Break crashpad_handler into lib and exe for Windows

handler/main.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 32 matching lines @@
 #include "util/mach/mach_extensions.h"
 #include "util/posix/close_stdio.h"
 #elif defined(OS_WIN)
 #include <windows.h>
 #include "handler/win/crash_report_exception_handler.h"
 #include "util/win/exception_handler_server.h"
 #include "util/win/handle.h"
 #endif  // OS_MACOSX
 
 namespace crashpad {
+
 namespace {
 
 void Usage(const base::FilePath& me) {
   fprintf(stderr,
 "Usage: %" PRFilePath " [OPTION]...\n"
 "Crashpad's exception handler server.\n"
 "\n"
 "      --annotation=KEY=VALUE  set a process annotation in each crash report\n"
 "      --database=PATH         store the crash report database at PATH\n"
 #if defined(OS_MACOSX)
 "      --handshake-fd=FD       establish communication with the client over FD\n"
 "      --mach-service=SERVICE  register SERVICE with the bootstrap server\n"
 "      --reset-own-crash-exception-port-to-system-default\n"
 "                              reset the server's exception handler to default\n"
 #elif defined(OS_WIN)
 "      --handshake-handle=HANDLE\n"
 "                              create a new pipe and send its name via HANDLE\n"
 "      --pipe-name=PIPE        communicate with the client over PIPE\n"
 #endif  // OS_MACOSX
 "      --url=URL               send crash reports to this Breakpad server URL,\n"
 "                              only if uploads are enabled for the database\n"
 "      --help                  display this help and exit\n"
 "      --version               output version information and exit\n",
           me.value().c_str());
   ToolSupport::UsageTail(me);
 }
 
+}  // namespace
+
 int HandlerMain(int argc, char* argv[]) {
   const base::FilePath argv0(
       ToolSupport::CommandLineArgumentToFilePathStringType(argv[0]));
   const base::FilePath me(argv0.BaseName());
 
   enum OptionFlags {
     // Long options without short equivalents.
     kOptionLastChar = 255,
     kOptionAnnotation,
     kOptionDatabase,
@@ skipping 226 matching lines @@
   CrashReportExceptionHandler exception_handler(
       database.get(), &upload_thread, &options.annotations);
 
   exception_handler_server.Run(&exception_handler);
 
   upload_thread.Stop();
 
   return EXIT_SUCCESS;
 }
 
-}  // namespace
 }  // namespace crashpad
-
-#if defined(OS_MACOSX)
-int main(int argc, char* argv[]) {
-  return crashpad::HandlerMain(argc, argv);
-}
-#elif defined(OS_WIN)
-int wmain(int argc, wchar_t* argv[]) {
-  return crashpad::ToolSupport::Wmain(argc, argv, crashpad::HandlerMain);
-}
-#endif  // OS_MACOSX