Redox Cross Compilation #38401

jackpot51 · 2016-12-15T23:38:33Z

I will admit - there are things here that I wish I did not have to do. This completes the ability to create a cross compiler from the rust repository for x86_64-unknown-redox. I will document this PR with inline comments explaining some things.

View this gist to see how a cross compiler is built

Prior discussion of a smaller change is here: #38366

rust-highfive · 2016-12-15T23:38:46Z

r? @sfackler

(rust_highfive has picked a reviewer for you, use r? to override)

jackpot51

Hopefully these comments will help you navigate the changes.

jackpot51 · 2016-12-15T23:39:15Z

mk/cfg/x86_64-unknown-redox.mk

@@ -0,0 +1 @@
+# rustbuild-only target


The old build system is complicated to use, so there is no support for using it.

jackpot51 · 2016-12-15T23:39:31Z

src/liballoc_jemalloc/build.rs

@@ -36,7 +36,8 @@ fn main() {
    // targets, which means we have to build the alloc_jemalloc crate
    // for targets like emscripten, even if we don't use it.
    if target.contains("rumprun") || target.contains("bitrig") || target.contains("openbsd") ||
-       target.contains("msvc") || target.contains("emscripten") || target.contains("fuchsia") {
+       target.contains("msvc") || target.contains("emscripten") || target.contains("fuchsia") ||
+       target.contains("redox") {


We do not support jemalloc, so we will build with the dummy.

jackpot51 · 2016-12-15T23:40:36Z

src/liballoc_system/lib.rs

@@ -71,7 +72,49 @@ pub extern "C" fn __rust_usable_size(size: usize, align: usize) -> usize {
    imp::usable_size(size, align)
 }

-#[cfg(unix)]
+#[cfg(target_os = "redox")]
+mod imp {


Just so we have a stub for potentially using a libc allocator, we implement alloc_system similarly to how the unix implementation works. If desired, these two imp blocks could be combined.

You're the one defining the abi of the system allocator, so this is largely up to you. If you follow unix's malloc/free conventions then I'd recommend unifying with the above block for Unix. That handles bits and pieces such as alignment for more-aligned types (e.g. simd types).

I will probably change this to be different from Unix so that it defines externs that ralloc will fulfill.

jackpot51 · 2016-12-15T23:41:06Z

src/liballoc_system/lib.rs

+    use MIN_ALIGN;
+
+    pub unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
+        libc::malloc(size as libc::size_t) as *mut u8


memalign is not used like in the unix implementation, perhaps this is a problem

Yes I this is one case where I think you'll want to align with the implementation above. This really ends up just needing an allocator interface which supports alignment as an argument, and that's what memalign is targeted at.

Understood, thanks

jackpot51 · 2016-12-15T23:41:55Z

src/liballoc_system/lib.rs

@@ -19,6 +19,7 @@
            issue = "27783")]
 #![feature(allocator)]
 #![feature(staged_api)]
+#![cfg_attr(target_os = "redox", feature(libc))]


Note that ralloc is used as the default allocator in librust_back. What we have done here is to ensure that liballoc_system builds, as it is a required dependency of libstd. We never link to it, however.

jackpot51 · 2016-12-16T00:00:15Z

src/libstd/sys/redox/syscall/scheme.rs

@@ -0,0 +1,232 @@
+use core::{mem, slice};


This is the definition of a Redox scheme. It could probably be removed.

jackpot51 · 2016-12-16T00:00:32Z

src/libstd/sys/redox/syscall/x86.rs

@@ -0,0 +1,72 @@
+use super::error::{Error, Result};


This is the system call ABI definition for x86

jackpot51 · 2016-12-16T00:00:40Z

src/libstd/sys/redox/syscall/x86_64.rs

@@ -0,0 +1,72 @@
+use super::error::{Error, Result};


This is the system call ABI definition for x86_64

jackpot51 · 2016-12-16T00:01:04Z

src/libtest/lib.rs

@@ -914,6 +914,11 @@ fn use_color(opts: &TestOpts) -> bool {
    }
 }

+#[cfg(target_os = "redox")]
+fn stdout_isatty() -> bool {


Redox needs to support isatty. We return false as a safe alternative

jackpot51 · 2016-12-16T00:01:37Z

src/libtest/lib.rs

@@ -1103,6 +1108,12 @@ fn get_concurrency() -> usize {
        }
    }

+    #[cfg(target_os = "redox")]
+    fn num_cpus() -> usize {


Redox needs to provide a way to get the number of CPUs. We return 1 as a safe alternative

Add memalign to Redox (for use in allocator) This is required to satisfy a review item here: rust-lang/rust#38401

…edox_cross

jackpot51 · 2016-12-22T01:47:33Z

src/liballoc_system/lib.rs

@@ -19,7 +19,7 @@
            issue = "27783")]
 #![feature(allocator)]
 #![feature(staged_api)]
-#![cfg_attr(unix, feature(libc))]
+#![cfg_attr(any(unix, target_os = "redox"), feature(libc))]


For alloc_system, we simply reuse the unix setup to allow a libc implementation of an allocator

jackpot51 · 2016-12-22T01:47:55Z

src/liballoc_system/lib.rs

@@ -87,7 +87,7 @@ mod imp {
        }
    }

-    #[cfg(target_os = "android")]
+    #[cfg(any(target_os = "android", target_os = "redox"))]


Newlib does not contain posix_memalign, so we use memalign

jackpot51 · 2016-12-22T01:49:23Z

src/librustc_back/target/redox_base.rs

+        linker_is_gnu: true,
+        no_default_libraries: true,
+        lib_allocation_crate: "alloc_system".to_string(),
+        exe_allocation_crate: "alloc_system".to_string(),


We use alloc_system as the default allocator. I personally would like to use ralloc

RobertWHurst · 2016-12-22T07:29:53Z

Can't wait for this to land 👌🏻

jackpot51 · 2016-12-22T23:16:48Z

src/librustc_back/target/redox_base.rs

+            // Static link
+            "-static".to_string()
+        ],
+        late_link_args: vec![


We late link libc and libm so that they can be provided when binaries are linked, rather than using the compiler defaults.

brson · 2016-12-23T04:12:32Z

This looks great to me.

The only thing that bothers me here is target_family. I still don't want to define a new family. I think we should change the logic in the driver so that None means target_family is not defined, and change all the unix target definitions to define it as unix.

jackpot51 · 2016-12-23T05:24:02Z

Ok @brson - Please see c59bb49. A minor mistake was fixed in 4dcb867.

I changed all of the Unix platforms to target_family: Some("unix".to_string()) and the Windows platforms to Some("windows".to_string()). I changed Redox to None. I think I covered all the "bases" ;-).

I changed librustc/session/config.rs to accept target_family only from the target configuration, to insert it as cfg(target_family = "...") and if it is windows or unix, to insert it as cfg(...)

jackpot51 · 2016-12-23T05:25:18Z

src/librustc/session/config.rs

@@ -943,26 +943,20 @@ pub fn default_configuration(sess: &Session) -> ast::CrateConfig {
    let vendor = &sess.target.target.target_vendor;
    let max_atomic_width = sess.target.target.max_atomic_width();

-    let fam = if let Some(ref fam) = sess.target.target.options.target_family {
-        Symbol::intern(fam)
-    } else if sess.target.target.options.is_like_windows {


Since the windows platforms now correctly define target_family, this is no longer necessary.

jackpot51 · 2016-12-23T05:25:47Z

src/librustc_back/target/redox_base.rs

@@ -38,7 +38,7 @@ pub fn opts() -> TargetOptions {
        relocation_model: "static".to_string(),
        disable_redzone: true,
        eliminate_frame_pointer: false,
-        target_family: Some("redox".to_string()),
+        target_family: None,


Redox no longer has a family :-(

jackpot51 · 2016-12-23T05:26:07Z

src/librustc_back/target/windows_base.rs

@@ -24,6 +24,7 @@ pub fn opts() -> TargetOptions {
        staticlib_prefix: "".to_string(),
        staticlib_suffix: ".lib".to_string(),
        no_default_libraries: true,
+        target_family: Some("windows".to_string()),


Both the windows bases are covered

jackpot51 · 2016-12-23T05:26:54Z

src/librustc_back/target/apple_base.rs

@@ -37,6 +37,7 @@ pub fn opts() -> TargetOptions {
        function_sections: false,
        dynamic_linking: true,
        executables: true,
+        target_family: Some("unix".to_string()),


Everything that isn't windows, is set to unix. That includes Linux, OS X, iOS, DragonflyBSD, NetBSD, OpenBSD, FreeBSD, Bitrig, Solaris, Fuchsia, and Haiku

brson · 2016-12-23T05:39:45Z

@bors r+

I'm very happy with how this is turning out so far. I wish there wasn't so much cfg sprawl in non-std crates, but that's something we can figure out in the future.

Tagging with relnotes not only for the redox support, but also the breaking change to target_family.

bors · 2016-12-23T05:39:46Z

📌 Commit 4dcb867 has been approved by brson

bors · 2016-12-23T09:09:22Z

⌛ Testing commit 4dcb867 with merge 99913c5...

Redox Cross Compilation I will admit - there are things here that I wish I did not have to do. This completes the ability to create a cross compiler from the rust repository for `x86_64-unknown-redox`. I will document this PR with inline comments explaining some things. [View this gist to see how a cross compiler is built](https://gist.github.com/jackpot51/6680ad973986e84d69c79854249f2b7e) Prior discussion of a smaller change is here: #38366

bors · 2016-12-23T11:56:36Z

jackpot51 · 2016-12-23T14:15:06Z

Thanks @brson

Version 1.16.0 (2017-03-16) =========================== Language -------- * Lifetimes in statics and consts default to `'static`. [RFC 1623] * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * [Clean up semantics of `self` in an import list][38313] * [`Self` may appear in `impl` headers][38920] * [`Self` may appear in struct expressions][39282] Compiler -------- * [`rustc` now supports `--emit=metadata`, which causes rustc to emit a `.rmeta` file containing only crate metadata][38571]. This can be used by tools like the Rust Language Service to perform metadata-only builds. * [Levenshtein based typo suggestions now work in most places, while previously they worked only for fields and sometimes for local variables][38927]. Together with the overhaul of "no resolution"/"unexpected resolution" errors (#[38154]) they result in large and systematic improvement in resolution diagnostics. * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than `U`][38670] * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798] * [`rustc` no longer attempts to provide "consider using an explicit lifetime" suggestions][37057]. They were inaccurate. Stabilized APIs --------------- * [`VecDeque::truncate`] * [`VecDeque::resize`] * [`String::insert_str`] * [`Duration::checked_add`] * [`Duration::checked_sub`] * [`Duration::checked_div`] * [`Duration::checked_mul`] * [`str::replacen`] * [`str::repeat`] * [`SocketAddr::is_ipv4`] * [`SocketAddr::is_ipv6`] * [`IpAddr::is_ipv4`] * [`IpAddr::is_ipv6`] * [`Vec::dedup_by`] * [`Vec::dedup_by_key`] * [`Result::unwrap_or_default`] * [`<*const T>::wrapping_offset`] * [`<*mut T>::wrapping_offset`] * `CommandExt::creation_flags` * [`File::set_permissions`] * [`String::split_off`] Libraries --------- * [`[T]::binary_search` and `[T]::binary_search_by_key` now take their argument by `Borrow` parameter][37761] * [All public types in std implement `Debug`][38006] * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327] * [`Ipv6Addr` implements `From<[u16; 8]>`][38131] * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [std: Fix partial writes in `LineWriter`][38062] * [std: Clamp max read/write sizes on Unix][38062] * [Use more specific panic message for `&str` slicing errors][38066] * [`TcpListener::set_only_v6` is deprecated][38304]. This functionality cannot be achieved in std currently. * [`writeln!`, like `println!`, now accepts a form with no string or formatting arguments, to just print a newline][38469] * [Implement `iter::Sum` and `iter::Product` for `Result`][38580] * [Reduce the size of static data in `std_unicode::tables`][38781] * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`, `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement `Display`][38909] * [`Duration` implements `Sum`][38712] * [`String` implements `ToSocketAddrs`][39048] Cargo ----- * [The `cargo check` command does a type check of a project without building it][cargo/3296] * [crates.io will display CI badges from Travis and AppVeyor, if specified in Cargo.toml][cargo/3546] * [crates.io will display categories listed in Cargo.toml][cargo/3301] * [Compilation profiles accept integer values for `debug`, in addition to `true` and `false`. These are passed to `rustc` as the value to `-C debuginfo`][cargo/3534] * [Implement `cargo --version --verbose`][cargo/3604] * [All builds now output 'dep-info' build dependencies compatible with make and ninja][cargo/3557] * [Build all workspace members with `build --all`][cargo/3511] * [Document all workspace members with `doc --all`][cargo/3515] * [Path deps outside workspace are not members][cargo/3443] Misc ---- * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies the path to the Rust implementation][38589] * [The `armv7-linux-androideabi` target no longer enables NEON extensions, per Google's ABI guide][38413] * [The stock standard library can be compiled for Redox OS][38401] * [Rust has initial SPARC support][38726]. Tier 3. No builds available. * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No builds available. * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379] Compatibility Notes ------------------- * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * In this release, references to uninhabited types can not be pattern-matched. This was accidentally allowed in 1.15. * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [Clean up semantics of `self` in an import list][38313] [37057]: rust-lang/rust#37057 [37761]: rust-lang/rust#37761 [38006]: rust-lang/rust#38006 [38051]: rust-lang/rust#38051 [38062]: rust-lang/rust#38062 [38062]: rust-lang/rust#38622 [38066]: rust-lang/rust#38066 [38069]: rust-lang/rust#38069 [38131]: rust-lang/rust#38131 [38154]: rust-lang/rust#38154 [38274]: rust-lang/rust#38274 [38304]: rust-lang/rust#38304 [38313]: rust-lang/rust#38313 [38314]: rust-lang/rust#38314 [38327]: rust-lang/rust#38327 [38401]: rust-lang/rust#38401 [38413]: rust-lang/rust#38413 [38469]: rust-lang/rust#38469 [38559]: rust-lang/rust#38559 [38571]: rust-lang/rust#38571 [38580]: rust-lang/rust#38580 [38589]: rust-lang/rust#38589 [38670]: rust-lang/rust#38670 [38712]: rust-lang/rust#38712 [38726]: rust-lang/rust#38726 [38781]: rust-lang/rust#38781 [38798]: rust-lang/rust#38798 [38909]: rust-lang/rust#38909 [38920]: rust-lang/rust#38920 [38927]: rust-lang/rust#38927 [39048]: rust-lang/rust#39048 [39282]: rust-lang/rust#39282 [39379]: rust-lang/rust#39379 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen [cargo/3296]: rust-lang/cargo#3296 [cargo/3301]: rust-lang/cargo#3301 [cargo/3443]: rust-lang/cargo#3443 [cargo/3511]: rust-lang/cargo#3511 [cargo/3515]: rust-lang/cargo#3515 [cargo/3534]: rust-lang/cargo#3534 [cargo/3546]: rust-lang/cargo#3546 [cargo/3557]: rust-lang/cargo#3557 [cargo/3604]: rust-lang/cargo#3604 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md

jackpot51 added 10 commits December 15, 2016 16:31

Add redox target

341d2d1

Fix typo

c7aa284

Fix issue with setting cfg(unix)

a621d12

Use panic abort by default

d2707aa

Add Redox make config

ece703a

Use alloc_system as default allocation crate

f86e014

WIP: Cross-compilation for Redox target

3e7543a

Add start functions, switch allocation crate to ralloc

773a0a2

Add openlibm to redox

07e313d

Revert libstd/Cargo.toml to master

6d7c2ec

rust-highfive assigned sfackler Dec 15, 2016

jackpot51 commented Dec 16, 2016

View reviewed changes

jackpot51 mentioned this pull request Dec 16, 2016

Redox x86_64 target support #38366

Closed

jackpot51 added 9 commits December 20, 2016 11:17

Add arm syscalls

57bc1a9

Move start functions into libstd/rt

86f85c1

Link openlibm only in libstd

01157e6

Move rt into sys::rt, fix tidy

e55596f

Readd statvfs

65eecf8

Fix building without backtrace

fd4bc88

Static link openlibm

7697c72

Switch back to alloc_system

2ca1f0b

Fix tidy

bf50acb

jackpot51 mentioned this pull request Dec 21, 2016

Add memalign to Redox (for use in allocator) rust-lang/libc#478

Merged

bors added a commit to rust-lang/libc that referenced this pull request Dec 21, 2016

Auto merge of #478 - jackpot51:patch-1, r=alexcrichton

e49e9bb

Add memalign to Redox (for use in allocator) This is required to satisfy a review item here: rust-lang/rust#38401

jackpot51 added 2 commits December 21, 2016 11:38

Update liblibc, go back to lazy linking openlibm

e909e43

Merge branch 'redox_cross' of https://github.com/redox-os/rust into r…

92c8e0f

…edox_cross

jackpot51 commented Dec 22, 2016

View reviewed changes

jackpot51 added 2 commits December 21, 2016 20:19

Add RawFd traits for net

7d3ae87

In order to successfully build, go back to ralloc

e7b006d

Remove start functions, use newlib instead of openlibm + ralloc

1eb6c44

jackpot51 commented Dec 22, 2016

View reviewed changes

Revert rt.rs

2ddd117

jackpot51 added 2 commits December 22, 2016 22:01

Do not build emutls on Redox

474eb62

Correct target_family mess

c59bb49

jackpot51 commented Dec 23, 2016

View reviewed changes

Convert fam to Symbol

4dcb867

brson added the relnotes Marks issues that should be documented in the release notes of the next release. label Dec 23, 2016

bors merged commit 4dcb867 into rust-lang:master Dec 23, 2016

japaric mentioned this pull request Dec 23, 2016

When target_family is None, rustc sets it to unix. #38187

Closed

jackpot51 deleted the redox_cross branch December 23, 2016 14:17

jackpot51 mentioned this pull request Dec 23, 2016

Update liblibc to add Redox memalign #38563

Closed

est31 mentioned this pull request Jan 10, 2017

1.15 release notes #38966

Merged

Mark-Simulacrum mentioned this pull request Jun 7, 2018

Missing tokens in custom derive input generated by macro #51331

Closed

davidtwco mentioned this pull request Sep 20, 2023

target tier policy compliance #116004

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Redox Cross Compilation #38401

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Redox Cross Compilation #38401

Redox Cross Compilation #38401

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