GNUstep Objective-C Runtime

The GNUstep Objective-C runtime is designed as a drop-in replacement for the
GCC runtime. It supports both a legacy and a modern ABI, allowing code
compiled with old versions of GCC to be supported without requiring
recompilation. The modern ABI adds the following features:

• Non-fragile instance variables.
• Protocol uniquing.
• Object planes support.
• Declared property introspection.

Both ABIs support the following feature above and beyond the GCC runtime:

• The modern Objective-C runtime APIs, introduced with OS X 10.5.
• Blocks (closures).
• Low memory profile for platforms where memory usage is more important than speed.
• Synthesised property accessors.
• Efficient support for @synchronized()
• Type-dependent dispatch, eliminating stack corruption from mismatched selectors.

LICENSE: MIT