Passes LLVM codegen and Emscripten link-time flags for exception
handling if and only if the panic strategy is `unwind`. Sets the
default panic strategy for Emscripten targets to `unwind`. Re-enables
tests that depend on unwinding support for Emscripten, including
`should_panic` tests.

This reverts commit 29d6aaa.

As rustbook now depends transitively on openssl, it needs access to the
rustc-workspace-hack/all-static feature to pick up openssl-sys/vendored.
This fixes the rust build with `all-static = true` on systems where
openssl is not installed (e.g. when cross-compiling).

We have a job in our CI (PR's x86_64-gnu-tools) that's supposed to run
only when a submodule is changed in the PR, and it works by having a
task at the start of the build that skips all the following tasks if the
condition isn't met.

Before this commit that task was gated with template parameters, which
is a unique feature of Azure Pipelines. To make our CI more generic this
commit switches the gate to use a simple environment variable plus a
condition, which should be supported on more CI providers.

Co-Authored-By: lzutao <taolzu@gmail.com>

…odule issues

…-E0740, r=Dylan-DPC

Create new error E0742 and add long error explanation

Part of rust-lang#61137.

Creates E0742 error code and add its long error explanation.

resolve: Turn the "non-empty glob must import something" error into a lint

This fixes rust-lang#62334 by changing the error to a lint warning the glob. I changed the test but I'm very unsure of what I did as I do not know how to correctly check for the warning

…ameter, r=alexcrichton

ci: refactor pr tools job skipping

We have a job in our CI (PR's x86_64-gnu-tools) that's supposed to run only when a submodule is changed in the PR, and it works by having a task at the start of the build that skips all the following tasks if the condition isn't met.

Before this commit that task was gated with template parameters, which is a unique feature of Azure Pipelines. To make our CI more generic this commit switches the gate to use a simple environment variable plus a condition, which should be supported on more CI providers.

This PR also extracts the skipping logic into a script.

r? @alexcrichton

Prevent help popup to disappear when clicking on it

Fixes rust-lang#65736.

r? @kinnison

…r=alexcrichton

Enable dist for MIPS64 musl targets

Continuing work in rust-lang#63165, necessary libc changes are in place and published so here we go!

add basic HermitCore support within libtest

This an extension to rust-lang#65167. The current pull request extend libtest to support HermitCore as target OS.

…chton

proc_macro: clean up bridge::client::__run_expand{1,2} a bit.

See commit titles/diffs for more details.

The first commit is made possible by rust-lang#53451 being fixed (almost a year ago).
The last commit should remove the need for `#[allow(improper_ctypes)]` in rust-lang#65134.

…richton

Update mdbook to 0.3.3

There are some new features of mdbook that I'd like to use in TRPL.

…crichton

Use rustc-workspace-hack for rustbook

As rustbook now depends transitively on openssl, it needs access to the
rustc-workspace-hack/all-static feature to pick up openssl-sys/vendored.
This fixes the rust build with `all-static = true` on systems where
openssl is not installed (e.g. when cross-compiling).

…tolnay

doc: use new feature gate for c_void type

Closes rust-lang#63694, closes rust-lang#55619

…matsakis

save-analysis: Account for async desugaring in async fn return types

Closes rust-lang#65590

When visiting the return type of an async function we need to take into account its desugaring, since it introduces a new definition under which the return type is redefined.

r? @nikomatsakis