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Until now, x86_64-pc-windows-gnu linked `rsbegin.o` and `rsend.o` just
like i686-pc-windows-gnu, even though they were no-ops for it.
This was likely done for the simplicity back when it was introduced.
Today the things are different and these startup/end objects harm other
features, like `build-std`. Given the demotion of i686-pc-windows-gnu
from tier 1, there is no point in hurting x86_64-pc-windows-gnu,
which remains a tier 1.
The files are still shipped in case downstream crates expect them, as in
case of the unmaintained `xargo`.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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Removes the backwards-compatible `LinkSelfContainedDefault`, by
incorporating the remaining specifics into `LinkSelfContained`.
Then renames the modern options to keep the old name.
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The "fallback" naming pre-dates introduction of `-Clink-self-contained`
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This switches Rust's WASI target to use crt1-command.o instead of
crt1.o, which enables support for new-style commands. By default,
new-style commands work the same way as old-style commands, so nothing
immediately changes here, but this will be needed by later changes to
enable support for typed arguments.
See here for more information on new-style commands:
- https://github.com/WebAssembly/wasi-libc/pull/203
- https://reviews.llvm.org/D81689
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For some targets, rustc uses a "CRT fallback", where it links CRT
object files it ships instead of letting the host compiler link
them.
On musl, rustc currently links crt1, crti and crtn (provided by
libc), but does not link crtbegin and crtend (provided by libgcc).
In particular, crtend is responsible for terminating the .eh_frame
section. Lack of terminator may result in segfaults during
unwinding, as reported in #47551 and encountered by the LLVM 12
update in #81451.
This patch links crtbegin and crtend for musl as well, following
the table at the top of crt_objects.rs.
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