Error with cross compilation to x86_64-unknown-linux-musl target

[josephrodriguez]

I have found these related issues/pull requests

The only similar issue that I found related to cross compilation to musl was this previous task, but is not the same one.

Description

Trying to compile the project with cross compilation from Debian docker image sharing the code in a volume from Ubuntu 24.04.2 OS to target x86_64-unknown-linux-musl I have the error:

Currently using clang as linker for this target.

error: linking with `clang` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/root/.cargo/bin:/snap/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" VSLANG="1033" "clang" "-m64" "/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/rcrt1.o" "/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crti.o" "/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtbeginS.o" "/tmp/rustcD5iCV2/symbols.o" "<1 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/tmp/rustcD5i
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: /usr/bin/ld: /tmp/rustcD5iCV2/liblibsqlite3_sys-e9e42eb6f2b48f5c.rlib(c877a2978823c39d-sqlite3.o):(.data.aSyscall+0xb0): undefined reference to `fcntl64’
          clang: error: linker command failed with exit code 1 (use -v to see invocation)
          
  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link

Installed the packages dependecies libsqlite3-dev, musl-tools and musl-dev but the error is still happening.

Reproduction steps

• Reference sqlx version 0.8.3
• Enable the features runtime-tokio-native-tls and sqlite
• Install clang, llvm, musl-tools and musl-dev packages
• Define linker = “clang”
• Define archiver ar = "llvm-ar”
• Define rustflags rustflags = ["-C", "target-feature=+crt-static"]
• Run cross compilation to x86_64-unknown-linux-musl target

[target.x86_64-unknown-linux-musl]
linker = "clang"
ar = "llvm-ar"
rustflags = ["-C", "target-feature=+crt-static"]

cargo build --target x86_64-unknown-linux-musl

SQLx version

0.8.3

Enabled SQLx features

runtime-tokio-native-tls, sqlite

Database server and version

Sqlite

Operating system

Ubuntu 24.04.2

Rust version

1.85.0

[josephrodriguez]

Seems like the issue is with musl targets because for aarch64-unknown-linux-musl target is the same error.