Debugger: Introduce a pty based channel to inferiors

This is experimental for now and requires QTC_USE_PTY=1
in the environment to be used.

Change-Id: I460ce7b9283467d481e903f731f4243b7e5ec094
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -34,6 +34,7 @@
 #include "coregdbadapter.h"
 #include "gdbplainengine.h"
 #include "termgdbadapter.h"
+#include "terminal.h"
 #include "remotegdbserveradapter.h"
 #include "gdboptionspage.h"
 
@@ -790,6 +791,9 @@ void GdbEngine::interruptInferior()
     QTC_ASSERT(state() == InferiorStopRequested,
         qDebug() << "INTERRUPT INFERIOR: " << state(); return);
 
+    if (terminal()->sendInterrupt())
+        return;
+
     if (usesExecInterrupt()) {
         postCommand("-exec-interrupt", Immediate);
     } else {
@@ -4354,6 +4358,9 @@ void GdbEngine::startGdb(const QStringList &args)
     const QByteArray dumperSourcePath =
         ICore::resourcePath().toLocal8Bit() + "/debugger/";
 
+    if (terminal()->isUsable())
+        postCommand("set inferior-tty " + terminal()->slaveDevice());
+
     const QFileInfo gdbBinaryFile(m_gdb);
     const QByteArray uninstalledData = gdbBinaryFile.absolutePath().toLocal8Bit()
             + "/data-directory/python";