Steps to compile rust hello-world for mips32r1 (uclibc)

cc_hello_mips32.sh

#!/bin/bash

if [ -z "$STAGING_DIR" ]; then
  echo "STAGING_DIR not defined.. exiting"
  exit 1
fi

#FOUND_PATH=`echo $PATH | grep -i uclibc`

if [ -z `echo $PATH | grep -i uclibc` ]; then
  echo "mips32 compiler not in PATH.. exiting"
  exit 1
fi

# 0. export variables
export CC_mips32_unknown_linux_uclibc=mips-openwrt-linux-uclibc-gcc
#export STAGING_DIR=
#export PATH=

rm -rf ~/.xargo/lib/rustlib/mips32-unknown-linux-uclibc

rm -rf hello

# 1. make project
cargo new --bin hello && cd hello

# 2. create toolchain params file
cat >mips32-unknown-linux-uclibc.json <<EOL
{
  "arch": "mips",
  "cpu": "mips32",
  "data-layout": "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64",
  "dynamic-linking": true,
  "env": "uclibc",
  "executables": true,
  "features": "+mips32,+soft-float",
  "has-elf-tls": true,
  "has-rpath": true,
  "is-builtin": true,
  "linker-flavor": "gcc",
  "linker-is-gnu": true,
  "llvm-target": "mips-unknown-linux-uclibc",
  "max-atomic-width": 32,
  "os": "linux",
  "position-independent-executables": true,
  "pre-link-args": {
    "gcc": [
      "-Wl,--as-needed",
      "-Wl,-z,noexecstack"
    ]
  },
  "relro-level": "full",
  "target-c-int-width": "32",
  "target-endian": "big",
  "target-family": "unix",
  "target-pointer-width": "32",
  "vendor": "unknown"
}
EOL

# 3. create Xargo file
cat >Xargo.toml <<EOL
[target.mips32-unknown-linux-uclibc.dependencies.std]
features = []
EOL

# 4. create cargo cc config
mkdir -p .cargo/
cat >.cargo/config <<EOL
[build]
target = "mips32-unknown-linux-uclibc"

[target.mips32-unknown-linux-uclibc]
linker = "mips-openwrt-linux-uclibc-gcc"
ar = "mips-openwrt-linux-uclibc-ar"
EOL

# 5. patch Cargo.toml for panics
cat <<EOT >> Cargo.toml

[profile.dev]
panic = "abort"

[profile.release]
panic = "abort"
EOT

xargo build --target mips32-unknown-linux-uclibc