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rust: prevent implicit libc calls with LLVM 23 - #6
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Rust 1.99 uses LLVM 23, which infers the default wchar_t width when the module omits wchar_size metadata. This allows LLVM to replace the ADT offset scan with a wcslen call that the bootloader does not provide. Mark the freestanding Rust crate with no_builtins to prevent these substitutions while preserving normal host tests. Signed-off-by: Cody Ho <codyho@stanford.edu>
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Rust 1.99 uses LLVM 23, which infers the default wchar_t width when the module omits wchar_size metadata. This allows LLVM to replace the ADT offset scan with a wcslen call that the bootloader does not provide. Mark the freestanding Rust crate with no_builtins to prevent these substitutions while preserving normal host tests. The file now carries GPL-2.0-only contributions, so its SPDX line becomes MIT AND GPL-2.0-only. Signed-off-by: Cody Ho <codyho@stanford.edu> (cherry picked from commit 08f691e951e6c3284f9b3bc0fb058e3c4dc06f6f) Link: GravityLinux/bootloader#6 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Rust 1.99 uses LLVM 23, which infers the default wchar_t width when the module omits wchar_size metadata. This allows LLVM to replace the ADT offset scan with a wcslen call that is not provided by libc on macOS.
Mark the freestanding Rust crate with no_builtins to prevent these substitutions.