From Stephen Huemann:
ORCA/C 2.2.1 is a new release of the ORCA/C compiler for the Apple IIGS. Major changes since ORCA/C 2.1.0 include:
Added support for almost all language and library features required by the C17 standard
Improved lint checks and debugging features to help detect errors
New command-line options for pre-include files and C standard selection
Improvements to generated code
Auto-segmenting linker
Hundreds of bug fixes
And more
Changes since ORCA/C 2.2.0 include:
Additional bug fixes
Improvements to generated code for some operations
Small optimizations in some library functions
The ORCA/C manual has been updated to cover the new features in ORCA/C 2.2. A readme file and detailed release notes are also available.
This is an update package designed to be installed on top of an existing copy of ORCA/C 2.1 or later. Instructions on applying the update are available here. Note that the disk image must be treated as a hard drive image or high-density floppy image. If you need to use an 800KB floppy, place the SHK file on it instead of using the disk image.