57b1d921a0
memfd_create is a glibc API, which is not present on uclibc I think the title says it all! The `armv7-unknown-linux-uclibceabihf` tier-3 target does not build without this change, and I suspect all other uclibc builds are broken as well. It's a good reminder to try to add some CI validation of the uclibc build, which I will try to do in a followup PR. To test this, get and unpack https://toolchains.bootlin.com/downloads/releases/toolchains/armv7-eabihf/tarballs/armv7-eabihf--uclibc--bleeding-edge-2020.08-1.tar.bz2 Note instances of `PATH_HERE` below which you'll have to customize for your system. config.toml: ``` [target.armv7-unknown-linux-uclibceabihf] linker = "/PATH_HERE/buildroot-armv7/output/host/usr/bin/arm-buildroot-linux-uclibcgnueabihf-gcc" runner = "qemu-arm -L /PATH_HERE/armv7-eabihf--uclibc--bleeding-edge-2020.08-1/arm-buildroot-linux-uclibcgnueabihf/sysroot/" ``` Then run: ``` cd libc-test CC_armv7_unknown_linux_uclibceabihf=/PATH_HERE/armv7-eabihf--uclibc--bleeding-edge-2020.08-1/bin/arm-buildroot-linux-uclibcgnueabihf-gcc cargo +nightly test -Zbuild-std --target armv7-unknown-linux-uclibceabihf ``` (if there's a way to include that `CC_armv7_etc` cross CC in the config.toml, I'm all ears!) |
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.github | ||
ci | ||
libc-test | ||
src | ||
tests | ||
.cirrus.yml | ||
.gitignore | ||
build.rs | ||
Cargo.toml | ||
CONTRIBUTING.md | ||
LICENSE-APACHE | ||
LICENSE-MIT | ||
README.md | ||
rustfmt.toml | ||
triagebot.toml |
libc - Raw FFI bindings to platforms' system libraries
libc
provides all of the definitions necessary to easily interoperate with C
code (or "C-like" code) on each of the platforms that Rust supports. This
includes type definitions (e.g. c_int
), constants (e.g. EINVAL
) as well as
function headers (e.g. malloc
).
This crate exports all underlying platform types, functions, and constants under
the crate root, so all items are accessible as libc::foo
. The types and values
of all the exported APIs match the platform that libc is compiled for.
More detailed information about the design of this library can be found in its associated RFC.
Usage
Add the following to your Cargo.toml
:
[dependencies]
libc = "0.2"
Features
-
std
: by defaultlibc
links to the standard library. Disable this feature to remove this dependency and be able to uselibc
in#![no_std]
crates. -
extra_traits
: allstruct
s implemented inlibc
areCopy
andClone
. This feature derivesDebug
,Eq
,Hash
, andPartialEq
. -
const-extern-fn
: Changes someextern fn
s intoconst extern fn
s. This feature requires a nightly rustc. -
deprecated:
use_std
is deprecated, and is equivalent tostd
.
Rust version support
The minimum supported Rust toolchain version is Rust 1.13.0 . 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 |
Platform support
Platform-specific documentation (master branch).
See
ci/build.sh
for the platforms on which libc
is guaranteed to build for each Rust
toolchain. The test-matrix at GitHub Actions and Cirrus CI show the
platforms in which libc
tests are run.
License
This project is licensed under either of
at your option.
Contributing
We welcome all people who want to contribute. Please see the contributing instructions for more information.
Contributions in any form (issues, pull requests, etc.) to this project must adhere to Rust's Code of Conduct.
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in libc
by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.