appveyor: Upgrade to gcc for mingw 6.3.0
This commit sort of brings back #40777 by upgrading back to 6.3.0. While
investigating #40546 it was discovered that 6.3.0 appears to not spurious
fail in the same way that 6.2.0 does (which we're currently using). The
workaround for #40184 contained in #40777 did not work so this commit also
contains a different workaround for the gdb issue. We will not download the
6.2.0 version of gdb and use that instead of the default version that comes with
6.3.0.
I'm going to optimistically say...
Closes#40546
This commit sort of brings back #40777 by upgrading back to 6.3.0. While
investigating #40546 it was discovered that 6.3.0 appears to not spurious
fail in the same way that 6.2.0 does (which we're currently using). The
workaround for #40184 contained in #40777 did not work so this commit also
contains a different workaround for the gdb issue. We will not download the
6.2.0 version of gdb and use that instead of the default version that comes with
6.3.0.
I'm going to optimistically say...
Closes#40546
Support AddressSanitizer and ThreadSanitizer on x86_64-apple-darwin
[ASan](https://clang.llvm.org/docs/AddressSanitizer.html#supported-platforms) and [TSan](https://clang.llvm.org/docs/ThreadSanitizer.html#supported-platforms) are supported on macOS, and this commit enables their support.
The sanitizers are always built as `*.dylib` on Apple platforms, so they cannot be statically linked into the corresponding `rustc_?san.rlib`. The dylibs are directly copied to `lib/rustlib/x86_64-apple-darwin/lib/` instead.
Note, although Xcode also ships with their own copies of ASan/TSan dylibs, we cannot use them due to version mismatch.
----
~~There is a caveat: the sanitizer libraries are linked as `@rpath/` (due to https://reviews.llvm.org/D6018), so the user needs to additionally pass `-C rpath`:~~
**Edit:** Passing rpath is now automatic.
Improve the librustc on-demand/query API ergonomics.
Queries are now performed through these two forms:
* `tcx.type_of(def_id)` (the most common usage)
* `tcx.at(span).type_of(def_id)` (to provide a more specific location in the cycle stack)
Several queries were renamed to work better as method names, i.e. by suffixing with `_of`.
r? @nikomatsakis
More methods for str boxes. (reduce Box<[u8]> ↔ Box<str> transmutes)
This is a follow-up to #41096 that adds safer methods for converting between `Box<str>` and `Box<[u8]>`. They're gated under a different feature from the `&mut str` methods because they may be too niche to include in public APIs, although having them internally helps reduce the number of transmutes the standard library uses.
What's added:
* `From<Box<str>> for Box<[u8]>`
* `<Box<str>>::into_boxed_bytes` (just calls `Into::into`)
* `alloc::str` (new module)
* `from_boxed_utf8` and `from_boxed_utf8_unchecked`, defined in `alloc:str`, exported in `collections::str`
* exports `from_utf8_mut` in `collections::str` (missed from previous PR)
Clarify the doc index
With regards to the unstable book, the reference, and the
processes involved.
Also, fix up a link by pointing to the new tracking issue rather than
the older one.
Fixes#41285
r? @frewsxcv
Specify behavior of `write_all` for `ErrorKind::Interrupted` errors
Also spell out that read and write operations should be retried on
`ErrorKind::Interrupted` errors.
Fixes#38494.
Adds rust-windbg.cmd script
Adds rust-gdb/rust-lldb equivalent for windbg that loads the Rust .natvis files on start.
This change modifies the bootstrap code to add rust-windbg to bin and the .natvis files to lib/rustlib/etc.
Example usage from cmd or PowerShell:
```
rust-windbg -c "bu rs_f442289d74765418!rs::main;g" target\debug\rs.exe
```
Check privacy of trait items in all contexts
Fixes https://github.com/rust-lang/rust/issues/28514
This is a sufficiently rare scenario and it's currently guarded by `private_in_public` lint, so it shouldn't be a [breaking-change] in practice.
Run tests for the cargo submodule in tree
Previously the `cargotest` suite would run some arbitrary revision of Cargo's
test suite, but now that we're bundling it in tree we should be running the
Cargo submodule's test suite instead.
Implement Vec::splice and String::splice (RFC 1432)
RFC: rust-lang/rfcs#1432, tracking issue: #32310
A rebase of https://github.com/rust-lang/rust/pull/32355 with a few more tests.
Let me know if you have any ideas for more tests.
cc @SimonSapin
