[CMake] Fatal error when bootstrapping is not "hosttools"

and Swift parser integration is enabled.
If swift parser integration is enabled, SwiftSyntax libraries are always
built with host tools. Other SwiftCompilerSources modules must use the
same runtime with parser libraries.

(cherry picked from commit 0f0c492)

Author: rintaro

CMakeLists.txt

@@ -958,6 +958,10 @@ if(SWIFT_PATH_TO_EARLYSWIFTSYNTAX_BUILD_DIR)
   else()
     set(SWIFT_SWIFT_PARSER TRUE)
     include(${SWIFT_PATH_TO_EARLYSWIFTSYNTAX_TARGETS})
+
+    if(SWIFT_HOST_VARIANT_SDK STREQUAL "LINUX" AND NOT BOOTSTRAPPING_MODE STREQUAL "HOSTTOOLS")
+      message(FATAL_ERROR "Only BOOTSTRAPPING=HOSTTOOLS is supported in Linux when Swift parser integration is enabled")
+    endif()
   endif()
 endif()
 

tools/SourceKit/cmake/modules/AddSwiftSourceKit.cmake

@@ -132,10 +132,8 @@ function(add_sourcekit_swift_runtime_link_flags target path HAS_SWIFT_MODULES)
 
       file(RELATIVE_PATH relative_rtlib_path "${path}" "${SWIFTLIB_DIR}/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
       list(APPEND RPATH_LIST "$ORIGIN/${relative_rtlib_path}")
-
-      if(ASKD_BOOTSTRAPPING_MODE STREQUAL "HOSTTOOLS")
-        list(APPEND RPATH_LIST "${host_lib_dir}")
-      endif()
+      # NOTE: SourceKit components are NOT executed before stdlib is built.
+      # So there's no need to add RUNPATH to builder's runtime libraries.
 
     elseif(ASKD_BOOTSTRAPPING_MODE STREQUAL "BOOTSTRAPPING")
       get_bootstrapping_swift_lib_dir(bs_lib_dir "")