Repository navigation
cc-wrapper: multi-target compilers aren't supported #2335
Description
Before #2315, we get the following warnings flooding our logs:
Warning: supplying the --target x86_64-pc-linux-elf != x86_64-unknown-linux-musl argument to a nix-wrapped compiler may not work correctly - cc-wrapper is currently not designed with multi-target compilers in mind. You may want to use an un-wrapped compiler instead.
which originate from https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/cc-wrapper/add-clang-cc-cflags-before.sh#L29.
The reason this warning appears, I speculate, is that we're building our compiler for one target, and building IncludeOS and our unikernels for another. This is necessary unless we want to build a single compiler for each target we want to work with, which is probably unnecessary.
See #2315 for a further discussion.
Activity
mazunki commentedon Oct 27, 2025
We should check how this behaves on aarch64/arm too.
The main questions to investigate and answer here is what the meaning of
-elfand-muslactually is, and how the compiler treats them. I suspect thepcvsunknownpiece doesn't matter that much, but the last component could potentially make a difference.