Signed-off-by: JmPotato <[email protected]>

…causes

use a path variabale

Add well known values to `--check-cfg` implementation

This pull-request adds well known values for the well known names via `--check-cfg=values()`.

[RFC 3013: Checking conditional compilation at compile time](https://rust-lang.github.io/rfcs/3013-conditional-compilation-checking.html#checking-conditional-compilation-at-compile-time) doesn't define this at all, but this seems a nice improvement.
The activation is done by a empty `values()` (new syntax) similar to `names()` except that `names(foo)` also activate well known names while `values(aa, "aa", "kk")` would not.

As stated this use a different activation logic because well known values for the well known names are not always sufficient.
In fact this is problematic for every `target_*` cfg because of non builtin targets, as the current implementation use those built-ins targets to create the list the well known values.

The implementation is straight forward, first we gather (if necessary) all the values (lazily or not) and then we apply them.

r? ``@petrochenkov``

…ou-se

Clean up the std library's #![feature]s

Signed-off-by: JmPotato <[email protected]>

This is part of rust-lang#87766.

r? ``@m-ou-se``

only disable SIMD for doctests in Miri (not for the stdlib build itself)

Also we can enable library/core/tests/simd.rs now, Miri supports enough SIMD for that.

…rts-errors-for-asterisk-wildcard-syntax, r=estebank

Fix invalid `unresolved imports` errors for a single-segment import

closes rust-lang#90248

…ng, r=yaahc

Don't round stack size up for created threads in Windows

Fixes rust-lang#94454

Windows does the rounding itself, so there isn't a need to explicity do the rounding beforehand, as mentioned by ``@ChrisDenton`` in rust-lang#94454

> The operating system rounds up the specified size to the nearest multiple of the system's allocation granularity (typically 64 KB). To retrieve the allocation granularity of the current system, use the [GetSystemInfo](https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsysteminfo) function.

https://docs.microsoft.com/en-us/windows/win32/procthread/thread-stack-size