Fat / Universal Compilation for macOS x86_64 + ARM64

tool.fatgcc.sh

function fat() {
  local output="${1}"
  local files=($(printf "%s\n" "${2}"))
  local GCC_ARGS=(${3:-$(printf "%s\n" "-std=c99 -Wall")})

  if [ ${#} -eq 0 ]; then
    local argfiles='"<\x1b[93mfile1\x1b[39m> <\x1b[93mfileN\x1b[39m>"'
    local argopts='"<\x1b[93mgcc-opt1\x1b[39m> <\x1b[93mgcc-optN\x1b[39m>"'
    local argout="<\x1b[93moutput-file\x1b[39m>"

    printf "Usage: \x1b[36mfat\x1b[39m ${argout} ${argfiles} ${argopts}\n"
    printf "where\n"
    printf "  \x1b[1moutput-file\x1b[22m  the name of the output binary\n"
    printf "  \x1b[1mfile1-N\x1b[22m      space separated quoted list of files\n"
    printf "  \x1b[1mgcc-opt-1-N\x1b[22m  space separated quoted GCC arg list\n"
    printf "\n"
    printf "GCC options default to \"\x1b[1m-std=c99 -Wall\x1b[22m\"\n"
    return 0
  fi

  for f in ${files[@]}; do
    if [ ! -f "${f}" ]; then
      printf "File ${f} not present on disk\n"
      return 1
    fi
  done

  gcc ${GCC_ARGS[@]} -arch x86_64 -o "${output}-x86_64" ${files[@]} && \
  gcc ${GCC_ARGS[@]} -arch arm64 -o "${output}-arm64" ${files[@]} && \
  lipo -create -output "${output}" "${output}-x86_64" "${output}-arm64" && \
  rm "${output}-arm64" "${output}-x86_64"

  if [ -f "${output}" ]; then
    printf "\n\x1b[32mSuccessfully\x1b[39m compiled \x1b[1m${output}\x1b[22m.\n"
    file "${output}"
    return 0
  else
    printf "\nAn \x1b[31merror\x1b[39m occurred!\n"
    return 1
  fi
}

A function that given the files tool.c and tool_helper.c could be universally/fat compiled using

fat tool "tool.c tool_helper.c"

By default, -std=c99 and -Wall are the default options but c11 for example could be used by supplying it as the only option at the end, such as

fat tool "tool.c tool_helper.c" -std=c11