Using GNU Modula-2

• Example compile and link
• Compiler options
• GNU Modula-2 related environment variables
• Elementary data types
• Permanently accessible base procedures.
  • Standard procedures and functions common to PIM and ISO
  • ISO specific standard procedures and functions
• GNU Modula-2 supported dialects
  • Integer division, remainder and modulus
• Exception implementation
• How to detect runtime problems at compile time
• GNU Modula-2 language extensions
  • Optional procedure parameter
• Type compatibility
  • Expression compatibility
  • Assignment compatibility
  • Parameter compatibility
• Unbounded by reference
• Building a shared library
• How to produce swig interface files
  • Limitations of automatic generated of Swig files
• How to produce a Python module
• Interfacing GNU Modula-2 to C
• Interface to assembly language
• Data type alignment
• Packing data types
• Accessing GNU Modula-2 Built-ins
• The PIM system module
• The ISO system module

This document contains the user and design issues relevant to the Modula-2 front end to gcc. Throughout this document the GNU Modula-2 front end is often referred to as gm2-1.9.5 or gm2 for short. This corresponds to GCC version 13.0.0 and GNU Modula-2 version 1.9.5.