# Debug your first AGL application

Debug is based on gdb and you need to use `xds-gdb` as a wrapper on gdb to
cross-debug your application.

This tool allows you to debug an application built with XDS without the need to install gdb or any cross tools.

Two debugging models are supported:

1. native debugging
1. XDS remote debugging requiring an XDS agent/server setup and that allows you to cross debug your application.

By default XDS debug model is used and you need to define `XDS_NATIVE_GDB`
variable to use native gdb debug mode instead.

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Links to subchapters :

- [Configuration](./5-1_debug-first-app-config.html)
- [xds-gdb from command line](./5-2_debug-first-app-cmd.html)
- [xds-gdb within an IDE](./5-3_debug-first-app-ide.html)