This is a branch of GCC 12-1 with experimental support for AArch64 (Arm64) on Darwin.

The branch is recommended for (and has been tested on) powerpc, i686, x86_64 and aarch64 Darwin from Darwin9 (Mac OSX 10.5) through Darwin21 (macOS 12) (for architectures relevant to each version). The branch has also been tested to build cross-compilers between x86_64 and aarch64 and on aarch64-linux-gnu without regressions.

The support for Aarch64 (Arm64) remains experimental but is adequate now for many programs (and self-bootstrap).

Please see README for general information on the GCC sources.

Please see the GCC 12.1 release documentation for the implementation status of core language features.

Please see gcc/config/aarch64/darwinpcs.md for a description of the macOS AArch64 (Arm64) ABI support.

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

The current release is GCC-12.2-darwin-r0. (August 2022)

This release includes:

• All upstream fixes since 12.1.
• Improves the build to omit runpaths from the runtime libraries.
• A fix for PR106435 which improves the handling of cross-TU global initializers for thread-local variables.
• Fixes for builds and testing (include Ada) on Darwin8 (MacOSX 10.4, Tiger).

GCC-12.1-darwin-r1. (June 2022)

This release:

• Fixes a critical bug in the Arm64 port (related to Issue #3, which is unfixed in Xcode toolchains in common use).
• Adds a new configure option --with-darwin-extra-rpath= which allows a distribution to prepend a run path to the list automatically added by the compiler. This is to allow for cases where the distribution refers to installed libraries using symlinks from outside the installation paths.
• Resolves a potential issue with library references where a minor GCC version is replaced by the next and the old version is deleted.
• Amends some of the system version processing to handle changes expected in macOS 13+.
• Improves interoperability with clang in mixed code projects.

Thanks to contributors and testers.

GCC-12.1-darwin-r0. (May 2022)

Test results : iains#1 (comment)

Thanks to:

• 'FX' (https://github.com/fxcoudert) for the main part of the __float128 support, many test fixes and help in testing this release more widely.
• Andrew Burgess (while at Embecosm) for the work on heap based trampolines.
• Maxim Blinov (Embecosm) for work on modifications to GCC's function lowering code to enable better support of the Darwin Arm64 ABI.

Iain Sandoe.