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Cargo has a native enviroment variable for this.
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No need for this to be in `rustc.rs`
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This is always set, so let's just always set it elsewhere to reduce the
need for our `rustc.rs` shim.
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This is already handled by `__CARGO_DEFAULT_LIB_METADATA` so there's no
need to doubly do it.
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use the code generation parameter -Clinker (same parameter as rustc)
to control what linker to use for building the rustdoc test executables.
closes: #63816
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When deny-warnings is not specified or set to true, the behaviour is the same as before.
When deny-warnings is set to false, warnings are now allowed
Fixes #63911
Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
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Rename overflowing_{add,sub,mul} intrinsics to wrapping_{add,sub,mul}.
These confused @Gankra, and then, also me, especially since `overflowing_*` *methods* also exist, but they map to `*_with_overflow` intrinsics!
r? @oli-obk / @nikomatsakis cc @Mark-Simulacrum (on the rustbuild workaround)
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Remap paths for proc-macro crates.
The remap-debuginfo config option remaps paths in most crates, but it does not apply to proc-macros, so they are still non-reproducible. This patch fixes that.
I'm not completely sure if this is the best way to do this, but to get reproducible builds we need librustc_macros to be built with --remap-path-prefix. I was previously modifying Cargo to pass that argument to all child crates, so this seems simpler and more correct.
I did not add a test since there do not seem to be any existing tests for RUSTC_DEBUGINFO_MAP.
r? @alexcrichton
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The remap-debuginfo config option remaps paths in most crates, but it
does not apply to proc-macros, so they are still non-reproducible.
This patch fixes that.
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This is needed to permit us building core_arch which is a submodule dep
(so we can't snap it to the new beta compiler).
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Fix rebase
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rustbuild
Remove some random unnecessary lint `allow`s
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Also removes stage1, stage2 cfgs being passed to rustc to ensure that
stage1 and stage2 are only differentiated as a group (i.e., only through
not bootstrap).
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use SecRandomCopyBytes on macOS in Miri
This is a hack to fix https://github.com/rust-lang/miri/issues/686: on macOS, rustc will open `/dev/urandom` to initialize a `HashMap`. That's quite hard to emulate properly in Miri without a full-blown implementation of file descriptors. However, Miri needs an implementation of `SecRandomCopyBytes` anyway to support [getrandom](https://crates.io/crates/getrandom), so using it here should work just as well.
This will only have an effect when libstd is compiled specifically for Miri, but that will generally be the case when people use `cargo miri`.
This is clearly a hack, so I am opening this to start a discussion about whether we are okay with such a hack or not.
Cc @oli-obk
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This is result of squashing two revert commits:
Revert "compile all crates under test w/ -Zemit-stack-sizes"
This reverts commit 7d365cf27f4249fc9b61ba8abfc813abe43f1cb7.
Revert "bootstrap: build compiler-builtins with -Z emit-stack-sizes"
This reverts commit 8b8488ce8fc047282e7159343f30609417f9fa39.
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This commit adds a new wasm32-based target distributed through rustup,
supported in the standard library, and implemented in the compiler. The
`wasm32-unknown-wasi` target is intended to be a WebAssembly target
which matches the [WASI proposal recently announced.][LINK]. In summary
the WASI target is an effort to define a standard set of syscalls for
WebAssembly modules, allowing WebAssembly modules to not only be
portable across architectures but also be portable across environments
implementing this standard set of system calls.
The wasi target in libstd is still somewhat bare bones. This PR does not
fill out the filesystem, networking, threads, etc. Instead it only
provides the most basic of integration with the wasi syscalls, enabling
features like:
* `Instant::now` and `SystemTime::now` work
* `env::args` is hooked up
* `env::vars` will look up environment variables
* `println!` will print to standard out
* `process::{exit, abort}` should be hooked up appropriately
None of these APIs can work natively on the `wasm32-unknown-unknown`
target, but with the assumption of the WASI set of syscalls we're able
to provide implementations of these syscalls that engines can implement.
Currently the primary engine implementing wasi is [wasmtime], but more
will surely emerge!
In terms of future development of libstd, I think this is something
we'll probably want to discuss. The purpose of the WASI target is to
provide a standardized set of syscalls, but it's *also* to provide a
standard C sysroot for compiling C/C++ programs. This means it's
intended that functions like `read` and `write` are implemented for this
target with a relatively standard definition and implementation. It's
unclear, therefore, how we want to expose file descriptors and how we'll
want to implement system primitives. For example should `std::fs::File`
have a libc-based file descriptor underneath it? The raw wasi file
descriptor? We'll see! Currently these details are all intentionally
hidden and things we can change over time.
A `WasiFd` sample struct was added to the standard library as part of
this commit, but it's not currently used. It shows how all the wasi
syscalls could be ergonomically bound in Rust, and they offer a possible
implementation of primitives like `std::fs::File` if we bind wasi file
descriptors exactly.
Apart from the standard library, there's also the matter of how this
target is integrated with respect to its C standard library. The
reference sysroot, for example, provides managment of standard unix file
descriptors and also standard APIs like `open` (as opposed to the
relative `openat` inspiration for the wasi ssycalls). Currently the
standard library relies on the C sysroot symbols for operations such as
environment management, process exit, and `read`/`write` of stdio fds.
We want these operations in Rust to be interoperable with C if they're
used in the same process. Put another way, if Rust and C are linked into
the same WebAssembly binary they should work together, but that requires
that the same C standard library is used.
We also, however, want the `wasm32-unknown-wasi` target to be
usable-by-default with the Rust compiler without requiring a separate
toolchain to get downloaded and configured. With that in mind, there's
two modes of operation for the `wasm32-unknown-wasi` target:
1. By default the C standard library is statically provided inside of
`liblibc.rlib` distributed as part of the sysroot. This means that
you can `rustc foo.wasm --target wasm32-unknown-unknown` and you're
good to go, a fully workable wasi binary pops out. This is
incompatible with linking in C code, however, which may be compiled
against a different sysroot than the Rust code was previously
compiled against. In this mode the default of `rust-lld` is used to
link binaries.
2. For linking with C code, the `-C target-feature=-crt-static` flag
needs to be passed. This takes inspiration from the musl target for
this flag, but the idea is that you're no longer using the provided
static C runtime, but rather one will be provided externally. This
flag is intended to also get coupled with an external `clang`
compiler configured with its own sysroot. Therefore you'll typically
use this flag with `-C linker=/path/to/clang-script-wrapper`. Using
this mode the Rust code will continue to reference standard C
symbols, but the definition will be pulled in by the linker configured.
Alright so that's all the current state of this PR. I suspect we'll
definitely want to discuss this before landing of course! This PR is
coupled with libc changes as well which I'll be posting shortly.
[LINK]:
[wasmtime]:
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bootstrap: build crates under libtest with -Z emit-stack-sizes
Please see the comment in the diff for the rationale.
This change adds a `.stack_sizes` linker section to `libcompiler_builtins.rlib`
but this section is discarded by the linker by default so it won't affect the
binary size of most programs. It will, however, negatively affect the binary
size of programs that link to a recent release of the `cortex-m-rt` crate
because of the linker script that crate provides, but I have proposed a PR
(rust-embedded/cortex-m-rt#186) to solve the problem (which I originally
introduced :-)).
This change does increase the size of the `libcompiler_builtins.rlib` artifact we
distribute but the increase is in the order of (a few) KBs.
r? @alexcrichton
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Use the information same as rustc.
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r=ollie27
Rustdoc remove old style files
Reopening of #56577 (which I can't seem to reopen...).
I made the flag unstable so with this change, what was blocking the PR is now gone I assume.
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