make_fat_objc_library.sh

#!/bin/sh

function main {
  for cpu in ${CPUS[@]}
  do
    echo ==== $cpu ====
    check bazel build --ios_cpu=$cpu $DEPS
    check mkdir -p $WORK/$cpu
    for dep in $DEPS
    do
      check cp_dep_library $cpu $dep
    done
    check gen_packed_library $cpu
  done
  check gen_lipo_library
  printf $'Done:\n  %s\n' $LIB
}

function cp_dep_library {
  cpu=$1
  dep=$2
  lib=$(target_to_lib $dep)
  cp $lib $WORK/$cpu
}

function gen_packed_library {
  cpu=$1
  check pushdq $WORK/$cpu
  for lib in *.a
  do
    check mkdir ${lib}_obj
    check pushdq ${lib}_obj
    check ar -x ../$lib
    check ar -qc ../../lib$cpu.a *.o
    check popdq
  done
  check popdq
}

function gen_lipo_library {
  check lipo -create -output $LIB $WORK/*.a
}

function target_to_dir {
  target=$1
  echo $target | sed -e 's=^//\(.*\):.*$=\1='
}

function target_to_file {
  target=$1
  echo $target | sed -e 's=^.*:\(.*\)$=\1='
}

function target_to_lib {
  target=$1
  dir=$(target_to_dir $target)
  file=$(target_to_file $target)
  echo bazel-bin/$dir/lib$file.a
}

function target_to_src {
  target=$1
  echo $(target_to_dir $target)/$(target_to_file $target)
}

function check {
  $@ || {
    echo "FAILED: $@" 1>&2
    exit 1
  }
}

function pushdq { pushd $@ >/dev/null ;}
function popdq { popd $@ >/dev/null ;}

TARG=$1
shift
CPUS=$@

[ -z "$TARG" ] && exit 1
[ -z "$CPUS" ] && exit 1

DEPS=$(bazel query "kind(.*_library, deps($TARG)) - //tools/cpp:stl")
LIB=$(target_to_lib $TARG)

WORK=$(mktemp -dt $(basename $0))
trap "rm -rf $WORK" EXIT

time main