bjoernager/rust
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Delete the cfg(not(parallel)) serial compiler

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Since it's inception a long time ago, the parallel compiler and its cfgs
have been a maintenance burden. This was a necessary evil the allow
iteration while not degrading performance because of synchronization
overhead.

But this time is over. Thanks to the amazing work by the parallel
working group (and the dyn sync crimes), the parallel compiler has now
been fast enough to be shipped by default in nightly for quite a while
now.
Stable and beta have still been on the serial compiler, because they
can't use `-Zthreads` anyways.
But this is quite suboptimal:
- the maintenance burden still sucks
- we're not testing the serial compiler in nightly

Because of these reasons, it's time to end it. The serial compiler has
served us well in the years since it was split from the parallel one,
but it's over now.

Let the knight slay one head of the two-headed dragon!
This commit is contained in:
Noratrieb 2024-10-28 18:51:12 +01:00 • committed by clubby789
parent 00ed73cdc0
commit 505b8e1332
42 changed files with 487 additions and 1087 deletions
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5
compiler/rustc_query_impl/Cargo.toml
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@ -19,8 +19,3 @@ rustc_span = { path = "../rustc_span" }
thin-vec = "0.2.12"
tracing = "0.1"
# tidy-alphabetical-end
[features]
# tidy-alphabetical-start
rustc_use_parallel_compiler = ["rustc_query_system/rustc_use_parallel_compiler"]
# tidy-alphabetical-end