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# xds-gdb: wrapper on gdb for XDS
`xds-gdb` is a wrapper on gdb debugger for X(cross) Development System.
This tool allows you to debug an application built with an xds-server without
the need to install gdb or any cross tool.
Two debugging models are supported:
1. native debugging
1. XDS remote debugging requiring an XDS server and allowing cross debug your
application.
By default XDS remote debug is used and you need to define `XDS_NATIVE_GDB`
variable to use native gdb debug mode instead.
> **SEE ALSO**: [xds-server](https://github.com/iotbzh/xds-server), a web server
used to remotely cross build applications.
> **SEE ALSO**: [xds-exec](https://github.com/iotbzh/xds-exec),
wrappers on `exec` command that allows to cross build your application through `xds-server`.
## Configuration
`xds-gdb` configuration is defined by variables (see listed below).
These variables may be set using :
- environment variables (inherited),
- or a config file set with `XDS_CONFIG` environment variable, for example:
`XDS_CONFIG=/tmp/my_xds_gdb_config.env xds-gdb`
- or by setting variables within a gdb ini file (see details below),
- or a "user" config file located in following directory (first found is taken):
1. $(CURRENT_DIRECTORY)/.xds-gdb.env
1. $(CURRENT_DIRECTORY)/../xds-gdb.env
1. $(CURRENT_DIRECTORY)/target/xds-gdb.env
1. $(HOME)/.config/xds/xds-gdb.env
### Configuration Variables
`XDS_CONFIG` :
Config file defining `XDS_xxx` configuration variables. Variables of this file
will overwrite inherited environment variables. Variables definition may be
prefixed or not by "export" keyword.
Here is an example of config file
```bash
cat $HOME/myProject/xds-gdb.env
export XDS_SERVER_URL=http://xds-docker:8000
export XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject
export XDS_SDK_ID=poky-agl_aarch64_4.0.1
```
`XDS_LOGLEVEL`
Set logging level (supported levels: panic, fatal, error, warn, info, debug)
`XDS_LOGFILE`
Set logging file, default `/tmp/xds-gdb.log`.
`XDS_NATIVE_GDB`
Use native gdb mode instead of remote XDS server mode.
`XDS_PROJECT_ID` *(mandatory with XDS server mode)*
Project ID you want to build
`XDS_RPATH`
Relative path into project
`XDS_SDK_ID` *(mandatory with XDS server mode)*
Cross Sdk ID to use to build project
`XDS_SERVER_URL` *(mandatory with XDS server mode)*
Remote XDS server url
### Configuration variables set within gdb init command file
Above `XDS_xxx` variables may also be defined within gdb init command file
(see --command or -x option of genuine Gdb).
You must respect the following syntax: commented line including `:XDS-ENV:` tag
Example of gdb init file where we define project and sdk ID:
```bash
# :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject
# :XDS-ENV: XDS_SDK_ID=poky-agl_aarch64_4.0.1
```
## How to build xds-gdb from scratch
### Prerequisites
You must install and setup [Go](https://golang.org/doc/install) version 1.7 or
higher to compile this tool.
### Building
Clone this repo into your `$GOPATH/src/github.com/iotbzh` and use delivered Makefile:
```bash
export GOPATH=$(realpath ~/workspace_go)
mkdir -p $GOPATH/src/github.com/iotbzh
cd $GOPATH/src/github.com/iotbzh
git clone https://github.com/iotbzh/xds-gdb.git
cd xds-gdb
make
```
## Debug
Visual Studio Code launcher settings can be found into `.vscode/launch.json`.
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