The list of toolchains and their values presented in the project editor
(see The Project Wizard) can be customized through XML. The GPS default
list is contained in toolchains.xml. You can add your own toolchain
by providing an xml description following the below described structure:
<toolchain_default>toolchain_name-default_name.
<toolchain name="name">Each of the above tags can have the following chilren
<gnat_driver><gnat_list><debugger><cpp_filt><compiler lang="lang">The toolchain_default values can either be overriden or nullified by just providing the same tab with an empty value in a toolchain definition.