The common C shims include headers that already declare every Rust-exported
symbol. Remove duplicate declarations so strict C builds do not report
redundant declarations or macro-expanded aliases.
The shims remain intentionally declaration-only; Rust still owns the exported
implementation.
Test Plan:
- compile debug.c with -Wall -Wextra -Werror
- compile error_private.c with -Wall -Wextra -Werror
- compile zstd_common.c with -Wall -Wextra -Werror
Refs: rust/README.md
Introduce the Rust static library and move the shared byte, bitstream, CPU,
error, xxHash, debug, and public-common implementations into it. Thin C shims
preserve the existing header-driven C build while original tests link the Rust
archive.
This establishes the ABI-safe foundation for later codec and CLI ports;
entropy coding, runtime support, codecs, dictionaries, and the CLI remain C.
The top-down migration map documents that boundary and its validation path.
Test Plan:
- cargo fmt --check
- cargo test --all-targets
- cargo clippy --all-targets -- -D warnings
- cargo build --release
Refs: rust/README.md
this is a prototype definition error:
`_mm_storeu_si128()` should accept a `void*` pointer,
since it explicitly states that it accepts unaligned addresses
yet requiring a `__m128i*` tells otherwise, and requires the compiler the enforce this alignment.
seems like a prototype interface error:
input parameter should have been `const void*`,
since the documentation is explicit that input doesn't have to be aligned,
but `const __m256i*` makes the compiler enforce it.
technically equivalent to `size_t`,
but it's the proper type for underlying register representation.
This makes it possible to control register type, and therefore size, independently from `size_t`,
which can be useful on systems where `size_t` is 32-bit, while the architecture supports 64-bit registers.
this was previously no triggered in x86 32-bit mode,
due to a limitation in `bitstream.h`, that was fixed in #4248.
Now, `bmi2` will be automatically detected and triggered
at compilation time, if the corresponding instruction set is enabled,
even in 32-bit mode.
Also: updated library documentation, to feature STATIC_BMI2 build variable
ddidderr
Yann Collet