Debugger: Support linux remote debugging with LLDB

Adds support for Linux remote debugging with lldb-server

Change-Id: I3ee08704a3116030111df75273a46a2e4888f98e
Reviewed-by: hjk <hjk@qt.io>

share/qtcreator/debugger/lldbbridge.py

@@ -972,30 +972,56 @@ class Dumper(DumperBase):
                     self.remoteChannel_, None, error)
             else:
                 if self.platform_ == "remote-macosx":
-                    DumperBase.warn("TARGET: %s" % self.target)
-
+                    self.report("Connecting to remote target: connect://%s" % self.remoteChannel_)
                     self.process = self.target.ConnectRemote(
                         self.debugger.GetListener(),
                         "connect://" + self.remoteChannel_, None, error)
 
+                    if not error.Success():
+                        self.report("Failed to connect to remote target: %s" % error.GetCString())
+                        self.reportState('enginerunfailed')
+                        return
+
                     if self.breakOnMain_:
                         self.createBreakpointAtMain()
 
-                    DumperBase.warn("PROCESS: %s" % self.process)
-                else:
+                    DumperBase.warn("PROCESS: %s (%s)" % (self.process, error.Success() and "Success" or error.GetCString()))
+                elif self.platform_ == "remote-linux":
+                    self.report("Connecting to remote target: connect://%s" % self.remoteChannel_)
+
+                    platform = self.target.GetPlatform()
+                    url = "connect://" + self.remoteChannel_
+                    conOptions = lldb.SBPlatformConnectOptions(url)
+                    error = platform.ConnectRemote(conOptions)
+
+                    if not error.Success():
+                        self.report("Failed to connect to remote target (%s): %s" % (url, error.GetCString()))
+                        self.reportState('enginerunfailed')
+                        return
+
                     f = lldb.SBFileSpec()
                     f.SetFilename(self.executable_)
-
                     launchInfo = lldb.SBLaunchInfo(self.processArgs_)
-                    #launchInfo.SetWorkingDirectory(self.workingDirectory_)
+                    launchInfo.SetWorkingDirectory(self.workingDirectory_)
                     launchInfo.SetWorkingDirectory('/tmp')
-                    if self.platform_ == 'remote-android':
-                        launchInfo.SetWorkingDirectory('/data/local/tmp')
                     launchInfo.SetEnvironmentEntries(self.environment_, False)
                     launchInfo.SetExecutableFile(f, True)
-                    DumperBase.warn("TARGET: %s" % self.target)
                     self.process = self.target.Launch(launchInfo, error)
-                    DumperBase.warn("PROCESS: %s" % self.process)
+
+                    if not error.Success():
+                        self.report("Failed to launch remote target: %s" % (error.GetCString()))
+                        self.reportState('enginerunfailed')
+                        return
+                    else:
+                        self.report("Process has launched.")
+
+                    if self.breakOnMain_:
+                        self.createBreakpointAtMain()
+
+                else:
+                    self.report("Unsupported platform: %s" % self.platform_)
+                    self.reportState('enginerunfailed')
+                    return
 
             if not error.Success():
                 self.report(self.describeError(error))

src/plugins/debugger/debuggerruncontrol.cpp

@@ -1068,7 +1068,26 @@ DebugServerRunner::DebugServerRunner(RunControl *runControl, DebugServerPortsGat
                             cmd.setExecutable(lldbserver);
                     }
                 } else {
-                    cmd.setExecutable(runControl->device()->filePath("gdbserver"));
+                    const FilePath gdbServerPath
+                        = runControl->device()->filePath("gdbserver").searchInPath();
+                    FilePath lldbServerPath
+                        = runControl->device()->filePath("lldb-server").searchInPath();
+
+                    // TODO: Which one should we prefer?
+                    if (gdbServerPath.isExecutableFile())
+                        cmd.setExecutable(gdbServerPath);
+                    else if (lldbServerPath.isExecutableFile()) {
+                        // lldb-server will fail if we start it through a link.
+                        // see: https://github.com/llvm/llvm-project/issues/61955
+                        //
+                        // So we first search for the real executable.
+
+                        // This is safe because we already checked that the file is executable.
+                        while (lldbServerPath.isSymLink())
+                            lldbServerPath = lldbServerPath.symLinkTarget();
+
+                        cmd.setExecutable(lldbServerPath);
+                    }
                 }
             }
             if (cmd.executable().baseName().contains("lldb-server")) {

src/plugins/debugger/lldb/lldbengine.cpp

@@ -295,7 +295,6 @@ void LldbEngine::handleLldbStarted()
         cmd2.arg("remotechannel", ((rp.startMode == AttachToRemoteProcess
                                    || rp.startMode == AttachToRemoteServer)
                                   ? rp.remoteChannel : QString()));
-        cmd2.arg("platform", rp.platform);
         QTC_CHECK(!rp.continueAfterAttach || (rp.startMode == AttachToRemoteProcess
                                               || rp.startMode == AttachToLocalProcess
                                               || rp.startMode == AttachToRemoteServer));