aarch64-unknown-linux-musl use -lunwind, but my embedded system has no unwind

[Sword-Destiny]

I got error when cross compile aarch64-unknown-linux-musl target。

          ld.lld: error: unable to find library -lunwind
          clang-12: error: linker command failed with exit code 1 (use -v to see invocation)

my embedded system have no unwind lib

[Sword-Destiny]

I set panic = "abort" in Cargo.toml, why still -lunwind exists?

[Jules-Bertholet]

@rustbot label A-linkage C-bug O-AArch64 O-linux O-musl

[Sword-Destiny]

the aarch64-unknown-linux-musl target use crt-static=true as default.
to avoid this error, We can add -Ctarget-feature=-crt-static in rustflags

[Sword-Destiny]

the aarch64-unknown-linux-musl target use crt-static=true as default. to avoid this error, We can add -Ctarget-feature=-crt-static in rustflags

I think this the reason why -lunwind been added automatically.

at the file:
https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/base/linux_musl.rs

    // These targets statically link libc by default
    base.crt_static_default = true;

and the final compiler command line will contains this:

 "-Wl,-Bstatic" "-lunwind" "-lc"

[Ragnt]

This is still a problem. You currently cannot build static libraries for musl targets unless you have a custom toolchain that includes libunwind.