Do not lose or reorder user-provided linker arguments
Linker arguments are potentially order-dependent, so the order in which `-C link-arg` and `-C link-args` options are passed to `rustc` should be preserved when they are passed further to the linker.
Also, multiple `-C link-args` options are now appended to each other rather than overwrite each other.
In other words, `-C link-arg=a -C link-args="b c" -C link-args="d e" -C link-arg=f` is now passed as `"a" "b" "c" "d" "e" "f"` and not as `"d" "e" "a" "f"`.
Addresses https://github.com/rust-lang/rust/pull/70505#issuecomment-606780163.
Rollup of 5 pull requests
Successful merges:
- #67797 (Query-ify Instance::resolve)
- #70777 (Don't import integer and float modules, use assoc consts)
- #70795 (Keep track of position when deleting from a BTreeMap)
- #70812 (Do not use "nil" to refer to `()`)
- #70815 (Enable layout debugging for `impl Trait` type aliases)
Failed merges:
r? @ghost
Do not use "nil" to refer to `()`
"nil" is not used in the [book](https://doc.rust-lang.org/book) or in the [standard library](https://doc.rust-lang.org/std) anywhere else. Because "nil" is often used in programming languages to refer to "None" or "null" I think it could be a little confusing for newcomers to see this type referred to as "nil".
Keep track of position when deleting from a BTreeMap
This improves the performance of drain_filter and is needed for future Cursor support for BTreeMap.
cc @ssomers
r? @Mark-Simulacrum
Don't import integer and float modules, use assoc consts
Stop importing the standard library integer and float modules to reach the `MIN`, `MAX` and other constants. They are available directly on the primitive types now.
This PR is a follow up of #69860 which made sure we use the new constants in documentation.
This type of change touches a lot of files, and previously all my assoc int consts PRs had collisions and were accepted only after a long delay. So I'd prefer to do it in smaller steps now. Just removing these imports seem like a good next step.
r? @dtolnay
Query-ify Instance::resolve
Split off from #65989
Instance::resolve is now a wrapper for a new `resolve_instance` query.
This greatly improves performance on several benchmarks
clarify comment in RawVec::into_box
On first reading I almost thought "len <= cap" would be all that there is to check here. Expand the comment to clarify that that is not the case.
Fix some aliasing issues in Vec
`Vec::extend` and `Vec::truncate` invalidated references into the vector even without reallocation, because they (implicitly) created a mutable reference covering the *entire* initialized part of the vector.
Fixes https://github.com/rust-lang/rust/issues/70301
I verified the fix by adding some new tests here that I ran in Miri.
Fix performance regression in debuginfo file_metadata.
Fixes performance regression caused by #69718.
Finding the `SourceFile` associated with a `FileName` called `get_source_file` on the `SourceMap`, which does a linear search through all files in the `SourceMap`.
This resolves the issue by passing the `SourceFile` in from the caller (which already had it available) instead of the `FileName`
Fixes#70785.
