Building libstd without libcompiler_builtins

[Zoxc]

After this mess there isn't a way to build libstd without building libcompiler_builtins (which is unable to build on my OS)

[Zoxc]

Could it be made a optional std dependency? That would work for me, since I build std out-of-tree with explicit features.

[Zoxc]

Actually I used Cargo's [replace] feature (which is broken) to replace compiler_builtins with a dummy crate.

[archshift]

This would be much appreciated.

[bjorn3]

compiler_builtins is unconditionally necessary when stack probing is enabled, as it is on x86_64. This is because rustc uses __rust_probestack as stack probe function and there is no system library providing this, just compiler_builtins. Why did compiler_builtins not compile on your system?

[Mark-Simulacrum]

Without details on the failed build I'm going to go ahead and close. I believe we currently support a Rust-only, but likely less optimized, compiler builtins (or are working towards that), which should be buildable pretty much everywhere Rust is.