STORM-422 FIXED Added command line option "-disablecrashlogger" to disable crash logger.

This is a patch originally written by Robin Cornelius.
I made it work with Google Breakpad.

doc/contributions.txt

@@ -573,6 +573,7 @@ Robin Cornelius
 	SNOW-585
 	SNOW-599
 	SNOW-747
+	STORM-422
 	VWR-2488
 	VWR-9557
 	VWR-11128

indra/llcommon/llapp.cpp

@@ -90,6 +90,10 @@ S32 LL_HEARTBEAT_SIGNAL = (SIGRTMAX >= 0) ? (SIGRTMAX-0) : SIGUSR2;
 // the static application instance
 LLApp* LLApp::sApplication = NULL;
 
+// Allows the generation of core files for post mortem under gdb
+// and disables crashlogger
+BOOL LLApp::sDisableCrashlogger = FALSE; 
+
 // Local flag for whether or not to do logging in signal handlers.
 //static
 BOOL LLApp::sLogInSignal = FALSE;
@@ -461,11 +465,30 @@ bool LLApp::isQuitting()
 	return (APP_STATUS_QUITTING == sStatus);
 }
 
+// static
 bool LLApp::isExiting()
 {
 	return isQuitting() || isError();
 }
 
+void LLApp::disableCrashlogger()
+{
+	// Disable Breakpad exception handler.
+	if (mExceptionHandler != 0)
+	{
+		delete mExceptionHandler;
+		mExceptionHandler = 0;
+	}
+
+	sDisableCrashlogger = TRUE;
+}
+
+// static
+bool LLApp::isCrashloggerDisabled()
+{
+	return (sDisableCrashlogger == TRUE); 
+}
+
 #if !LL_WINDOWS
 // static
 U32 LLApp::getSigChildCount()
@@ -799,6 +822,15 @@ void default_unix_signal_handler(int signum, siginfo_t *info, void *)
 			{
 				llwarns << "Signal handler - Flagging error status and waiting for shutdown" << llendl;
 			}
+									
+			if (LLApp::isCrashloggerDisabled())	// Don't gracefully handle any signal, crash and core for a gdb post mortem
+			{
+				clear_signals();
+				llwarns << "Fatal signal received, not handling the crash here, passing back to operating system" << llendl;
+				raise(signum);
+				return;
+			}		
+			
 			// Flag status to ERROR, so thread_error does its work.
 			LLApp::setError();
 			// Block in the signal handler until somebody says that we're done.

indra/llcommon/llapp.h

@@ -189,6 +189,11 @@ class LL_COMMON_API LLApp : public LLOptionInterface
 	//
 	virtual bool mainLoop() = 0; // Override for the application main loop.  Needs to at least gracefully notice the QUITTING state and exit.
 
+	//
+	// Crash logging
+	//
+	void disableCrashlogger();				// Let the OS handle the crashes
+	static bool isCrashloggerDisabled();	// Get the here above set value
 
 	//
 	// Application status
@@ -280,6 +285,7 @@ class LL_COMMON_API LLApp : public LLOptionInterface
 	static void setStatus(EAppStatus status);		// Use this to change the application status.
 	static EAppStatus sStatus; // Reflects current application status
 	static BOOL sErrorThreadRunning; // Set while the error thread is running
+	static BOOL sDisableCrashlogger; // Let the OS handle crashes for us.
 
 #if !LL_WINDOWS
 	static LLAtomicU32* sSigChildCount; // Number of SIGCHLDs received.

indra/newview/app_settings/cmd_line.xml

@@ -391,5 +391,13 @@
       <string>CrashOnStartup</string>
     </map>
 
+    <key>disablecrashlogger</key>
+    <map>
+      <key>desc</key>
+      <string>Disables the crash logger and lets the OS handle crashes</string>
+      <key>map-to</key>
+      <string>DisableCrashLogger</string>
+    </map>
+
   </map>
 </llsd>

indra/newview/llappviewer.cpp

@@ -2020,6 +2020,15 @@ bool LLAppViewer::initConfiguration()
 	// - apply command line settings 
 	clp.notify(); 
 
+	// Register the core crash option as soon as we can
+	// if we want gdb post-mortem on cores we need to be up and running
+	// ASAP or we might miss init issue etc.
+	if(clp.hasOption("disablecrashlogger"))
+	{
+		llwarns << "Crashes will be handled by system, stack trace logs and crash logger are both disabled" << llendl;
+		LLAppViewer::instance()->disableCrashlogger();
+	}
+
 	// Handle initialization from settings.
 	// Start up the debugging console before handling other options.
 	if (gSavedSettings.getBOOL("ShowConsoleWindow"))
@@ -2596,6 +2605,11 @@ void LLAppViewer::handleViewerCrash()
 		abort();
 	}
 
+	if (LLApp::isCrashloggerDisabled())
+	{
+		abort();
+	}
+
 	// Returns whether a dialog was shown.
 	// Only do the logic in here once
 	if (pApp->mReportedCrash)