对于glog中ShutdownGoogleLogging后不能再次InitGoogleLogging问题的解决办法

注：最近代码已修复此bug

https://code.google.com/p/google-glog/issues/detail?id=142
https://code.google.com/p/google-glog/source/browse/trunk/src/utilities.cc

问题原因非常简单，utilities.cc文件中的ShutdownGoogleLoggingUtilities未对全局静态变量g_program_invocation_short_name重置为NULL，下面是相关的源代码，一看便知，解决办法就是加上：g_program_invocation_short_name = NULL;一句，由于是静态的全局变量，不能在自己程序中执行这个操作，除非改成非static全局变量。

源码文件logging.cc

1803 void InitGoogleLogging(const char* argv0) {

1804   glog_internal_namespace_::InitGoogleLoggingUtilities(argv0);

1805 }

1806 

1807 void ShutdownGoogleLogging() {

1808   glog_internal_namespace_::ShutdownGoogleLoggingUtilities();

1809   LogDestination::DeleteLogDestinations();

1810   delete logging_directories_list;

1811   logging_directories_list = NULL;

1812 }

源码文件src/utilities.cc

57 static const char* g_program_invocation_short_name = NULL;

167 bool IsGoogleLoggingInitialized() {

168   return g_program_invocation_short_name != NULL;

169 }

316 void InitGoogleLoggingUtilities(const char* argv0) {

317   CHECK(!IsGoogleLoggingInitialized())

318       << "You called InitGoogleLogging() twice!";

319   const char* slash = strrchr(argv0, '/');

320 #ifdef OS_WINDOWS

321   if (!slash)  slash = strrchr(argv0, '\\');

322 #endif

323   g_program_invocation_short_name = slash ? slash + 1 : argv0;

324   g_main_thread_id = pthread_self();

325 

326 #ifdef HAVE_STACKTRACE

327   InstallFailureFunction(&DumpStackTraceAndExit);

328 #endif

329 }

330 

331 void ShutdownGoogleLoggingUtilities() {

332   CHECK(IsGoogleLoggingInitialized())

333       << "You called ShutdownGoogleLogging() without calling InitGoogleLogging() first!";

334 #ifdef HAVE_SYSLOG_H

335   closelog();

336 #endif

      g_program_invocation_short_name = NULL;

337 }