[CMake] Centralize the logic to get host '-target' tripple

And pass the value to 'swift-syntax', so they gets correct deployment
target.

Author: rintaro

CMakeLists.txt

@@ -1160,6 +1160,7 @@ if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin" AND NOT CMAKE_CROSSCOMPILING)
   set(CMAKE_OSX_DEPLOYMENT_TARGET "")
 endif()
 
+swift_get_host_triple(SWIFT_HOST_TRIPLE)
 set(SWIFT_HOST_MODULE_TRIPLE "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${SWIFT_HOST_VARIANT_ARCH}_MODULE}")
 set(SWIFT_HOST_LIBRARIES_DEST_DIR "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/swift/host")
 if(SWIFT_BUILD_SWIFT_SYNTAX)

cmake/modules/AddPureSwift.cmake

@@ -46,20 +46,7 @@ function(_add_host_swift_compile_options name)
     $<$<COMPILE_LANGUAGE:Swift>:-runtime-compatibility-version>
     $<$<COMPILE_LANGUAGE:Swift>:none>)
 
-  # Set the appropriate target triple.
-  # FIXME: This should be set by CMake.
-  if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
-    set(DEPLOYMENT_VERSION "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_DEPLOYMENT_VERSION}")
-  endif()
-
-  if(SWIFT_HOST_VARIANT_SDK STREQUAL "ANDROID")
-    set(DEPLOYMENT_VERSION ${SWIFT_ANDROID_API_LEVEL})
-  endif()
-
-  get_target_triple(target target_variant "${SWIFT_HOST_VARIANT_SDK}" "${SWIFT_HOST_VARIANT_ARCH}"
-    MACCATALYST_BUILD_FLAVOR ""
-    DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")
-
+  swift_get_host_triple(target)
   target_compile_options(${name} PRIVATE $<$<COMPILE_LANGUAGE:Swift>:-target;${target}>)
   _add_host_variant_swift_sanitizer_flags(${name})
 endfunction()

cmake/modules/AddSwift.cmake

@@ -112,9 +112,7 @@ function(_add_host_variant_swift_sanitizer_flags target)
   endif()
 endfunction()
 
-# Usage:
-# _add_host_variant_c_compile_link_flags(name)
-function(_add_host_variant_c_compile_link_flags name)
+function(swift_get_host_triple out_var)
   if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
     set(DEPLOYMENT_VERSION "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_DEPLOYMENT_VERSION}")
   endif()
@@ -123,12 +121,21 @@ function(_add_host_variant_c_compile_link_flags name)
     set(DEPLOYMENT_VERSION ${SWIFT_ANDROID_API_LEVEL})
   endif()
 
+  get_target_triple(target target_variant "${SWIFT_HOST_VARIANT_SDK}" "${SWIFT_HOST_VARIANT_ARCH}"
+    MACCATALYST_BUILD_FLAVOR ""
+    DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")
+
+  set(${out_var} "${target}" PARENT_SCOPE)
+endfunction()
+
+# Usage:
+# _add_host_variant_c_compile_link_flags(name)
+function(_add_host_variant_c_compile_link_flags name)
+  swift_get_host_triple(target)
+
   # MSVC and gcc don't understand -target.
   # clang-cl understands --target.
   if(CMAKE_C_COMPILER_ID MATCHES "Clang")
-    get_target_triple(target target_variant "${SWIFT_HOST_VARIANT_SDK}" "${SWIFT_HOST_VARIANT_ARCH}"
-      MACCATALYST_BUILD_FLAVOR ""
-      DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")
     if("${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "MSVC") # clang-cl options
       target_compile_options(${name} PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--target=${target}>)
       target_link_options(${name} PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--target=${target}>)
@@ -139,9 +146,6 @@ function(_add_host_variant_c_compile_link_flags name)
   endif()
 
   if (CMAKE_Swift_COMPILER)
-    get_target_triple(target target_variant "${SWIFT_HOST_VARIANT_SDK}" "${SWIFT_HOST_VARIANT_ARCH}"
-      MACCATALYST_BUILD_FLAVOR ""
-      DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")
     target_compile_options(${name} PRIVATE $<$<COMPILE_LANGUAGE:Swift>:-target;${target}>)
 
    _add_host_variant_swift_sanitizer_flags(${name})

test/CMakeLists.txt

@@ -211,15 +211,7 @@ normalize_boolean_spelling(SWIFT_ENABLE_BACKTRACING)
 is_build_type_optimized("${SWIFT_STDLIB_BUILD_TYPE}" SWIFT_OPTIMIZED)
 
 # Get 'SWIFT_HOST_TRIPLE' and 'SWIFT_HOST_SDKROOT' for lit.site.cfg.in
-if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
-  set(DEPLOYMENT_VERSION "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_DEPLOYMENT_VERSION}")
-endif()
-if(SWIFT_HOST_VARIANT_SDK STREQUAL "ANDROID")
-  set(DEPLOYMENT_VERSION ${SWIFT_ANDROID_API_LEVEL})
-endif()
-get_target_triple(SWIFT_HOST_TRIPLE SWIFT_HOST_TRIPLE_VARIANT "${SWIFT_HOST_VARIANT_SDK}" "${SWIFT_HOST_VARIANT_ARCH}"
-  MACCATALYST_BUILD_FLAVOR ""
-  DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")
+swift_get_host_triple(SWIFT_HOST_TRIPLE)
 set(SWIFT_HOST_SDKROOT "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${SWIFT_HOST_VARIANT_ARCH}_PATH}")
 
 set(profdata_merge_worker