Whether for Rust's own `target_os`, LLVM's triples, or GNU config's, the
OS-related have fields have been for code running *on* that OS, not code
that is *part* of the OS.
The difference is huge, as syscall interfaces are nothing like
freestanding interfaces. Kernels are (hypervisors and other more exotic
situations aside) freestanding programs that use the interfaces provided
by the hardware. It's *those* interfaces, the ones external to the
program being built and its software dependencies, that are the content
of the target.
For the Linux Kernel in particular, `target_env: "gnu"` is removed for
the same reason: that `-gnu` refers to glibc or GNU/linux, neither of
which applies to the kernel itself.
Relates to #74247
Thanks @ojeda for catching some things.
Add a chapter on the test harness.
There isn't really any online documentation on the test harness, so this adds a chapter to the rustc book which provides information on how the harness works and details on the command-line options.
add s390x-unknown-linux-musl target
This is the first step in bringup for Rust on s390x.
The libc and std crates need modifications as well, but getting this upstream makes that work easier.
Add new `rustc` target for Arm64 machines that can target the iphonesimulator
This PR lands a new target (`aarch64-apple-ios-sim`) that targets arm64 iphone simulator, previously unreachable from Apple Silicon machines.
resolves#81632
r? `@shepmaster`
LLVM picks the right things to put into the compiled object file based
on the target deployment version.
We need to communicate it through the target triple.
Only with that LLVM will use the right commands in the file to make it
look and behave like code compiled for the arm64 iOS simulator target.
Add AArch64 big-endian and ILP32 targets
This PR adds 3 new AArch64 targets:
- `aarch64_be-unknown-linux-gnu`
- `aarch64-unknown-linux-gnu_ilp32`
- `aarch64_be-unknown-linux-gnu_ilp32`
It also fixes some ABI issues on big-endian ARM and AArch64.
This commit adds a new stable codegen option to rustc,
`-Csplit-debuginfo`. The old `-Zrun-dsymutil` flag is deleted and now
subsumed by this stable flag. Additionally `-Zsplit-dwarf` is also
subsumed by this flag but still requires `-Zunstable-options` to
actually activate. The `-Csplit-debuginfo` flag takes one of
three values:
* `off` - This indicates that split-debuginfo from the final artifact is
not desired. This is not supported on Windows and is the default on
Unix platforms except macOS. On macOS this means that `dsymutil` is
not executed.
* `packed` - This means that debuginfo is desired in one location
separate from the main executable. This is the default on Windows
(`*.pdb`) and macOS (`*.dSYM`). On other Unix platforms this subsumes
`-Zsplit-dwarf=single` and produces a `*.dwp` file.
* `unpacked` - This means that debuginfo will be roughly equivalent to
object files, meaning that it's throughout the build directory
rather than in one location (often the fastest for local development).
This is not the default on any platform and is not supported on Windows.
Each target can indicate its own default preference for how debuginfo is
handled. Almost all platforms default to `off` except for Windows and
macOS which default to `packed` for historical reasons.
Some equivalencies for previous unstable flags with the new flags are:
* `-Zrun-dsymutil=yes` -> `-Csplit-debuginfo=packed`
* `-Zrun-dsymutil=no` -> `-Csplit-debuginfo=unpacked`
* `-Zsplit-dwarf=single` -> `-Csplit-debuginfo=packed`
* `-Zsplit-dwarf=split` -> `-Csplit-debuginfo=unpacked`
Note that `-Csplit-debuginfo` still requires `-Zunstable-options` for
non-macOS platforms since split-dwarf support was *just* implemented in
rustc.
There's some more rationale listed on #79361, but the main gist of the
motivation for this commit is that `dsymutil` can take quite a long time
to execute in debug builds and provides little benefit. This means that
incremental compile times appear that much worse on macOS because the
compiler is constantly running `dsymutil` over every single binary it
produces during `cargo build` (even build scripts!). Ideally rustc would
switch to not running `dsymutil` by default, but that's a problem left
to get tackled another day.
Closes#79361
Add links to the source for the rustc and rustdoc books.
This adds a little icon in the upper-right corner of the books so that readers can find the source if they want to make changes or file issues. This is already included in several of the other books.
Update with status for various NetBSD ports.
The NetBSD ports of rust to aarch64, armv7*, i686, and powerpc**
all both build and run. Status is as of rust 1.47.0.
*) Natively requires repeated successive build attempts (`rustc` is
such a resource pig VM-consumption-wise), or run in a chroot
on an aarch64 host where the available VM space is 4GB instead
of the native 2GB.
**) Powerpc either requires `-latomic` in a directory searched by
default by `ld` or to be built within pkgsrc which has a patch and
support package to tackle this issue.
The NetBSD ports of rust to aarch64, armv7*, i686, and powerpc**
all both build and run.
*) Natively requires repeated successive build attempts (rustc is
such a resource pig VM-consumption-wise), or run in a chroot
on an aarch64 host where the available VM space is 4GB instead
of the native 2GB.
**) Powerpc either requires -latomic in a directory searched by
default by 'ld' or to be built within pkgsrc which has a patch
to tackle this.
Add exploit mitigations chapter to the rustc book
This section documents the exploit mitigations applicable to the Rust compiler when building programs for the Linux operating system on the AMD64 architecture and equivalent. This was done for a project I'm currently working on, and I hope it'll also be helpful to others.
This section documents the exploit mitigations applicable to the Rust
compiler when building programs for the Linux operating system on the
AMD64 architecture and equivalent.
Demote i686-unknown-freebsd to tier 2 compiler target
While technically the `i686-unknown-freebsd` target has been a tier 2 development platform for a long time, with full toolchain tarballs available on static.rust-lang.org, due to a bug in the manifest generation the target was never available for download through rustup.
The infrastructure team privately inquired the FreeBSD package maintainers, and they weren't relying on those tarballs either, so it's a fair assumption to say practically nobody is using those tarballs.
This PR then removes the CI builder that produces full tarballs for the target, and moves the compilation of `rust-std` for the target in `dist-various-2`. The `x86_64-unknown-freebsd` target is *not* affected.
cc `@rust-lang/infra` `@rust-lang/compiler` `@rust-lang/release`
r? `@Mark-Simulacrum`
While technically the i686-unknown-freebsd target has been a tier 2
development platform for a long time, with full toolchain tarballs
available on static.rust-lang.org, due to a bug in the manifest
generation the target was never available for download through rustup.
The infrastructure team privately inquired the FreeBSD package
maintainers, and they weren't relying on those tarballs either, so it's
a fair assumption to say practically nobody is using those tarballs.
This PR then removes the CI builder that produces full tarballs for the
target, and moves the compilation of rust-std for the target in
dist-various-2.
The x86_64-unknown-freebsd target is *not* affected.
Promote aarch64-pc-windows-msvc to Tier 2 Development Platform
Adds a GitHub Actions CI build for `aarch64-pc-windows-msvc` via cross-compilation on an x86_64 host.
This promotes `aarch64-pc-windows-msvc` from a Tier 2 Compilation Target (std) to a Tier 2 Development Platform (std+rustc+cargo+tools).
Fixes#72881
r? `@pietroalbini`
Add aarch64-unknown-linux-musl host builds
This adds aarch64-unknown-linux-musl to the hosts list and adds the build to the dist-arm-linux builder as `@Mark-Simulacrum` suggested to me in Zulip. `@jyn514` requested to be mentioned 😄
I had to update the config for crosstool-ng as it had a prompt about the glibc version.
I ran `src/ci/docker/run.sh dist-arm-linux` to test it.
```
Build completed successfully in 1:31:50
Compile requests 8180
Compile requests executed 8135
Cache hits 287
Cache misses 7848
Cache timeouts 0
Cache read errors 0
Forced recaches 0
Cache write errors 0
Compilation failures 0
Cache errors 0
Non-cacheable compilations 0
Non-cacheable calls 36
Non-compilation calls 9
Unsupported compiler calls 0
Average cache write 0.000 s
Average cache read miss 6.389 s
Average cache read hit 0.000 s
Cache location Local disk: "/sccache"
Cache size 202 MiB
Max cache size 10 GiB
== clock drift check ==
local time: Sun Sep 6 19:30:17 UTC 2020
network time: Sun, 06 Sep 2020 19:30:17 GMT
== end clock drift check ==
```
Only errors were in miri due to struct fields being private (already been reported [here](https://github.com/rust-lang/rust/issues/76337))
Edit: Maybe it is helpful if I add that it is a working compiler
```sh
/rust-nightly-aarch64-unknown-linux-musl # ash install.sh
install: creating uninstall script at /usr/local/lib/rustlib/uninstall.sh
install: installing component 'rustc'
install: installing component 'cargo'
install: installing component 'rls-preview'
install: installing component 'rust-analyzer-preview'
install: installing component 'clippy-preview'
install: installing component 'rustfmt-preview'
install: installing component 'llvm-tools-preview'
install: installing component 'rust-analysis-aarch64-unknown-linux-musl'
install: installing component 'rust-std-aarch64-unknown-linux-musl'
install: WARNING: failed to run ldconfig. this may happen when not installing as root. run with --verbose to see the error
Rust is ready to roll.
/ # cat test.rs
fn main() { println!("hello world"); }
/ # rustc test.rs
/ # ./test
hello world
# file test
test: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, not stripped
```
Yuki Okushi
yn0ga
John Ericson
Jakub Kulik
bors
Simonas Kazlauskas
Dylan DPC
Eric Huss
Jan-Erik Rediger
Ricky (deg4uss3r)
Ariadne Conill
Khem Raj
Jack Huey
Alex Crichton
Amanieu d'Antras
Mara Bos
Wesley Wiser
Havard Eidnes
Ondrej Perutka
Benedikt Terhechte
Jonas Schievink
Ramon de C Valle
Lzu Tao
Pietro Albini
Stephan
Philipp Oppermann
Jake Goulding
Mingye Wang
Arlo Siemsen
Alistair Francis