ada-mode: Overview
1 Overview
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The Emacs mode for programming in Ada helps the user in understanding
existing code and facilitates writing new code.
When the Gnu Ada compiler GNAT is used, the cross-reference
information output by the compiler is used to provide powerful code
navigation (jump to definition, find all uses, etc.).
When you open a file with a file extension of ‘.ads’ or ‘.adb’, Emacs
will automatically load and activate Ada mode.
Ada mode works without any customization, if you are using the GNAT
compiler (<https://libre2.adacore.com/>) and the GNAT default naming
convention.
You must customize a few things if you are using a different compiler
DONTPRINTYET or file naming convention; 
Other compiler, *NoteNon-standard
DONTPRINTYET or file naming convention; Other compiler, Non-standard
file names.
In addition, you may want to customize the indentation,
capitalization, and other things; Other customization.
Finally, for large Ada projects, you will want to set up an Emacs Ada
mode project file for each project; Project files. Note that
these are different from the GNAT project files used by gnatmake and
other GNAT commands.
See the Emacs info manual, section ’Running Debuggers Under Emacs’,
for general information on debugging.
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