Move __getrandom_custom definition into a const block #344
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The target triple name was changed in rust-lang/rust#106429 While `rustc` known the old spelling of the triple, `rustup` does not, so the toolchain download was not working. Signed-off-by: Joe Richey <joerichey@google.com>
josephlr
changed the title
This supersedes #341, and makes the following changes - All the code for implementing `__getrandom_custom` is now in an **named** `const` block (unnamed consts require Rust 1.37) - I found this approch [here](https://internals.rust-lang.org/t/anonymous-modules/15441) - Nothing inside the block can be referenced outside of it - `__getrandom_custom` is marked `unsafe` - It can't be accessed externally, but is "logically" unsafe as it dereferences raw pointers - The type of the function is moved to a typedef, so we can check that the defined type matches that of `getrandom:getrandom`. - Use `::core::result::Result` instead of `Result` - Similar to use use of `from_raw_parts_mut` this prevents compilation errors if `Result` is redefined. Signed-off-by: Joe Richey <joerichey@google.com>
newpavlov
approved these changes
Mar 10, 2023
Merged
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This supersedes #341 (and depends on #343)
__getrandom_customis now in annamed
constblock (unnamed consts require Rust 1.37)__getrandom_customis markedunsafedereferences raw pointers
the defined type matches that of
getrandom:getrandom.::core::result::Resultinstead ofResultfrom_raw_parts_mutthis preventscompilation errors if
Resultis redefined.I checked that our
customtest still worked, and that the__getrandom_customfunction was no longer directly accessible from Rust code.Signed-off-by: Joe Richey joerichey@google.com