Target `aarch64-linux-android` link failure: unwind.

[flxo]

Checklist

• I've looked through the issues and pull requests for similar reports

Describe your issue

Building an empty bin crate for target aarch64-linux-android fails to link. The linker fails to find libunwind.

What target(s) are you cross-compiling for?

aarch64-linux-android

Which operating system is the host (e.g computer cross is on) running?

• macOS
• Windows
• Linux / BSD
• other OS (specify in description)

What architecture is the host?

• x86_64 / AMD64
• arm32
• arm64 (including Mac M1)

What container engine is cross using?

• docker
• podman
• other container engine (specify in description)

cross version

cross 0.2.5

Example

# cargo new hello; cd hello
     Created binary (application) `hello` package
# cross build --target=aarch64-linux-android 
Unable to find image 'ghcr.io/cross-rs/aarch64-linux-android:0.2.5' locally
0.2.5: Pulling from cross-rs/aarch64-linux-android
b549f31133a9: Already exists 
5fe2d3aad0c6: Already exists 
2981499a9ddc: Already exists 
b94a177f70bc: Already exists 
6e9b50ffe814: Already exists 
90520c3cd9d7: Already exists 
5443eeb7b936: Already exists 
4c964b2caea5: Already exists 
4247faed0467: Already exists 
8e533985c077: Already exists 
f5b36b351714: Already exists 
2c63c099f49f: Already exists 
94fe568d3a35: Already exists 
98ef90f21973: Already exists 
3717c64c061f: Already exists 
Digest: sha256:95b392e696c26ce8c575590f95422390b2ecad6ca3d505793c377eb9e904c73f
Status: Downloaded newer image for ghcr.io/cross-rs/aarch64-linux-android:0.2.5
   Compiling hello v0.1.0 (/project)
error: linking with `aarch64-linux-android-gcc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/rust/lib/rustlib/x86_64-unknown-linux-gnu/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/android-ndk/bin:/rust/bin" VSLANG="1033" "aarch64-linux-android-gcc" "/tmp/rustcPIkdMf/symbols.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.121jazbxfhvppcdm.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.150b0irb0y71mrkj.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.300zreki1apf9g2z.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.3ht21q5v15cqvpe7.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.an8iwp66o2a55g3.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.burnc5f2tpjyrjt.rcgu.o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222.d9p7w3vrg1p8tai.rcgu.o" "-Wl,--as-needed" "-L" "/target/aarch64-linux-android/debug/deps" "-L" "/target/debug/deps" "-L" "/rust/lib/rustlib/aarch64-linux-android/lib" "-Wl,-Bstatic" "/rust/lib/rustlib/aarch64-linux-android/lib/libstd-23f6c47aae02f4fb.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libpanic_unwind-dd4c6aba4a78bc98.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libobject-bcc6c119a206d477.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libmemchr-5281145ba046724b.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libaddr2line-e157fff41be82fdf.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libgimli-8e5eea0d2ed94e81.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/librustc_demangle-8f4ad2a15b1e07d9.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libstd_detect-a37a2c25716c50f3.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libhashbrown-1b2557db6f01d992.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libminiz_oxide-e6706b812290bb2e.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libadler-10555647242e659c.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/librustc_std_workspace_alloc-305c9d9b8a10b58c.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libunwind-558d53f3b8a8a676.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libcfg_if-d824b4454197377a.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/liblibc-7825b80898f450ef.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/liballoc-99d3deb75d569257.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/librustc_std_workspace_core-204652b261065580.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libcore-338253ac402410c2.rlib" "/rust/lib/rustlib/aarch64-linux-android/lib/libcompiler_builtins-1081644b311849f7.rlib" "-Wl,-Bdynamic" "-ldl" "-llog" "-lunwind" "-ldl" "-lm" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/rust/lib/rustlib/aarch64-linux-android/lib" "-o" "/target/aarch64-linux-android/debug/deps/hello-5024e77b3f20e222" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro,-znow" "-nodefaultlibs"
  = note: /android-ndk/bin/../lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lunwind
          clang90: error: linker command failed with exit code 1 (use -v to see invocation)
          

error: could not compile `hello` due to previous error
# 

Additional information / notes

Same build is fine for e.g aarch64-unknown-linux-gnu.

[TheCataliasTNT2k]

Try building it as debug version, this might work (if you just need it now).
I have a similar issue, but with pthread_atfork see #1221

[flxo]

I checked the latest HEAD of cross 99b8069 and the linker is happy. I didn't find something suspicious in the commit log. Pinned my cross installs and I'm fine for now.

[Emilgardis]

What version of rust are you using?

Does it work if you use rust before 1.68? say 1.67?

1.68 updated minimal NDK, which has only been fixed on main, not on 0.2.5, see #1023

[josephlr]

1.68 updated minimal NDK, which has only been fixed on main, not on 0.2.5, see #1023

Would it be possible to get a 0.2.6 release that includes the fix? We don't compile cross in our CI, so we're stuck on the latest pre-compiled release.

[flxo]

What version of rust are you using?

1.68

Does it work if you use rust before 1.68? say 1.67?

No. As expected. :-)

1.68 updated minimal NDK, which has only been fixed on main, not on 0.2.5, see #1023

That makes sense.

thanks!

[Emilgardis]

It would not be super easy to include it in 0.2.6, it would have to be made out-of-tree.

I'm considering releasing 0.3.0 soon, there's not a lot left and some of the stuff can be added in patch releases. I'll work on it this weekend

[nwtgck]

I have a similar problem.

Two weeks ago i686-linux-android could be built, but now it can not.

• two weeks ago: https://github.com/nwtgck/piping-server-rust/actions/runs/4411542886/jobs/7730146203#logs
• now: https://github.com/nwtgck/piping-server-rust/actions/runs/4512690296/jobs/7946492779 (I just added a " " space to a README.md.)

I'm not sure GitHub changes the GitHub Actions environment or cross is affected by some external environment.

---

edit:
GitHub updated Rust to 1.68.0 last week.

https://github.com/actions/runner-images/blame/0f6480a303676a2b8fe9b53b160112c1293fe699/images/linux/Ubuntu2004-Readme.md

Using Rust 1.67.0 solved my problem: https://github.com/nwtgck/piping-server-rust/actions/runs/4512963306/jobs/7947129405

[Emilgardis]

@nwtgck The issue is due to https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html being included in 1.68, the fix is for us to bump the NDK, which was done in #1023 as previously mentioned

[nwtgck]

I'm looking forward to the next release.

edit: Until the release, I added - run: rustup default 1.67.0 to my GitHub job step.