This is a branch of GCC-12.4 supporting AArch64(Arm64) on Darwin.

The branch is suitable for powerpc, i686, x86_64 and aarch64 Darwin from Darwin9 (MacOSX 10.5) through Darwin23 (macOS 14 / Sonoma) on architectures relevant to each version.

Please see README for general information on the GCC sources

The GCC 12.4 upstream release has many bug-fixes and improvements, please see the general GCC release documentation for details.

The notable changes for Darwin/macOS are:

better support for the dyld-based linker in Xcode 15+.
better support for macOS 14.
back-ported editions of "official" implementations for relocatable compiler and handling of __has_feature/__has_extension.

Please see gcc/config/aarch64/darwinpcs.md for a description of the AArch64 ABI support.

The current release is GCC-12.4-darwin-r0. (June 2024)

This release:

Includes all 12.4 Upstream bug fixes.
I've included support for the availability attribute in this branch, as it is an important facility for compatibility with Apple SDKs.

Extras thanks to:

'FX' (https://github.com/fxcoudert) for the main part of the __float128 support, progressing upstream commits and test fixes.
All folks who have tested and reported issues.

Iain Sandoe, June 2024.

Please report issues for this branch to: https://github.com/iains/gcc-12-branch/issues