Auto merge of #140245 - matthiaskrgr:rollup-e0fwsfv, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #139261 (mitigate MSVC alignment issue on x86-32)
 - #140075 (Mention average in midpoint documentations)
 - #140184 (Update doc of cygwin target)
 - #140186 (Rename `compute_x` methods)
 - #140194 (minicore: Have `//@ add-core-stubs` also imply `-Cforce-unwind-tables=yes`)
 - #140195 (triagebot: label minicore changes w/ `A-test-infra-minicore` and ping jieyouxu on changes)
 - #140214 (Remove comment about handling non-global where bounds with corresponding projection)
 - #140228 (Revert overzealous parse recovery for single colons in paths)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

src/tests/minicore.md

@@ -6,25 +6,37 @@
 ui/codegen/assembly test suites. It provides `core` stubs for tests that need to
 build for cross-compiled targets but do not need/want to run.
 
+<div class="warning">
+Please note that [`minicore`] is only intended for `core` items, and explicitly
+**not** `std` or `alloc` items because `core` items are applicable to a wider
+range of tests.
+</div>
+
 A test can use [`minicore`] by specifying the `//@ add-core-stubs` directive.
 Then, mark the test with `#![feature(no_core)]` + `#![no_std]` + `#![no_core]`.
 Due to Edition 2015 extern prelude rules, you will probably need to declare
 `minicore` as an extern crate.
 
+## Implied compiler flags
+
 Due to the `no_std` + `no_core` nature of these tests, `//@ add-core-stubs`
 implies and requires that the test will be built with `-C panic=abort`.
-Unwinding panics are not supported.
+**Unwinding panics are not supported.**
+
+Tests will also be built with `-C force-unwind-tables=yes` to preserve CFI
+directives in assembly tests.
+
+TL;DR: `//@ add-core-stubs` implies two compiler flags:
+
+1. `-C panic=abort`
+2. `-C force-unwind-tables=yes`
+
+## Adding more `core` stubs
 
 If you find a `core` item to be missing from the [`minicore`] stub, consider
 adding it to the test auxiliary if it's likely to be used or is already needed
 by more than one test.
 
-<div class="warning">
-Please note that [`minicore`] is only intended for `core` items, and explicitly
-**not** `std` or `alloc` items because `core` items are applicable to a wider
-range of tests.
-</div>
-
 ## Example codegen test that uses `minicore`
 
 ```rust,no_run