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Since the values for the fcntl constants can vary from architecture
to architecture, it is better to use the values defined in the libc
crate instead of assigning literals in the flock code which would
make the assumption that all architectures use the same values.
Fixes #57007
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I was dabbling recently seeing what it would take to compile `rustfmt` to the
`wasm32-unknown-unknown` target and it turns out not much effort is needed!
Currently `rustfmt` depends on a few rustc crates published to crates.io, so
this commit touches up those crates to compile for wasm themselves. Notably:
* The `rustc_data_structures` crate's `flock` implementation is stubbed out to
unconditionally return errors on unsupported platforms.
* The `rustc_errors` crate is extended to not do any locking for all non-windows
platforms.
In both of these cases if we port the compiler to new platforms the
functionality isn't critical but will be discovered over time as it comes up, so
this hopefully doesn't make it too too hard to compile to new platforms!
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`bad_style` is being deprecated in favor of `nonstandard_style`:
- https://github.com/rust-lang/rust/issues/41646
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flock structure is defined in asm*/fcntl.h. This file on android is
generated from the linux kernel source, so they are the same.
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* Hand rebased from Niels original work on 1.9.0
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