GdbEngine: Don't call blocking waitForStarted()

Connect to started() signal instead and continue
setup in its handler. Handle failed to start case
inside done() signal handler.

Change-Id: Iaf184ed3e934b1bd5f8128a6aa9c72e9f27e0f56
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -169,6 +169,8 @@ GdbEngine::GdbEngine()
     connect(&s.useDynamicType, &BaseAspect::changed,
             this, &GdbEngine::reloadLocals);
 
+    connect(&m_gdbProc, &QtcProcess::started,
+            this, &GdbEngine::handleGdbStarted);
     connect(&m_gdbProc, &QtcProcess::done,
             this, &GdbEngine::handleGdbDone);
     connect(&m_gdbProc, &QtcProcess::readyReadStandardOutput,
@@ -3865,20 +3867,10 @@ void GdbEngine::setupEngine()
         m_gdbProc.setWorkingDirectory(rp.debugger.workingDirectory);
     m_gdbProc.setEnvironment(gdbEnv);
     m_gdbProc.start();
+}
 
-    if (!m_gdbProc.waitForStarted()) {
+void GdbEngine::handleGdbStarted()
-        handleGdbStartFailed();
+{
-        QString msg;
-        FilePath wd = m_gdbProc.workingDirectory();
-        if (!wd.isReadableDir())
-            msg = failedToStartMessage() + ' ' + tr("The working directory \"%1\" is not usable.")
-                .arg(wd.toUserOutput());
-        else
-            msg = RunWorker::userMessageForProcessError(QProcess::FailedToStart, rp.debugger.command.executable());
-        handleAdapterStartFailed(msg);
-        return;
-    }
-
     showMessage("GDB STARTED, INITIALIZING IT");
     runCommand({"show version", CB(handleShowVersion)});
     runCommand({"show debug-file-directory", CB(handleDebugInfoLocation)});
@@ -3938,6 +3930,7 @@ void GdbEngine::setupEngine()
 
     showStatusMessage(tr("Setting up inferior..."));
 
+    const DebuggerRunParameters &rp = runParameters();
     // Addint executable to modules list.
     Module module;
     module.startAddress = 0;
@@ -4079,6 +4072,21 @@ void GdbEngine::reloadDebuggingHelpers()
 
 void GdbEngine::handleGdbDone()
 {
+    if (m_gdbProc.result() == ProcessResult::StartFailed) {
+        handleGdbStartFailed();
+        QString msg;
+        const FilePath wd = m_gdbProc.workingDirectory();
+        if (!wd.isReadableDir()) {
+            msg = failedToStartMessage() + ' ' + tr("The working directory \"%1\" is not usable.")
+                .arg(wd.toUserOutput());
+        } else {
+            msg = RunWorker::userMessageForProcessError(QProcess::FailedToStart,
+                runParameters().debugger.command.executable());
+        }
+        handleAdapterStartFailed(msg);
+        return;
+    }
+
     const QProcess::ProcessError error = m_gdbProc.error();
     if (error != QProcess::UnknownError) {
         QString msg = RunWorker::userMessageForProcessError(error,

src/plugins/debugger/gdb/gdbengine.h

@@ -111,6 +111,7 @@ private: ////////// General Interface //////////
     // The engine is still running just fine, but it failed to acquire a debuggee.
     void notifyInferiorSetupFailedHelper(const QString &msg);
 
+    void handleGdbStarted();
     void handleGdbDone();
     void readGdbStandardOutput();
     void readGdbStandardError();