comp: Fix alignment of bitfields in some edge cases. In order to properly compute the size of the bitfield for overaligned fields, we need to know the offset in the struct, not just in the allocation unit. E.g., something like: char; // Byte 1 char: 8; // Byte 2 short: 16; // Bytes 3 and 4 Should align differently than: char: 8; // Byte 1 short: 16; // Bytes 3 and 4 If we can't find the start offset in the struct, we fall back to our previous behavior (this can happen with C++ templates for example). We remove some code related to `is_ms_struct`, which was effectively dead. If someone cares about it they can resurrect it. We also don't align per-bitfield unit, but in order to mostly preserve behavior, we keep inserting a field at the beginning of the struct rather than using repr(align). Otherwise we hit #2179 in cases where we did not use to. We might want to extend that approach to repr(align) stuff, in order to try to fix #2179 more often, but for now do the minimal change. Fixes #1377 Fixes #3105 Fixes #743 Fixes #981 Fixes #1314 Co-authored-by: qinghon <wushengshijie@outlook.com>
bindgenbindgen automatically generates Rust FFI bindings to C (and some C++) libraries.
For example, given the C header doggo.h:
typedef struct Doggo { int many; char wow; } Doggo; void eleven_out_of_ten_majestic_af(Doggo* pupper);
bindgen produces Rust FFI code allowing you to call into the doggo library's functions and use its types:
/* automatically generated by rust-bindgen 0.99.9 */ #[repr(C)] pub struct Doggo { pub many: ::std::os::raw::c_int, pub wow: ::std::os::raw::c_char, } extern "C" { pub fn eleven_out_of_ten_majestic_af(pupper: *mut Doggo); }
📚 Read the bindgen users guide here! 📚
The bindgen minimum supported Rust version is 1.70.0.
The bindgen-cli minimum supported Rust version is 1.70.0.
No MSRV bump policy has been established yet, so MSRV may increase in any release.
The MSRV is the minimum Rust version that can be used to compile each crate. However, bindgen and bindgen-cli can generate bindings that are compatible with Rust versions below the current MSRV.
Most of the time, the bindgen-cli crate will have a more recent MSRV than bindgen as crates such as clap require it.
API reference documentation is on docs.rs
In addition to the library API and executable command-line API, bindgen can be controlled through environment variables.
End-users should set these environment variables to modify bindgen's behavior without modifying the source code of direct consumers of bindgen.
BINDGEN_EXTRA_CLANG_ARGS: extra arguments to pass to clang--sysroot=/path/to/sysroot-I"/path/with spaces"BINDGEN_EXTRA_CLANG_ARGS_<TARGET>: similar to BINDGEN_EXTRA_CLANG_ARGS, but used to set per-target arguments to pass to clang. Useful to set system include directories in a target-specific way in cross-compilation environments with multiple targets. Has precedence over BINDGEN_EXTRA_CLANG_ARGS.Additionally, bindgen uses libclang to parse C and C++ header files. To modify how bindgen searches for libclang, see the clang-sys documentation. For more details on how bindgen uses libclang, see the bindgen users guide.
We don't follow a specific release calendar, but if you need a release please file an issue requesting that (ping @emilio for increased effectiveness).