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  • scratch ae2924b mfwolffe committed
README.mdmodified
@@ -70,7 +70,7 @@ Pretty much everything:
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 ## Building
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 Requires:
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-- A Fortran 2018 compiler (gfortran 8+, or flang-new for macOS ARM64)
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+- A Fortran 2018 compiler (`armfortas`, `gfortran` 8+, or `flang-new`)
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 - GNU Make
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 - A C compiler (gcc or clang)
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 - POSIX system (Linux, macOS)
@@ -90,7 +90,7 @@ make clean # remove build/ and bin/
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 | Linux x86_64 | gfortran | Primary target |
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 | Linux aarch64 | gfortran | Auto-enables C stat helpers for struct layout differences |
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 | macOS Intel | gfortran | Works with `-frecursive` |
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-| macOS ARM64 | flang-new (LLVM) | Required -- gfortran has 7+ critical bugs. Auto-enables C string library. Install via `brew install flang`. |
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+| macOS ARM64 | flang-new by default, `armfortas` when selected explicitly | The Makefile has an armfortas profile; flang-new remains the safe default and auto-enables the C string library. |
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 The Makefile auto-detects your platform and selects the right compiler and flags. Just run `make`.
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@@ -583,12 +583,12 @@ Every builtin has detailed help: `help cd`, `help export`, `help trap`, etc.
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 ## macOS ARM64 Notes
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-Both Fortran compilers have issues on Apple Silicon. fortsh uses flang-new (LLVM) with C interop workarounds. The Makefile handles everything automatically.
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+Apple Silicon builds still default to flang-new (LLVM) with the existing C interop workarounds. The Makefile now also understands an explicit `FC=armfortas` path for pure-Fortran bring-up work.
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-Install flang-new via `brew install flang`. See `COMPILER_NOTES.md` for the full story on compiler bugs and workarounds.
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+Install flang-new via `brew install flang` for the default path. See `COMPILER_NOTES.md` for the full story on compiler bugs and workarounds.
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 Key differences from Linux builds:
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-- C string library auto-enabled (works around flang-new string buffer limitations)
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+- C string library auto-enabled only on the flang-new fallback path
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 - Platform-specific constants for signals, terminal I/O, file flags, and resource limits
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 - Builtin output uses C-level `write()` to respect fd redirections (flang-new's Fortran I/O caches file descriptors)
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@@ -646,3 +646,4 @@ POSIX Shell Spec: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_
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 ---
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 *Yes, it's really written in Fortran. Yes, it really works. No, we don't know why either.*
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+scratch