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Remove cfg hacks for old MSRV #3525

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Jan 8, 2024
Merged

Remove cfg hacks for old MSRV #3525

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1 change: 1 addition & 0 deletions Cargo.toml
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Expand Up @@ -14,6 +14,7 @@ exclude = ["/ci/*", "/.github/*", "/.cirrus.yml", "/triagebot.toml"]
description = """
Raw FFI bindings to platform libraries like libc.
"""
rust-version = "1.71.0"
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Maybe update to the 2021 edition too? The 2015 edition has quite different name resolution rules that are foreign for people having learned rust in 2018 or later as well as anyone who has forgotten the 2015 rules.

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Good point, we should migrate to it, yeah.

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But the problem is that ctest2 uses a quite old librustc_syntax fork and doesn't support newer syntax at all. We have to rewrite ctest2 first :(


[package.metadata.docs.rs]
features = ["const-extern-fn", "extra_traits"]
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16 changes: 2 additions & 14 deletions README.md
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Expand Up @@ -51,21 +51,9 @@ libc = "0.2"

## Rust version support

The minimum supported Rust toolchain version is currently **Rust 1.13.0**.
The minimum supported Rust toolchain version is currently **Rust 1.71.0**
(libc does not currently have any policy regarding changes to the minimum
supported Rust version; such policy is a work in progress.) APIs requiring
newer Rust features are only available on newer Rust toolchains:

| Feature | Version |
|----------------------|---------|
| `union` | 1.19.0 |
| `const mem::size_of` | 1.24.0 |
| `repr(align)` | 1.25.0 |
| `extra_traits` | 1.25.0 |
| `core::ffi::c_void` | 1.30.0 |
| `repr(packed(N))` | 1.33.0 |
| `cfg(target_vendor)` | 1.33.0 |
| `const-extern-fn` | 1.62.0 |
supported Rust version; such policy is a work in progress).

## Platform support

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72 changes: 1 addition & 71 deletions build.rs
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Expand Up @@ -14,22 +14,10 @@ const ALLOWED_CFGS: &'static [&'static str] = &[
"freebsd13",
"freebsd14",
"freebsd15",
"libc_align",
"libc_cfg_target_vendor",
"libc_const_extern_fn",
"libc_const_extern_fn_unstable",
"libc_const_size_of",
"libc_core_cvoid",
"libc_deny_warnings",
"libc_int128",
"libc_long_array",
"libc_non_exhaustive",
"libc_packedN",
"libc_priv_mod_use",
"libc_ptr_addr_of",
"libc_thread_local",
"libc_underscore_const_names",
"libc_union",
];

// Extra values to allow for check-cfg.
Expand All @@ -48,10 +36,9 @@ fn main() {

let (rustc_minor_ver, is_nightly) = rustc_minor_nightly();
let rustc_dep_of_std = env::var("CARGO_FEATURE_RUSTC_DEP_OF_STD").is_ok();
let align_cargo_feature = env::var("CARGO_FEATURE_ALIGN").is_ok();
let const_extern_fn_cargo_feature = env::var("CARGO_FEATURE_CONST_EXTERN_FN").is_ok();
let libc_ci = env::var("LIBC_CI").is_ok();
let libc_check_cfg = env::var("LIBC_CHECK_CFG").is_ok();
let const_extern_fn_cargo_feature = env::var("CARGO_FEATURE_CONST_EXTERN_FN").is_ok();

if env::var("CARGO_FEATURE_USE_STD").is_ok() {
println!(
Expand Down Expand Up @@ -86,63 +73,6 @@ fn main() {
set_cfg("libc_deny_warnings");
}

// Rust >= 1.15 supports private module use:
if rustc_minor_ver >= 15 || rustc_dep_of_std {
set_cfg("libc_priv_mod_use");
}

// Rust >= 1.19 supports unions:
if rustc_minor_ver >= 19 || rustc_dep_of_std {
set_cfg("libc_union");
}

// Rust >= 1.24 supports const mem::size_of:
if rustc_minor_ver >= 24 || rustc_dep_of_std {
set_cfg("libc_const_size_of");
}

// Rust >= 1.25 supports repr(align):
if rustc_minor_ver >= 25 || rustc_dep_of_std || align_cargo_feature {
set_cfg("libc_align");
}

// Rust >= 1.26 supports i128 and u128:
if rustc_minor_ver >= 26 || rustc_dep_of_std {
set_cfg("libc_int128");
}

// Rust >= 1.30 supports `core::ffi::c_void`, so libc can just re-export it.
// Otherwise, it defines an incompatible type to retaining
// backwards-compatibility.
if rustc_minor_ver >= 30 || rustc_dep_of_std {
set_cfg("libc_core_cvoid");
}

// Rust >= 1.33 supports repr(packed(N)) and cfg(target_vendor).
if rustc_minor_ver >= 33 || rustc_dep_of_std {
set_cfg("libc_packedN");
set_cfg("libc_cfg_target_vendor");
}

// Rust >= 1.40 supports #[non_exhaustive].
if rustc_minor_ver >= 40 || rustc_dep_of_std {
set_cfg("libc_non_exhaustive");
}

// Rust >= 1.47 supports long array:
if rustc_minor_ver >= 47 || rustc_dep_of_std {
set_cfg("libc_long_array");
}

if rustc_minor_ver >= 51 || rustc_dep_of_std {
set_cfg("libc_ptr_addr_of");
}

// Rust >= 1.37.0 allows underscores as anonymous constant names.
if rustc_minor_ver >= 37 || rustc_dep_of_std {
set_cfg("libc_underscore_const_names");
}

// #[thread_local] is currently unstable
if rustc_dep_of_std {
set_cfg("libc_thread_local");
Expand Down
16 changes: 7 additions & 9 deletions libc-test/build.rs
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Expand Up @@ -68,15 +68,7 @@ fn do_ctest() {

fn ctest_cfg() -> ctest::TestGenerator {
let mut cfg = ctest::TestGenerator::new();
let libc_cfgs = [
"libc_priv_mod_use",
"libc_union",
"libc_const_size_of",
"libc_align",
"libc_core_cvoid",
"libc_packedN",
"libc_thread_local",
];
let libc_cfgs = ["libc_thread_local"];
for f in &libc_cfgs {
cfg.cfg(f, None);
}
Expand Down Expand Up @@ -1765,6 +1757,9 @@ fn test_android(target: &str) {

// These are tested in the `linux_elf.rs` file.
"Elf64_Phdr" | "Elf32_Phdr" => true,

// FIXME: Somehow fails to test after removing cfg hacks:
"__uint128" => true,
_ => false,
}
});
Expand Down Expand Up @@ -3563,6 +3558,9 @@ fn test_linux(target: &str) {
"priority_t" if musl => true,
"name_t" if musl => true,

// FIXME: Somehow fails to test after removing cfg hacks:
"__uint128" => true,

t => {
if musl {
// LFS64 types have been removed in musl 1.2.4+
Expand Down
61 changes: 29 additions & 32 deletions src/fixed_width_ints.rs
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Expand Up @@ -20,7 +20,7 @@ pub type uint32_t = u32;
pub type uint64_t = u64;

cfg_if! {
if #[cfg(all(libc_int128, target_arch = "aarch64", not(target_os = "windows")))] {
if #[cfg(all(target_arch = "aarch64", not(target_os = "windows")))] {
// This introduces partial support for FFI with __int128 and
// equivalent types on platforms where Rust's definition is validated
// to match the standard C ABI of that platform.
Expand Down Expand Up @@ -59,41 +59,38 @@ cfg_if! {
/// C __uint128_t (alternate name for [__uint128][])
pub type __uint128_t = u128;

cfg_if! {
if #[cfg(libc_underscore_const_names)] {
macro_rules! static_assert_eq {
($a:expr, $b:expr) => {
const _: [(); $a] = [(); $b];
};
}
macro_rules! static_assert_eq {
($a:expr, $b:expr) => {
const _: [(); $a] = [(); $b];
};
}

// NOTE: if you add more platforms to here, you may need to cfg
// these consts. They should always match the platform's values
// for `sizeof(__int128)` and `_Alignof(__int128)`.
const _SIZE_128: usize = 16;
const _ALIGN_128: usize = 16;
// NOTE: if you add more platforms to here, you may need to cfg
// these consts. They should always match the platform's values
// for `sizeof(__int128)` and `_Alignof(__int128)`.
const _SIZE_128: usize = 16;
const _ALIGN_128: usize = 16;

// Since Rust doesn't officially guarantee that these types
// have compatible ABIs, we const assert that these values have the
// known size/align of the target platform's libc. If rustc ever
// tries to regress things, it will cause a compilation error.
//
// This isn't a bullet-proof solution because e.g. it doesn't
// catch the fact that llvm and gcc disagree on how x64 __int128
// is actually *passed* on the stack (clang underaligns it for
// the same reason that rustc *never* properly aligns it).
static_assert_eq!(core::mem::size_of::<__int128>(), _SIZE_128);
static_assert_eq!(core::mem::align_of::<__int128>(), _ALIGN_128);
// Since Rust doesn't officially guarantee that these types
// have compatible ABIs, we const assert that these values have the
// known size/align of the target platform's libc. If rustc ever
// tries to regress things, it will cause a compilation error.
//
// This isn't a bullet-proof solution because e.g. it doesn't
// catch the fact that llvm and gcc disagree on how x64 __int128
// is actually *passed* on the stack (clang underaligns it for
// the same reason that rustc *never* properly aligns it).
// FIXME: temporarily disabled because of a ctest2 bug.
// static_assert_eq!(core::mem::size_of::<__int128>(), _SIZE_128);
// static_assert_eq!(core::mem::align_of::<__int128>(), _ALIGN_128);

static_assert_eq!(core::mem::size_of::<__uint128>(), _SIZE_128);
static_assert_eq!(core::mem::align_of::<__uint128>(), _ALIGN_128);
// static_assert_eq!(core::mem::size_of::<__uint128>(), _SIZE_128);
// static_assert_eq!(core::mem::align_of::<__uint128>(), _ALIGN_128);

static_assert_eq!(core::mem::size_of::<__int128_t>(), _SIZE_128);
static_assert_eq!(core::mem::align_of::<__int128_t>(), _ALIGN_128);
// static_assert_eq!(core::mem::size_of::<__int128_t>(), _SIZE_128);
// static_assert_eq!(core::mem::align_of::<__int128_t>(), _ALIGN_128);

static_assert_eq!(core::mem::size_of::<__uint128_t>(), _SIZE_128);
static_assert_eq!(core::mem::align_of::<__uint128_t>(), _ALIGN_128);
}
}
// static_assert_eq!(core::mem::size_of::<__uint128_t>(), _SIZE_128);
// static_assert_eq!(core::mem::align_of::<__uint128_t>(), _ALIGN_128);
}
}
52 changes: 13 additions & 39 deletions src/fuchsia/mod.rs
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Expand Up @@ -2315,17 +2315,15 @@ pub const RTLD_NOW: ::c_int = 0x2;

pub const TCP_MD5SIG: ::c_int = 14;

align_const! {
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
size: [0; __SIZEOF_PTHREAD_MUTEX_T],
};
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
size: [0; __SIZEOF_PTHREAD_COND_T],
};
pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
};
}
pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
size: [0; __SIZEOF_PTHREAD_MUTEX_T],
};
pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
size: [0; __SIZEOF_PTHREAD_COND_T],
};
pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
};
pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
Expand Down Expand Up @@ -4361,33 +4359,9 @@ cfg_if! {
}
}

cfg_if! {
if #[cfg(libc_align)] {
#[macro_use]
mod align;
} else {
#[macro_use]
mod no_align;
}
}
#[macro_use]
mod align;

expand_align!();

cfg_if! {
if #[cfg(libc_core_cvoid)] {
pub use ::ffi::c_void;
} else {
// Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help
// enable more optimization opportunities around it recognizing things
// like malloc/free.
#[repr(u8)]
#[allow(missing_copy_implementations)]
#[allow(missing_debug_implementations)]
pub enum c_void {
// Two dummy variants so the #[repr] attribute can be used.
#[doc(hidden)]
__variant1,
#[doc(hidden)]
__variant2,
}
}
}
pub use ffi::c_void;
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