[Rust] ARMv7 Android 빌드

Hello, world! 샘플을 ARMv7 Android용으로 빌드하는 방법에 대하여 설명합니다.

 

ARMv7 Androd는 Tier2 이기 때문에 빌드는 문제 없지만 사용하는 패키지에 따라서 동작상에 문제가 있을 수 있을 수 있습니다.

 

Rust의 Platform 지원 현황: doc.rust-lang.org/beta/rustc/platform-support.html

 

Host용으로 먼저 만들어 봅니다.

$ cargo new hello

$ cd hello

$ cargo run
   Compiling hello v0.1.0 (/home/zeper/tmp/rust/hello)
    Finished dev [unoptimized + debuginfo] target(s) in 0.52s
     Running `target/debug/hello`
Hello, world!

잘 되네요

 

 

Target(ARMv7 Android) 설정을 합니다.

 

먼저 아래 명령어로 지원하는 Target List를 확인해 봅니다.

$ rustup target list
aarch64-apple-darwin
aarch64-apple-ios
aarch64-fuchsia
aarch64-linux-android
aarch64-pc-windows-msvc
aarch64-unknown-linux-gnu
aarch64-unknown-linux-musl
aarch64-unknown-none
aarch64-unknown-none-softfloat
arm-linux-androideabi
arm-unknown-linux-gnueabi (installed)
arm-unknown-linux-gnueabihf
arm-unknown-linux-musleabi
arm-unknown-linux-musleabihf
armebv7r-none-eabi
armebv7r-none-eabihf
armv5te-unknown-linux-gnueabi
armv5te-unknown-linux-musleabi
armv7-linux-androideabi (installed)
armv7-unknown-linux-gnueabi (installed)
armv7-unknown-linux-gnueabihf (installed)
armv7-unknown-linux-musleabi
armv7-unknown-linux-musleabihf
armv7a-none-eabi (installed)
armv7r-none-eabi
armv7r-none-eabihf
asmjs-unknown-emscripten
i586-pc-windows-msvc
i586-unknown-linux-gnu
i586-unknown-linux-musl
i686-linux-android
i686-pc-windows-gnu
i686-pc-windows-msvc
i686-unknown-freebsd
i686-unknown-linux-gnu
i686-unknown-linux-musl
mips-unknown-linux-gnu
mips-unknown-linux-musl
mips64-unknown-linux-gnuabi64
mips64-unknown-linux-muslabi64
mips64el-unknown-linux-gnuabi64
mips64el-unknown-linux-muslabi64
mipsel-unknown-linux-gnu
mipsel-unknown-linux-musl
nvptx64-nvidia-cuda
powerpc-unknown-linux-gnu
powerpc64-unknown-linux-gnu
powerpc64le-unknown-linux-gnu
riscv32i-unknown-none-elf
riscv32imac-unknown-none-elf
riscv32imc-unknown-none-elf
riscv64gc-unknown-linux-gnu
riscv64gc-unknown-none-elf
riscv64imac-unknown-none-elf
s390x-unknown-linux-gnu
sparc64-unknown-linux-gnu
sparcv9-sun-solaris
thumbv6m-none-eabi
thumbv7em-none-eabi
thumbv7em-none-eabihf
thumbv7m-none-eabi
thumbv7neon-linux-androideabi
thumbv7neon-unknown-linux-gnueabihf
thumbv8m.base-none-eabi
thumbv8m.main-none-eabi
thumbv8m.main-none-eabihf
wasm32-unknown-emscripten
wasm32-unknown-unknown
wasm32-wasi
x86_64-apple-darwin
x86_64-apple-ios
x86_64-fortanix-unknown-sgx
x86_64-fuchsia
x86_64-linux-android
x86_64-pc-windows-gnu
x86_64-pc-windows-msvc
x86_64-rumprun-netbsd
x86_64-sun-solaris
x86_64-unknown-freebsd
x86_64-unknown-illumos
x86_64-unknown-linux-gnu (installed)
x86_64-unknown-linux-gnux32
x86_64-unknown-linux-musl
x86_64-unknown-netbsd
x86_64-unknown-redox

 

Target을 추가합니다.

$ rustup target add armv7-linux-androideabi
info: downloading component 'rust-std' for 'armv7-linux-androideabi'
info: installing component 'rust-std' for 'armv7-linux-androideabi'
info: using up to 500.0 MiB of RAM to unpack components
 18.5 MiB /  18.5 MiB (100 %)  15.7 MiB/s in  1s ETA:  0s

 

Target으로 빌드해 봅시다

$ cargo build --target=armv7-linux-androideabi
   Compiling hello v0.1.0 (/home/zeper/tmp/rust/hello)
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-Wl,--allow-multiple-definition" "-march=armv7-a" "-Wl,--eh-frame-hdr" "-L" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.1puxji1j4al5q2th.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.1venxgktxoit4xfy.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.29bn060081e4f81e.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.2w3q3wmuhih636y3.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.3cr4znzzex5qwdd2.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.4sz5506n9ooxqo40.rcgu.o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.569h0m7xwblhj3xh.rcgu.o" "-o" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.1wp905j662mlrn4i.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps" "-L" "/home/zeper/tmp/rust/hello/target/debug/deps" "-L" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libstd-cb0beac250436a0d.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libpanic_unwind-e434dcd9317d78c2.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libminiz_oxide-afa459219c4d92d6.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libadler-f57f538a958bc55d.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libobject-c8797db28b71e53c.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libaddr2line-bb211f245cec9142.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libgimli-a6ab61380c35ee99.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/librustc_demangle-4e4d81621f8f8e44.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libhashbrown-f6130bf85123b5dd.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/librustc_std_workspace_alloc-f0b4a50ac6fb811f.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libunwind-78a31eba47812823.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libcfg_if-8c49356d4184b030.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/liblibc-bc3ec46ad7e712af.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/liballoc-cb332653b205c56d.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/librustc_std_workspace_core-0ad625bb743eec22.rlib" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libcore-0dbd748a486ccd14.rlib" "-Wl,--end-group" "/home/zeper/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/armv7-linux-androideabi/lib/libcompiler_builtins-9259c2a9436ab113.rlib" "-Wl,-Bdynamic" "-ldl" "-llog" "-lgcc" "-lc" "-lm"
  = note: /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /usr/bin/ld: /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: Relocations in generic ELF (EM: 40)
          /home/zeper/tmp/rust/hello/target/armv7-linux-androideabi/debug/deps/hello-e649096974718c1d.13i238i1nw4f582w.rcgu.o: error adding symbols: File in wrong format
          collect2: error: ld returned 1 exit status


error: aborting due to previous error

error: could not compile `hello`

To learn more, run the command again with --verbose.

host 용 cc로 링크를 하려고 해서 링크 에러가 발생합니다.

 

Android용 Toolchain 설정 및 sysroot 설정해줍니다.

$ mkdir .cargo

$ vi .cargo/config

[target.armv7-linux-androideabi]
ar = "arm-linux-androideabi-ar"
linker = "arm-linux-androideabi-gcc"

[build]
rustflags = ["-C", "link-args=--sysroot=/home/zeper/target/build_sysroot/"]

sysroot는 CrossCompiler가 링크에 필요한 라이브러리 및 헤더파일들이 있는 위치가 됩니다.

 

 

 

위 config 파일을 생성하고 다시 빌드해봅니다.

$ cargo build --target=armv7-linux-androideabi
   Compiling hello v0.1.0 (/home/mjkim/tmp/rust/hello)
    Finished dev [unoptimized + debuginfo] target(s) in 0.61s

에러 없이 빌드가 됩니다.

arm-linux-androideabi-ar 을 찾을수 없다고 에러가 뜨면 PATH 환경변수에 적절히 추가합니다.

 

 

실행파일이 잘 생성됐는지 확인해 보면 ARM 용으로 잘 빌드 됐음을 확인 할 수 있습니다.

$ file target/armv7-linux-androideabi/debug/hello
target/armv7-linux-androideabi/debug/hello: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /system/bin/linker, with debug_info, not stripped

$ readelf -A target/armv7-linux-androideabi/debug/hello
Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "ARM v7"
  Tag_CPU_arch: v7
  Tag_CPU_arch_profile: Application
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-2
  Tag_FP_arch: VFPv3
  Tag_Advanced_SIMD_arch: NEONv1
  Tag_ABI_PCS_GOT_use: GOT-indirect
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_enum_size: int
  Tag_ABI_optimization_goals: Aggressive Speed
  Tag_CPU_unaligned_access: v6
  Tag_ABI_FP_16bit_format: IEEE 754
  Tag_Virtualization_use: TrustZone