List possible keys of the -L rustc option.
Since `rustc --help -v` does not describe it, only *rustc.1* man page, but there is no man for Windows.
r? @alexcrichton
cc @steveklabnik
std: Change String::truncate to panic less
The `Vec::truncate` method does not panic if the length argument is greater than
the vector's current length, but `String::truncate` will indeed panic. This
semantic difference can be a bit jarring (e.g. #32717), and after some
discussion the libs team concluded that although this can technically be a
breaking change it is almost undoubtedly not so in practice.
This commit changes the semantics of `String::truncate` to be a noop if
`new_len` is greater than the length of the current string.
Closes#32717
Get all (but one) of debuginfo tests to pass with MIR codegen.
I didn't get much feedback in #31005 so I went ahead and implemented something simple.
Closes#31005, as MIR debuginfo should work now for most usecases.
The `no-debug-attribute` test no longer assumes variables are in scope of `return`.
We might also want to revisit that in #32949, but the test is more reliable now either way.
In order to get one last function in the `associated-type` test pass, this PR also fixes#32790.
Implement `pub(restricted)` privacy (RFC 1422)
This implements `pub(restricted)` privacy from RFC 1422 (cc #32409) behind a feature gate.
`pub(restricted)` paths currently cannot use re-exported modules both for simplicity of implementation and for future compatibility with RFC 1560 (cf #31783).
r? @nikomatsakis
Clean out old documentation as well as the new test/tools directories. Should
prevent a problem that happened this morning where a PR bounced and then it left
docs with "broken links" so all future PRs bounced.
It's using Copy as a trait object compatible trait, which is not
appropriate, change to use a more typical Read + Send + Sync example.
Also use whitespace around `+`.
Once upon a time, along with START_BLOCK and END_BLOCK in the castle of important blocks also lived
a RESUME_BLOCK (or was it UNWIND_BLOCK? Either works, I don’t remember anymore). This trinity of
important blocks were required to always exist from the birth to death of the MIR-land they
belonged to.
Some time later, it was discovered that RESUME_BLOCK was just a lazy goon enjoying comfortable life
in the light of fame of the other two. Needless to say, once found out, the RESUME_BLOCK was
quickly slain and disposed of.
Now, the all-seeing eye of ours discovers that END_BLOCK is actually the more evil and better
disguised twin of the slain RESUME_BLOCK. Thus END_BLOCK gets slain and quickly disposed
of. Glory to the START_BLOCK, one and only lord of the important blocks’ castle!
---
Basically, all this does, is removing restriction for END_BLOCK to exist past the first invocation
of RemoveDeadBlocks pass. This way for functions whose CFG does not reach the `END_BLOCK` end up
not containing the block.
As far as the implementation goes, I’m not entirely satisfied with the `BasicBlock::end_block`, I
had hoped to make `new` a `const fn` and then just have a `const END_BLOCK` private to mir::build,
but it turns out that constant functions don’t yet support conditionals nor a way to assert.
Add initial version of codegen unit partitioning for incremental compilation.
The task of the partitioning module is to take the complete set of translation items of a crate and produce a set of codegen units from it, where a codegen unit is a named set of (translation-item, linkage) pairs. That is, this module decides which translation item appears in which codegen units with which linkage.
This version only handles the case of partitioning for incremental compilation, not the regular N-codegen units case. In the future the regular case should be handled too, maybe even doing a bit more analysis to intelligently figure out a good partitioning.
One thing that could be improved is the syntax of the codegen unit tests. Right now they still use the compile-fail error specification infrastructure, so everything has to be on one line. Would be nice to be able to format things in a more readable way.
Currently the `rust-std` package produced by rustbuild only contains the
standard library plus libtest, but the makefiles actually produce a `rust-std`
package with all known target libraries (including libsyntax, librustc, etc).
Tweak the behavior so the dependencies of the `dist-docs` step in rustbuild
depend on the compiler libraries as well (so that they're all packaged).
Closes#32984
Reading this, one item stood out a bit. Small improvements here.
. ‘Compile-time’ is not a noun, ‘compilation time’ was meant;
. Mathematical formulas are best not rendered as code;
. Use the same tense as in other items.
alloc_system: Handle failure properly
The Unix implementation was incorrectly handling failure for reallocation of
over-aligned types by not checking for NULL.
Closes#32993
Restore trait impl docs
Currently, documentation on methods in trait implementations doesn't get rendered. This changes that; trait implementations have all documentation associated with impl items displayed (documentation from the trait definition is ignored).
Fixes#24838Fixes#26871
Doc fix: Update Cargo.toml in book/getting-started
The Cargo.toml mentioned in book/getting-started
is missing the section called `[dependencies]`
fixes https://github.com/rust-lang/rust/issues/32928
rustbuild: Verify sha256 of downloaded tarballs
Here's a quick first pass at this.
I don't use Python often enough to claim that this is totally Pythonic. I've left off some (almost certainly unnecessary) error handling regarding opening and processing files. The whole tarball is read into memory to calculate the hash, but the file isn't *so* large so that should be fine. I don't care for the output from `raise RuntimeError`, but that's how `run()` does it so I'm following precedent.
Tested by manually changing the value of `expected`, and by modifying the tarball then forcing `rustc_out_of_date()`. Both cases tripped the error.
Closes https://github.com/rust-lang/rust/issues/32902
Fix macro hygiene bug
This fixes#32922 (EDIT: and fixes#31856), macro hygiene bugs.
It is a [breaking-change]. For example, the following would break:
```rust
fn main() {
let x = true;
macro_rules! foo { () => {
let x = 0;
macro_rules! bar { () => {x} }
let _: bool = bar!();
//^ `bar!()` used to resolve the first `x` (a bool),
//| but will now resolve to the second x (an i32).
}}
foo! {};
}
```
r? @nrc
Extends rustdoc on how to caputure output
- The documentation is quite about how to caputure a process' output when using
` std::process::Child::wait_with_output()`.
- This PR adds an example for this particular use case.
cargotest: Put output in build directory
Right now cargotest uses `TempDir` to place output into the system temp
directory, but unfortunately this means that if the process is interrupted then
it'll leak the directory and that'll never get cleaned up. One of our bots
filled up its disk space and there were 20 cargotest directories lying around so
seems prudent to clean them up!
By putting the output in the build directory it should ensure that we don't leak
too many extra builds.
