GCC 12.1.0 buid on macOS 12 Monterey (M1)

Unlike previous GCC packages for macOS, this package installs at a fixed location /opt/gcc-12.0.1-aarch64

BSD-3-Clause License

Tools w22.0.0. included from AdaCore on GitHub : GPL with the Runtime Library Exception:

• AUnit
• GNATCOLL sub-modules :
  • gnatcoll-core
    • ZLIB is included,
    • OMP and LZMA are not (the GNATCOLL version for LZMA requires thread support in the system library, not available on macOS).
  • gnatcoll-bindings
  • gnatcoll-db (only the SQLite backend)
• Gprbuild
• Langkit
• Libadalang
• Libadalang tools
• XMLAda