driver: refactor driver tool logics into a library. NFC

Author: nkcsgexi

include/swift/DriverTool/DriverTool.h

@@ -0,0 +1,27 @@
+//===--- DriverTool.h - Driver control ----------------------*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides a high-level API for interacting with the basic
+// driver operation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_DRIVERTOOL_H
+#define SWIFT_DRIVERTOOL_H
+
+#include "swift/Basic/LLVM.h"
+
+namespace swift {
+  int mainEntry(int argc_, const char **argv_);
+} // namespace swift
+
+#endif

lib/CMakeLists.txt

@@ -22,6 +22,7 @@ add_subdirectory(ClangImporter)
 add_subdirectory(Demangling)
 add_subdirectory(DependencyScan)
 add_subdirectory(Driver)
+add_subdirectory(DriverTool)
 add_subdirectory(Frontend)
 add_subdirectory(FrontendTool)
 add_subdirectory(Index)

lib/DriverTool/CMakeLists.txt

@@ -0,0 +1,30 @@
+set(driver_sources_and_options
+                driver.cpp
+                autolink_extract_main.cpp
+                modulewrap_main.cpp
+                swift_api_digester_main.cpp
+                swift_indent_main.cpp
+                swift_symbolgraph_extract_main.cpp
+                swift_api_extract_main.cpp)
+
+set(driver_common_libs
+                swiftAPIDigester
+                swiftDriver
+                swiftFrontendTool
+                swiftSymbolGraphGen
+                LLVMBitstreamReader
+                libswift)
+
+add_swift_host_library(swiftDriverTool STATIC
+  ${driver_sources_and_options}
+)
+target_link_libraries(swiftDriverTool
+                      PUBLIC
+                      ${driver_common_libs})
+
+# If building as part of clang, make sure the headers are installed.
+if(NOT SWIFT_BUILT_STANDALONE)
+  add_dependencies(swiftDriverTool clang-resource-headers)
+endif()
+
+set_swift_llvm_is_available(swiftDriverTool)