GPR User Guide

Version 27.0w

Date: Jun 05, 2026

Contents:

• Introduction
  • What is GPR?
  • Attributes
• Your First Project
  • A minimal project
  • Project declaration
  • Source directories
  • Languages
  • Object and executable directories
  • Main subprograms
  • Compiler switches
  • What GPRbuild does
  • Next steps
• Managing Sources
  • How source discovery works
  • Source directories
  • Explicit source lists
  • Excluding sources
  • Ada naming conventions
  • Multiple suffixes per language
• Building Executables
  • Entry points
  • Executable names
  • Compiler switches
  • Linker switches
  • Binder switches
  • Global build switches
  • Common GPRbuild options
  • Out-of-tree builds
• Scenarios
  • External variables
  • Typed variables
  • case statements
  • Multiple scenario variables
  • Sharing scenario variables
• Libraries
  • Declaring a library project
  • Library kinds
  • Stand-alone libraries
  • Controlling source visibility
  • Aggregate library projects
• Organizing Multi-Project Systems
  • Why multiple projects?
  • Importing a project with with
  • Limited with
  • The project tree
  • Typical layout
• Project Extension
  • Basic syntax
  • What is inherited
  • Overriding sources
  • Overriding attributes and packages
  • Abstract base projects
  • Import redirection
  • extends all
• Aggregate Projects
  • Basic syntax
  • Use cases
  • Restrictions
• Working with Tools
  • Tools that operate on project trees
  • Tools that generate project files
• Best Practices
  • Project layout
  • Scenario variables
  • Object and output directories
  • Multi-project hygiene
  • Performance
• GNU Free Documentation License