Doc: Describe Debug > Start Debugging > Load Last Core File

Task-number: QTCREATORBUG-31510
Change-Id: I6f974c32f0480f28abb97df1304c6a43ba86154e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: hjk <hjk@qt.io>

doc/qtcreator/src/debugger/creator-only/creator-debugger.qdoc

@@ -421,6 +421,8 @@
     generated from crashed processes on Linux and Unix systems if the system is
     set up to allow this.
 
+    \section1 Get core files
+
     To enable the dumping of core files on a Unix system, enter the following
     command in the shell from which the application is launched:
 
@@ -428,11 +430,13 @@
     ulimit -c unlimited
     \endcode
 
+    \section1 Attach to a core file
+
     To launch the debugger in the core mode:
 
     \list 1
-        \li Go to \uicontrol Debug > \uicontrol {Start Debugging} >
-            \uicontrol {Load Core File}.
+        \li Go to \uicontrol Debug > \uicontrol {Start Debugging}, and then
+            select \uicontrol {Load Core File}.
             \image qtcreator-debugger-load-core-file.png
         \li In \uicontrol Kit, select a build and run kit that was
             used for building the binary for which the core file was created.
@@ -452,8 +456,17 @@
             the \c sysroot to use instead of the default \c sysroot.
     \endlist
 
-    Even though using a properly configured project that has the sources of the
-    crashed application is not strictly necessary, it is helpful.
+    For better results, use a properly configured project that has the sources of
+    the crashed application.
+
+    \section1 Attach to the latest core file
+
+    On Linux systems, \QC uses the \c coredumpctl command provided by the
+    \c systemd crash handling to get core files. For more information, see
+    \l {systemd-coredump}.
+
+    To attach to the latest core file, go to \uicontrol Debug >
+    \uicontrol {Start Debugging}, and then select \uicontrol {Load Last Core File}.
 
     \sa {Debug}{How To: Debug}, {Debugging}, {Debuggers}, {Debugger}, {Kits}
 */

doc/qtcreator/src/external-resources/external-resources.qdoc

@@ -5,6 +5,10 @@
     \externalpage https://doc.qt.io/index.html
     \title Qt Documentation
 */
+/*!
+    \externalpage https://www.freedesktop.org/software/systemd/man/latest/systemd-coredump.html
+    \title systemd-coredump
+*/
 /*!
     \externalpage https://www.perforce.com/manuals/cmdref/Content/CmdRef/P4CONFIG.html
     \title Perforce: P4CONFIG