# Intel® System Studio 2019 - Installation Guide and Release Notes for Windows* Host GNU* Project Debugger (GDB)

Published: 06/22/2018

Last Updated: 06/22/2018

## Introduction

This document provides a brief overview as well as usage information for the GNU* Project Debugger (GDB) based debug solutions shipped with Intel® System Studio 2019. It also provides pointers to where you can find additional product information, technical support, articles and whitepapers.

Please refer to the general Intel® System Studio 2019 release notes for an introduction to the entire suite.

## What's New

This section provides an overview of recent changes to GDB based debug solutions. For information on what is new in other components of Intel® System Studio 2019, please read the individual component release notes.

Initial Version (Intel® System Studio 2019)

• GDB 8.0.1 (application debugger) for Linux*/Android* target
• Improved support for Intel® Processor Trace and Intel(R) Memory Protection Extensions for GDB 8.0.1

## System Requirements

Please refer to the general Intel® System Studio 2019 release notes for a full list of system requirements. Only host/target systems specified there are supported.
Specific for GDB, the following features require either an Intel® Atom™ processor, or a 4th generation Intel® Core™ processor or later on the target system:

• Branch Trace Store (btrace)

The following features require a 5th generation Intel® Core™ processor or later on the target system:

• Intel® Processor Trace (Intel® PT)

## Documentation and Debugger Features

### Documentation

To view the documentation of GDB, Intel® System Studio 2019 has to be installed first. After installation, the documentations can be found relative to the installation directory <install‑dir> under the following locations:

<install-dir>\documentation_2019\en\debugger\gdb-ia\gdb.pdf

<install-dir>\documentation_2019\en\debugger\gdb-igfx\gdb.pdf

Further information on how to use the debug solutions can be found here:

<install-dir>\documentation_2019\en\debugger\system_studio_2019\gdb-ia\get_started.htm

### GDB Features

The version of GDB provided as part of Intel® System Studio 2019 is based on GDB version 8.0.1. Notably, it contains the following features added by Intel:

• Data Race Detection (pdbx):
• Pointer Checker:
Assist in finding pointer issues if compiled with Intel® C++ Compiler and having Pointer Checker feature enabled (see Intel® C++ Compiler documentation for more information)
• Intel® Processor Trace (Intel® PT) support:
Improved version of Branch Trace Store supporting Intel® TSX. For 5th generation Intel® Core™ Processors and later access it via command:
(gdb) record btrace pt
• Improved Intel® Cilk™ Plus support:
Serialized execution of Intel® Cilk™ Plus parallel applications can be turned on and off during a debug session using the following command:
(gdb) set cilk-serialization [on|off]

Those features are only provided for the command line version and are not supported via the Eclipse* IDE Integration.
The provided GDB documentation (gdb.pdf) contains more information in the following chapters:

• “Debugging Data Race Conditions”: pdbx feature
• “Recording Inferior’s Execution and Replaying It”: btrace feature and Intel® PT
• “Detecting Boundary Violations in Code”: Pointer Checker
• “Serializing the Execution of Parallel Applications”: Improved Intel® Cilk™ Plus Support

### Eclipse* IDE Features

• Function Call History:
Visualizes Branch Trace Store & Intel® Processor Trace data. Available via menu (in Debug perspective):
Window->Show View->Function Call History
In non-Debug perspective:
Window->Show View->Other…, Debug->Function Call History

## Installation Notes

During the installation process of Intel® System Studio 2019, GNU* GDB 8.0.1 will be installed by default (for Linux*/Android* target). Otherwise, make sure it appears in the component list as needed.

In case it is not, or you want to modify the default, select Customize and navigate through the menus to change components:

Continue via button Next and finish the installation.

Please note that the sources for GDB and Python are not required for normal operation.

The provided debug solution will be automatically integrated into an Eclipse* IDE of your choice. If you do not specify one (default: Install Eclipse* IDE…) it provides an own Eclipse* IDE. This takes place if you continue with the installation of Intel® System Studio 2019. Activate the item Integrate with my existing installation of Eclipse; and provide the path to the Eclipse* IDE installed in the dialog below. Leave the default when you want to use the shipped Eclipse* IDE or turn off integration via third item.

Please refer to section 0 for further information on how to get started.

## Known Issues

The following issues are known for the current release:

Unable to find dynamic linker breakpoint function
GDB might print the following warning:

warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code.

When remotely debugging applications the same binaries need to be available on the host running GDB. GDB needs to be instructed where to find those by using the command
set sysroot <path>.  <path> is the root directory on the host containing a copy of the target binaries.

Could not load shared library symbols
GDB might print the following warning:

warning: Could not load shared library symbols for 2 libraries, e.g. /lib64/libc.so.6.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?

When remotely debugging applications the same binaries need to be available on the host running GDB. GDB needs to be instructed where to find those by using the command
set sysroot <path>.  <path> is the root directory on the host containing a copy of the target binaries.

Warning about missing OS ABI “Cygwin”
The following warning is side effect of the host ABI being different to the target:

warning: A handler for the OS ABI "Cygwin" is not built into this configuration of GDB.  Attempting to continue with the default i386:x86-64 settings.

This warning is for the host only. It can be safely ignored because debugging is only enabled for supported target systems which exclude the host.

Error “ImportError: No module named site” when starting provided GDB
In case this error shows up when starting the provided GDB, please make sure that the environment variable PYTHONHOME points to the following location:

<install‑dir>\debugger_2019\python\<arch>\

The value of <arch> is ia32 or intel64, identifying the architecture of the host system.

The installer will add that variable to your system and you should not see this error with a correct installation. Hence, if you see the above error message, please verify that your installation is correct or install again.

CDT 8.0 is not supported for the debugger plug-in
The general Intel® System Studio 2019 release notes list support for CDT 8.0 and higher. However, the GDB-IA (DSF) debugger plug-in is only supported for CDT 8.1 and higher.

Manually installing provided Eclipse* IDE plug-ins requires a certain order
When manually installing Eclipse* IDE plug-ins that come with Intel® System Studio 2019 a certain order must be maintained. The plug-in of the debugger has a dependency on the one of the compiler. Hence, the plug-in of the compiler has to be installed prior to the one of the debugger. When removing the compiler (or it’s plug-in), the plug-in of the debugger has to be removed first.
We strongly recommend to use the Eclipse* IDE integration feature of the Intel® System Studio 2019 installer rather than manually installing the plug-ins.

Target connect requires tcp: hint

(gdb) target remote tcp:<target>:2000

Security extensions hinder gdbserver to start

Integrity Measurement Architecture (IMA), e.g. Wind River Linux 5:
Start of gdbserver fails with Permission denied. Log file /var/log/syslog reads:

<date>WR-IntelligentDevice kernel: [???] IMA_Measurement: ERROR: <path_to_gdbserver>/gdbserver failed appraisement

To use gdbserver turn off IMA when building the image via --without-layer=wr-srm.
IMA can also be deactivated without a rebuild by specifying ima_appraise=off with the kernel boot options.

PaX:
Start of gdbserver fails with gdbserver: Cannot call inferior functions, Linux kernel PaX protection forbids return to non-executable pages!

To use gdbserver specify pax_softmode=1 in the kernel boot options ("permit by default" mode). This requires that the gdbserver executable is attributed with the correct permissions. Use the paxctl tool to do so:

$paxctl –c <path_to_gdbserver>/gdbserver$ paxctl –perms <path_to_gdbserver>/gdbserver

Evaluation of expressions with side-effects
The debugger does not evaluate expressions that contain assignments which read memory locations before writing to them (e.g. x = x + 1). Please do not use such assignments when evaluating expressions.

Function Call History in Eclipse* IDE only shown for thread causing event
Displaying the Function Call History in Eclipse* IDE only works for the thread that caused an event (i.e. a stop). It is currently not possible to switch the Function Call History to another thread. This will be fixed in a future release.

Chrome OS* debugging
In general, the device needs to be booted into development mode.

Drives mounted with “noexec” flag prevent execution:
When debugging a native application on Chrome OS*, execution of gdbserver and or the native application under debug might be prevented if the volume was mounted with the “noexec” flag set.

To use gdbserver, either select a volume that has been mounted without the “noexec” flags or remount the desired volume with the correct settings. Please consult the “Developer Guide”[1] and the “Chromium on Chromium OS Debugging Tips”[2] sections of the Chrome OS* web site.

iptables settings might prevent connection to gdbserver:
The default iptables settings on the target device might prevent a successful connection from GDB to gdbserver, causing a time out when trying to connect.

To use gdbserver, please modify the iptables settings as described in the “Chromium on Chromium OS Debugging Tips”[2].

This product includes software developed at:

GDB – The GNU* Project Debugger

Copyright Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

This program is free software; you can redistribute it and/or modify it under the terms and conditions of the GNU General Public License, version 2, as published by the Free Software Foundation.

This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

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