It does actually clean everything. You need to call ./y.sh prepare again if you ran clean all; otherwise, it will fail to find some stuff like rustc-std-workspace-alloc.

I opened an issue to improve the documentation in this regards. Thanks for testing all this: this will help me improve the documentation.

The setup to be able to use LTO is non-trivial for now (I hope to be able to fix this soon so that liblto_plugin.so is not required for the case where a linker plugin wasn’t not asked by the user, which is the default).

You need to have in your path the gcc built with the same version as libgccjit, which contains libexec/gcc/x86_64-pc-linux-gnu/15.0.0/liblto_plugin.so.

The issue here is that you didn’t provide --build-sysroot to ./y.sh test --release, so it cannot find the std crate.

Thanks for reporting this! I cannot reproduce with the following:

y prepare
y build --release
y build
y clean all

(it shows: Successfully ran clean all)

Could you please provide the commands you ran to get this? (It might also be easier for me to track this if you open an issue on GitHub since I don’t come here often.)

Also, thanks for the suggestion for better documentation: I created an issue for this.

Thanks for sponsoring me: I really appreciate.

I only ever worked on this project part time.

Could you please point to the relevant source code for these? From what I could find here, this doesn’t seem implemented for the LLVM backend either.

If VFP uses target-specific intrinsics, there’s a chance that this doesn’t work correctly in the GCC backend yet since our auto-generated mapping we have needs many adjustments and we only added the adjustments for x86-64.

Good. I’ll attempt to do that for the next update.

Do you mean the performance of the tests themselves? If so, how would you suggest that I measure this? By just comparing the execution time?