Salut Lespotes has documented his workflow for using Golden Gate for cross-development on Windows:

I would like to share with you my experience of cross-development between PC and Apple IIGS using ORCA and Golden Gate. I encountered a few difficulties at the beginning, but with the invaluable help of Kelvin Sherlock (the author of Golden Gate, whom I would like to thank very much), I now have a solution that works very well. Compilation, linking, and deployment to a disk image are automated with a Python program. From this experience, I have produced a very detailed guide illustrated with simple, ready-to-use examples, which you can find here: https://github.com/bruno185/Apple-IIGS-cross-dev-with-ORCA-Golden-Gate

Golden Gate 2.1.0 is here!

• QuickASM is supported and included. See more below
• Fixed an issue where opus-extractor only worked with ORCA/C update disk images.
• type-less files in 13: (the library directory) are assumed to be library files, for use with linux environments where file types are not available.

Utilities

• Added an rexport command to generate resource forks for use with Cadius and CiderPress
• Added a tar command. tar, binary ii, shk (uncompressed only) and stuff-it (uncompressed only) are supported. If you actually want to extract shk files, yankit, nulib2, or cidrepress are better options; this is primarily for generating shk files.

GS/OS

• ExpandPath misinterpreted multiple separators (//) after a prefix.

ToolBox

• SANE: FPCSTR off-by-one indices fixed.

QuickAsm

QuickAsm (aka QAsm) is a merlin-16+ compatible assembler, linker, and IDE developed by Shawn Quick in the early 1990s. The source code was made available on GitHub a few years back and Golden Gate has, secretly, included QuickAsm support for a while now. Shawn has graciously agreed to allow me to distribute the binaries so they are now included as well.

iix qasm asm.file.S - assembles a merlin/qasm source file.

iix qlink link.file.S - executes a merlin/qasm linker script

iix qasml asm.file.S - runs the quicklinker (assemble and link a single file)

Support files are located in the QASystem directory.

See the QASM docs for more information.

I’ve also included updates macros (from https://github.com/roughana/supermacs) and toolbox equates.

Golden Gate 2.0.9 is here!

• Fixed an issue with the MacOS installer package disliking ARM.
• MacOS installer is now code-signed and notarized.
• Fixed an issue loading some very old OMF v1 files.

GS/OS

• Fixed an issue with the FastFileLoad \r\n conversion improperly collapsing \n\n or \r\r lines.

Golden Gate 2.0.8 is here!

• The 65816 emulator now accurately emulates undocumented emulation mode behavior of (dp,x) and plb. Not that it should matter.
• opus-extractor will automatically identify ORCA/C update disk images and behave appropriately (no warnings about missing files or fiddling with the command line to specify a directory).
• (Win32) There is now a separate installer for x64 windows. You may want to update your $PATH environment variable to remove the 32-bit version (Settings -> Advanced System Settings -> Environment Variables… -> System Variables -> Path.)

ToolBox

• Time Zone Tool: GetTimePrefs implemented.
• Time Zone Tool: Offset2TimeZoneString implemented.
• Time Zone Tool: TimeZoneString2Offset implemented.
• Time Zone Tool: Fixed some incorrect tool numbers (preventing StartUp/ShutDown/Status/Version calls from working).
• SANE: FX2DEC improvement.

GS/OS

• FastFileLoad converts \r\n to \r so ORCA/C, etc. line numbers will be correct (and \ line joining works correctly).

Patches

• The Rez/DeRez patches were not always being applied correctly, due to intermittent dangling memory references.

Utilities

• Added the md5 command. sha1 is of course, more secure, but md5 is 25% fewer characters to type.
• Added the hexdump command, which like like the usual hexdump command (but without custom format strings). However, it does feature a -r flag to dump the resource and a -7 flag to strip the high bit when displaying ASCII.

occ

• Added --std flag to select the C version. occ --std=help to list options. (Requires ORCA C 2.2.0)
• The -f flag (which was previously mapped to #pragma float) now selects individual code optimizations, ala gcc and clang. occ -fhelp to list options. #pragma float can still be enabled via --float or -ffpe-float
• The -W flag was added to specify individual warnings (errors, really) to enable, ala gcc and clang. occ -Whelp to list options.
• occ now passes in the +F flag to ORCA C, which, as of 2.2.0, displays the filename when printing a diagnostic error.
• The --verbose, -I includefile and -D define options are now supported with the rez compiler.

After 6 years of development, 7 betas, 1,153 commits¹, and hundreds of bug fixes, ORCA C 2.2.0 is now available.

Stephen Heumann gave an overview of the update in his A24EVR presentation.