Replace handwritten `Debug` impls with derives

`s_no_extra_traits!` doesn't derive `Debug` so there are a lot of
handwritten implementations. However, since we have a derive-like
solution for unions

Replace handwritten `Debug` impls with derives

`s_no_extra_traits!` doesn't derive `Debug` so there are a lot of
handwritten implementations. However, since we have a derive-like
solution for unions now (printing them like an opaque struct), there
really isn't any reason these can't all be derived.

Add `derive(Debug)` to `s_no_extra_traits`, still gated behind `feature
= "extra_traits"`, which allows getting rid of manual implementations.

(backport <https://github.com/rust-lang/libc/pull/4471>)
(cherry picked from commit 65c39bf1b0c7b904cf512280860120307d17703b)

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Introduce a new `c_enum` macro

Our current `e!` macro makes it easy to run into UB if C headers add a
variant that isn't represented in the Rust version. Add a path to
migrate away from this by intr

Introduce a new `c_enum` macro

Our current `e!` macro makes it easy to run into UB if C headers add a
variant that isn't represented in the Rust version. Add a path to
migrate away from this by introducing the `c_enum!` macro which
represents a C enum as Rust constants and a type alias.

Part of [1].

[1]: https://github.com/rust-lang/libc/issues/4419

(backport <https://github.com/rust-lang/libc/pull/4420>)
(cherry picked from commit 62051ca277a78d9af4912d7957fa5ce3611183a0)

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Fix the `missing_abi` lint

Recent versions of Rust require the ABI always be specified for `extern`
functions, whereas it historically defaulted to `extern "C"`. Fix a few
cases where this lint now

Fix the `missing_abi` lint

Recent versions of Rust require the ABI always be specified for `extern`
functions, whereas it historically defaulted to `extern "C"`. Fix a few
cases where this lint now gets raised by specifying `extern "C"`.

(backport <https://github.com/rust-lang/libc/pull/4254>)
(cherry picked from commit c9a71dc2d31b73c00091a4082c1e989cee79f792)

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fix: make Debug impl for unions opaque

(backport <https://github.com/rust-lang/libc/pull/4176>)
(cherry picked from commit 6faa521f32fc11db9fc43a248a64463ce288b48d)

[ resolve conflicts and update b

fix: make Debug impl for unions opaque

(backport <https://github.com/rust-lang/libc/pull/4176>)
(cherry picked from commit 6faa521f32fc11db9fc43a248a64463ce288b48d)

[ resolve conflicts and update based on some main vs. 0.2 differences -
Trevor ]

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Fix the build with `rustc-dep-of-std`

Since [1] we use derive macros rather than manually implementing `Clone`
and `Copy`. However, this caused the build in `std` to start failing
since the `core` p

Fix the build with `rustc-dep-of-std`

Since [1] we use derive macros rather than manually implementing `Clone`
and `Copy`. However, this caused the build in `std` to start failing
since the `core` prelude is not available. This provides the derive
macros as well as `derive` itself.

Resolve this by using complete paths. Additionally allow
`internal_features` to suppress the warning using `link_cfg`, and change
to using global paths for all uses of `core`.

Link: https://github.com/rust-lang/libc/pull/4038 [1]

(backport <https://github.com/rust-lang/libc/pull/4158>)
(cherry picked from commit d69ad56bd8c12329780739d42f9ed8392814595b)

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Create an internal prelude

When building with `rustc-dep-of-std`, we don't get the core types
imported by default (`Clone`, `Copy`, `Option`). In order to avoid
needing to import these individually,

Create an internal prelude

When building with `rustc-dep-of-std`, we don't get the core types
imported by default (`Clone`, `Copy`, `Option`). In order to avoid
needing to import these individually, introduce a prelude that includes
them, along with commonly used C numeric types.

This allows cleaning up some of the `use` statements.

(backport <https://github.com/rust-lang/libc/pull/4161>)
(cherry picked from commit 30bc78b2ccc2d620cdd1f2ac16be083eff6dcabc)

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fix: Ensure that `const extern fn` is always enabled

In [1] this conditional was dropped in favor of a Cargo feature, which
was turned on by default in [2]. However, this did not help the case
where

fix: Ensure that `const extern fn` is always enabled

In [1] this conditional was dropped in favor of a Cargo feature, which
was turned on by default in [2]. However, this did not help the case
where `--no-default-features` is passed.

Unfortunately we still can't drop this config entirely since `ctest`
cannot parse the syntax, so change back to useing a `cfg` to control
constness rather than a Cargo feature.

Additionally, remove a portion of the macro's comment that is no longer
relevant.

Fixes: https://github.com/rust-lang/libc/issues/4149

[1]: https://github.com/rust-lang/libc/pull/4105
[2]: https://github.com/rust-lang/libc/pull/4134

(backport <https://github.com/rust-lang/libc/pull/4151>)
(cherry picked from commit e18ee8cd96e400291ca488ca879edeb27c8b1d73)

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Change from `$(,)?` to `$(,)*` for ctest

`ctest` sometimes reports a parsing failure but it isn't consistent (I
do not know why). Just use a less ideal older syntax for now, this is an
internal macr

Change from `$(,)?` to `$(,)*` for ctest

`ctest` sometimes reports a parsing failure but it isn't consistent (I
do not know why). Just use a less ideal older syntax for now, this is an
internal macro.

(backport <https://github.com/rust-lang/libc/pull/4120>)
(cherry picked from commit 27ad99414328a0589edf9b0b86792004dcb6925f)

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Adjust the `f!` macro to be more flexible

Currently this only matches `$body` if every line ends with a semicolon.
Make this simpler by just using the `block` matcher.

Additionally, allow a trailin

Adjust the `f!` macro to be more flexible

Currently this only matches `$body` if every line ends with a semicolon.
Make this simpler by just using the `block` matcher.

Additionally, allow a trailing comma.

(backport <https://github.com/rust-lang/libc/pull/4107>)
(cherry picked from commit 0ac42fd3d32f1719cb185cfafceaceff13a5195e)

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Small syncs from `main` to `libc-0.2`

Use `#[derive]` for `Copy`/`Clone` in `s!` and friends.

Allows use of `#[cfg]` to skip items in an `s!` block without creating
invalid, orphaned `impl` blocks.

(backport <https://github.com/rust-la

Use `#[derive]` for `Copy`/`Clone` in `s!` and friends.

Allows use of `#[cfg]` to skip items in an `s!` block without creating
invalid, orphaned `impl` blocks.

(backport <https://github.com/rust-lang/libc/pull/4038>)
(cherry picked from commit 44c548d00a68feebf80ebc919f3964d9330cc668)

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Drop the `libc_const_extern_fn` conditional

Additionally deprecate the `const-extern-fn` feature. This is possible
since the MSRV was increased to 1.63.

Make macros.rs more similar to what is on `main`

Drop the `ptr_addr_of` conditional

This is possible since increasing the MSRV to 1.63

Require rust >= 1.25 and drop libc_align conditional

This is mostly taken from Josh's work at [1], I just updated to account
for conflicts and new uses of `libc_align`.

[1]: https://github.com/rust

Require rust >= 1.25 and drop libc_align conditional

This is mostly taken from Josh's work at [1], I just updated to account
for conflicts and new uses of `libc_align`.

[1]: https://github.com/rust-lang/libc/pull/2845

Co-authored-by: Josh Triplett <[email protected]>

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Require rust >= 1.19 and drop libc_union conditional

This is mostly taken from Josh's work at
<https://github.com/rust-lang/libc/pull/2845>. I just updated to remove
all new uses of `libc_union` int

Require rust >= 1.19 and drop libc_union conditional

This is mostly taken from Josh's work at
<https://github.com/rust-lang/libc/pull/2845>. I just updated to remove
all new uses of `libc_union` introduced since then.

Co-authored-by: Josh Triplett <[email protected]>

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Do not dereference uninhabited types refs in Clone implementations

A reference to an uninhabited type should never be dereferenced:
this is UB. `Copy` should not be implemented on such a type, and
a

Do not dereference uninhabited types refs in Clone implementations

A reference to an uninhabited type should never be dereferenced:
this is UB. `Copy` should not be implemented on such a type, and
an upcoming Clippy lint (`uninhabited_reference`) may flag such
dereferences as suspicious.

Since those types are not structs, they do not need to get `Copy`
and `Clone` implementations. A `missing!` macro limits code
duplication.

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Clean up lints around unused macros

Allow unused macro rules

Suggest the `mach2` crate instead

Use ptr::addr_of when available

Allow attributes in `f!` and related macros

af_alg_iv: Move the deprecated attribute to the struct definition and specify version.

Make some inline functions like WIFEXITED and WEXITSTATUS const and safe

Create macros for defining Copy and Clone on psp's enums and parenthetical structs

Fix styling

Re-run CI