How to install armv7-unknown-linux-musleabihf

ankit_kumar · October 7, 2022, 8:40pm

Hello, I would like to install armv7-unknown-linux-musleabihf, I am trying to do it using

sudo apt install armv7-unknown-linux-musleabihf

However getting error

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package armv7-unknown-linux-musleabihf

Aiden2207 · October 7, 2022, 9:18pm

You can't add rust targets via apt, and you shouldn't try to get rust from there either. Assuming you're cross-compiling, then rustup target add armv7-unknown-linux-musleabihf should do the trick. If you get linker errors then add

[target.armv7-unknown-linux-musleabihf]
linker = "rust-lld"

to your .cargo/config.toml file.

If you aren't cross-compiling and want to install rust for development installing it via the standard method for linux should be fine.

bjorn3 · October 8, 2022, 12:23pm

That only works for bare metal targets and for windows. Linux requires gcc or clang as wrapper to tell the linker where libc can be found and several other flags that are necessary. Instead you have to use armv7-linux-musleabihf-gcc or however the gcc executable for this target is called as linker.

ankit_kumar · October 11, 2022, 1:29pm

Greetings,
Thank you for your response. This is my config.toml file

[target.armv7-unknown-linux-musleabihf]
linker = "armv7-linux-musleabihf-gcc"
rustflags = "-C target-cpu=cortex-a72"

[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"
rustflags = "-C target-cpu=cortex-a72"

I am still getting the same error

unning: "arm-linux-musleabihf-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-march=armv7-a" "-mfpu=vfpv3-d16" "-I" "src/zlib" "-fvisibility=hidden" "-DZ_SOLO" "-DSTDC" "-D_LARGEFILE64_SOURCE" "-D_POSIX_SOURCE" "-o" "/home/akumar/targetarm/target/armv7-unknown-linux-musleabihf/release/build/libz-sys-4915c883ed374848/out/lib/src/zlib/adler32.o" "-c" "src/zlib/adler32.c"
  running: "arm-linux-musleabihf-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-march=armv7-a" "-mfpu=vfpv3-d16" "-I" "src/zlib" "-fvisibility=hidden" "-DZ_SOLO" "-DSTDC" "-D_LARGEFILE64_SOURCE" "-D_POSIX_SOURCE" "-o" "/home/akumar/targetarm/target/armv7-unknown-linux-musleabihf/release/build/libz-sys-4915c883ed374848/out/lib/src/zlib/compress.o" "-c" "src/zlib/compress.c"

  --- stderr


  error occurred: Failed to find tool. Is `arm-linux-musleabihf-gcc` installed?


error: failed to run custom build command for `bzip2-sys v0.1.11+1.0.8`

Caused by:
  process didn't exit successfully: `/home/akumar/targetarm/target/release/build/bzip2-sys-31fd70081932c73a/build-script-build` (exit status: 1)
  --- stdout
  cargo:rerun-if-env-changed=BZIP2_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7-unknown-linux-musleabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7_unknown_linux_musleabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7-unknown-linux-musleabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7_unknown_linux_musleabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7-unknown-linux-musleabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7_unknown_linux_musleabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  TARGET = Some("armv7-unknown-linux-musleabihf")
  OPT_LEVEL = Some("3")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_armv7-unknown-linux-musleabihf = None
  CC_armv7_unknown_linux_musleabihf = None
  TARGET_CC = None
  CC = None
  CROSS_COMPILE = None
  CFLAGS_armv7-unknown-linux-musleabihf = None
  CFLAGS_armv7_unknown_linux_musleabihf = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("false")
  CARGO_CFG_TARGET_FEATURE = None
  running: "arm-linux-musleabihf-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-march=armv7-a" "-mfpu=vfpv3-d16" "-I" "bzip2-1.0.8" "-D_FILE_OFFSET_BITS=64" "-DBZ_NO_STDIO" "-o" "/home/akumar/targetarm/target/armv7-unknown-linux-musleabihf/release/build/bzip2-sys-22ccfb816aa14efa/out/lib/bzip2-1.0.8/blocksort.o" "-c" "bzip2-1.0.8/blocksort.c"
  running: "arm-linux-musleabihf-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-march=armv7-a" "-mfpu=vfpv3-d16" "-I" "bzip2-1.0.8" "-D_FILE_OFFSET_BITS=64" "-DBZ_NO_STDIO" "-o" "/home/akumar/targetarm/target/armv7-unknown-linux-musleabihf/release/build/bzip2-sys-22ccfb816aa14efa/out/lib/bzip2-1.0.8/huffman.o" "-c" "bzip2-1.0.8/huffman.c"

  --- stderr


  error occurred: Failed to find tool. Is `arm-linux-musleabihf-gcc` installed?

bjorn3 · October 11, 2022, 2:22pm

You will need to install arm-linux-musleabihf-gcc on your system.

ankit_kumar · October 11, 2022, 2:35pm

Thank you for your response, can you please guide me how can I install it? I tried doing it with apt but seems like it's not working.

bjorn3 · October 11, 2022, 5:05pm

Which distro are you using? Debian only provides the glibc variant in the gcc-arm-linux-gnueabihf package, but not the musl variant. If your distro doesn't provide it, you may be able to build it yourself using GitHub - richfelker/musl-cross-make: Simple makefile-based build for musl cross compiler I think.

Aiden2207 · October 11, 2022, 5:15pm

Another option would be to use clang, which is a lot easier when cross-compiling, especially for more niche targets. If you go that route, set the linker to "ld.lld" and then build CC=clang cargo build --target arm7-unknown-linux-musleabihf.

ankit_kumar · October 11, 2022, 11:41pm

I am using UBUNTU 20.04

bjorn3 · October 12, 2022, 12:20pm

Looks like ubuntu 20.04 only has glibc too.

ankit_kumar · October 12, 2022, 12:59pm

Do you have any suggestion as when I am using cargo -v build --release --target armv7-unknown-linux-gnueabihf to build I am getting the following error

     Running `rustc --crate-name http_body --edition=2018 /home/abc/.cargo/registry/src/github.com-1ecc6299db9ec823/http-body-0.3.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=b1e3ccb6a23e7840 -C extra-filename=-b1e3ccb6a23e7840 --out-dir /home/abbc/a/target/armv7-unknown-linux-gnueabihf/release/deps --target armv7-unknown-linux-gnueabihf -C linker=arm-linux-gnueabihf-gcc -L dependency=/home/akumar/targetarm/target/armv7-unknown-linux-gnueabihf/release/deps -L dependency=/home/akumar/targetarm/target/release/deps --extern bytes=/home/akumar/targetarm/target/armv7-unknown-linux-gnueabihf/release/deps/libbytes-5318421955a4f8ab.rmeta --extern http=/home/akumar/targetarm/target/armv7-unknown-linux-gnueabihf/release/deps/libhttp-bfe6be4f855d175c.rmeta --cap-lints allow`
error: failed to run custom build command for `libudev-sys v0.1.4`

Caused by:
  process didn't exit successfully: `/home/abc/a/target/release/build/libudev-sys-0463db1d4d4cbd4d/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=LIBUDEV_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR

  --- stderr
  thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "pkg-config has not been configured to support cross-compilation.\n\nInstall a sysroot for the target platform and configure it via\nPKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a\ncross-compiling wrapper for pkg-config and set it via\nPKG_CONFIG environment variable."', /home/akumar/.cargo/registry/src/github.com-1ecc6299db9ec823/libudev-sys-0.1.4/build.rs:38:41
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

ankit_kumar · October 21, 2022, 6:54pm

Hi, thank you for your help, can you please suggest which distro support musleabihf, I will try to use that also in addition to using clang as a safe option.

Aiden2207 · October 21, 2022, 8:16pm

All distros support musleabihf.

ankit_kumar · October 21, 2022, 8:36pm

Hi! Thank you for your response. If that is possible how can I install target.armv7-unknown-linux-musleabihf ? Please visit How to install armv7-unknown-linux-musleabihf - #10 by bjorn3 they have suggested that Ubuntu 20.04 does not support it.

Aiden2207 · October 21, 2022, 10:01pm

If you're doing it for rust, just use rustup target add armv7-unknown-linux-musleabihf. For clang, it should be installed out of the box. For GCC, you'd probably have to build it yourself.

Anyway, I just opened up a Linux VM, and to get a hello world to build for armv7-unknown-linux-musleabihf with clang and rust installed, I had to do three things:

install the target via rustup
set .cargo/config.toml to

[target.armv7-unknown-linux-musleabihf]
linker = "lld"

Invoke cargo via CC=clang cargo build --target=armv7-unknown-linux-musleabihf

That should be enough to get most crates built. Crates that depend on C or more platform specific apis might require more effort to get to build, but in that case, it should say in their documentation.

system · January 19, 2023, 10:02pm

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