[Flang] Remove FLANG_INCLUDE_RUNTIME

flang/CMakeLists.txt

@@ -23,7 +23,6 @@ if (LLVM_ENABLE_EH)
 endif()
 
 set(FLANG_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
-set(FLANG_RT_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../flang-rt")
 
 if (CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE)
   message(FATAL_ERROR "In-source builds are not allowed. \
@@ -237,24 +236,8 @@ else()
   include_directories(SYSTEM ${MLIR_TABLEGEN_OUTPUT_DIR})
 endif()
 
-set(FLANG_INCLUDE_RUNTIME_default ON)
-if ("flang-rt" IN_LIST LLVM_ENABLE_RUNTIMES)
-  set(FLANG_INCLUDE_RUNTIME_default OFF)
-endif ()
-option(FLANG_INCLUDE_RUNTIME "Build the runtime in-tree (deprecated; to be replaced with LLVM_ENABLE_RUNTIMES=flang-rt)" FLANG_INCLUDE_RUNTIME_default)
-if (FLANG_INCLUDE_RUNTIME)
-  if ("flang-rt" IN_LIST LLVM_ENABLE_RUNTIMES)
-    message(WARNING "Building Flang-RT using LLVM_ENABLE_RUNTIMES. FLANG_INCLUDE_RUNTIME=${FLANG_INCLUDE_RUNTIME} ignored.")
-    set(FLANG_INCLUDE_RUNTIME OFF)
-  else ()
-     message(STATUS "Building flang_rt in-tree")
-  endif ()
-else ()
-  if ("flang-rt" IN_LIST LLVM_ENABLE_RUNTIMES)
-    message(STATUS "Building Flang-RT using LLVM_ENABLE_RUNTIMES.")
-  else ()
-    message(STATUS "Not building Flang-RT. For a usable Fortran toolchain, compile a standalone Flang-RT")
-  endif ()
+if (NOT "flang-rt" IN_LIST LLVM_ENABLE_RUNTIMES)
+  message(STATUS "Not building Flang-RT. For a usable Fortran toolchain, compile a standalone Flang-RT")
 endif ()
 
 set(FLANG_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
@@ -484,10 +467,6 @@ if (FLANG_CUF_RUNTIME)
   find_package(CUDAToolkit REQUIRED)
 endif()
 
-if (FLANG_INCLUDE_RUNTIME)
-  add_subdirectory(runtime)
-endif ()
-
 if (LLVM_INCLUDE_EXAMPLES)
   add_subdirectory(examples)
 endif()