rust 1.84 + cross compiling to aarch64-apple-darwin results in curl linker error

[astelmashenko]

Hello, I't trying to cross-compile my cli tool from linux to apple darwin and got into issue, it is the same when I try to build in docker or on my local machine.

OS: linux (dockerhub rust:latest)
Rust/Cargo version: 1.84.0
Zig version (via pip3): ziglang-0.13.0.post1
cargo-zigbuild: v0.19.7

I run cargo zigbuild --target aarch64-apple-darwin and get the next error:

error: linking with `/root/.cache/cargo-zigbuild/0.19.7/zigcc-aarch64-apple-darwin-d40.sh` failed: exit status: 1
  |
  = note: env -u IPHONEOS_DEPLOYMENT_TARGET -u TVOS_DEPLOYMENT_TARGET -u XROS_DEPLOYMENT_TARGET LC_ALL="C" PATH="/usr/local/rustup/toolchains/1.84.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/usr/local/cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" ZERO_AR_DATE="1" 
...skip...
"/builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib" "-L" "/builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib" "-o" "/builds/utils/viaxcli/target/aarch64-apple-darwin/debug/deps/viax-c18d8eb63b48785b" "-Wl,-dead_strip" "-nodefaultlibs"
  = note: error: unable to find dynamic system library 'curl' using strategy 'paths_first'. searched paths:
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libnghttp2-sys-084da4b485a4e0f6/out/i/lib/libcurl.tbd
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libnghttp2-sys-084da4b485a4e0f6/out/i/lib/libcurl.dylib
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libnghttp2-sys-084da4b485a4e0f6/out/i/lib/libcurl.so
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libnghttp2-sys-084da4b485a4e0f6/out/i/lib/libcurl.a
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.tbd
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.dylib
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.so
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.a
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.tbd
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.dylib
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.so
            /builds/utils/viaxcli/target/aarch64-apple-darwin/debug/build/libz-sys-36007e0449839c1e/out/lib/libcurl.a
            /root/.cache/cargo-zigbuild/0.19.7/deps/libcurl.tbd
            /root/.cache/cargo-zigbuild/0.19.7/deps/libcurl.dylib
            /root/.cache/cargo-zigbuild/0.19.7/deps/libcurl.so
            /root/.cache/cargo-zigbuild/0.19.7/deps/libcurl.a

Any suggestions how to resolve it? Thanks.

[messense]

You need to compile a static curl for aarch64 macOS before hand and specific it in RUSTFLAGS, or enable the static-curl feature from curl crate.

[astelmashenko]

Hey, thanks for the suggestion. I now get linking error:

error: linking with `/home/inc/.cache/cargo-zigbuild/0.19.7/zigcc-aarch64-apple-darwin-d40.sh` failed: exit status: 1
  |
  = note: env -u IPHONEOS_DEPLOYMENT_TARGET -u TVOS_DEPLOYMENT_TARGET -u XROS_DEPLOYMENT_TARGET LC_ALL="C" PATH
...skip...
  = note: error: unable to find framework 'SystemConfiguration'. searched paths:  none
          error: unable to find framework 'Security'. searched paths:  none
          error: unable to find framework 'CoreFoundation'. searched paths:  none

Any thoughts on what could be wrong or missing?

[messense]

See ziglang/zig#1349, you need to bring your own Apple SDK for additional frameworks.

[astelmashenko]

I managed to compile it. Thanks a lot! Briefly:

1. I generated macos sdk https://github.com/tpoechtrager/osxcross?tab=readme-ov-file#packaging-the-sdk (Set a path to macos sdk export XCODEDIR=~/path_to/macos_sdk/Xcode.app)
2. Followed steps to compile https://actually.fyi/posts/zig-makes-rust-cross-compilation-just-work/
3. Extracted generated sdk into project dir mac_sdk/MacOSX12.3.sdk
4. Point 2 required modifications, here is a script I used as zcc

#!/bin/sh
export MACOS_SDK="`pwd`/mac_sdk/MacOSX12.3.sdk"
zig cc --sysroot $MACOS_SDK -L/usr/lib -I$MACOS_SDK/usr/include -F$MACOS_SDK/System/Library/Frameworks -framework CoreFoundation -target aarch64-macos $@

5. Created .cargo/config.toml

[target.aarch64-apple-darwin]
linker = "./zcc"

6. CC="/path-to-wrapper/zcc" cargo build --target aarch64-apple-darwin

And it worked!