clang-tools-path', store_path,
+           help='the path to a directory that contains prebuilt Clang tools '
+                'that are executable on the host platform')
+    option('--native-llvm-tools-path', store_path,
+           help='the path to a directory that contains prebuilt LLVM tools '
+                'that are executable on the host platform')
     option('--cmake-c-launcher', store_path(executable=True),
            default=os.environ.get('C_COMPILER_LAUNCHER', None),
            help='the absolute path to set CMAKE_C_COMPILER_LAUNCHER')
diff --git a/swift/utils/build_swift/tests/expected_options.py b/swift/utils/build_swift/tests/expected_options.py
index 8f13cca65b9c..9ecfc4714312 100644
--- a/swift/utils/build_swift/tests/expected_options.py
+++ b/swift/utils/build_swift/tests/expected_options.py
@@ -189,6 +189,9 @@
     'lto_type': None,
     'maccatalyst': False,
     'maccatalyst_ios_tests': False,
+    'native_clang_tools_path': None,
+    'native_llvm_tools_path': None,
+    'native_swift_tools_path': None,
     'dump_config': False,
     'show_sdks': False,
     'skip_build': False,
@@ -653,6 +656,9 @@ class BuildScriptImplOption(_BaseOption):
     PathOption('--install-symroot'),
     PathOption('--install-destdir'),
     EnableOption('--install-all'),
+    PathOption('--native-clang-tools-path'),
+    PathOption('--native-llvm-tools-path'),
+    PathOption('--native-swift-tools-path'),
     PathOption('--symbols-package'),
     PathOption('--cmake-c-launcher'),
     PathOption('--cmake-cxx-launcher'),
diff --git a/swift/utils/swift_build_support/swift_build_support/products/product.py b/swift/utils/swift_build_support/swift_build_support/products/product.py
index ba6f673bb6c9..075b934d10ac 100644
--- a/swift/utils/swift_build_support/swift_build_support/products/product.py
+++ b/swift/utils/swift_build_support/swift_build_support/products/product.py
@@ -167,8 +167,11 @@ def install_toolchain_path(self, host_target):
         """toolchain_path() -> string
 
         Returns the path to the toolchain that is being created as part of this
-        build.
+        build, or to a native prebuilt toolchain that was passed in.
         """
+        if self.args.native_swift_tools_path is not None:
+            return os.path.split(self.args.native_swift_tools_path)[0]
+
         install_destdir = self.args.install_destdir
         if self.args.cross_compile_hosts:
             build_root = os.path.dirname(self.build_dir)