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#!/bin/bash
# makelib.sh
#
# This is a script to allow combining a list of .a or .o
# files into a single .a file; input .a are decomposed
# into their component .o files. Ordering is maintained.
# It is assumed there are no duplicates. (It's basically the subset
# of libtool that we'd use, if libtool was reliably available everwhere.)
#
# $1 = Output file (always .a)
# $2...$N = Input files (any mixture of .a or .o files)
#
# It is OK to have the same file as an input and output
# (it will of course be overwritten).
if [[ $# -lt 2 ]]; then
echo At least two arguments are required > /dev/stderr
exit 1
fi
if [[ $# -eq 2 && ${1} == ${2} ]]; then
# Output equals input; just return
exit 0
fi
set -euo pipefail
ORIG_WD=${PWD}
# Output to temp file in case it's also in inputs
OUTPUT_DIR=`mktemp -d`
OUTPUT="${OUTPUT_DIR}/tmp.a"
# $1 == destination .a
# $2 == source .o or .a
append_objects() {
# Since we are recursive, we need to do this at each level
set -euo pipefail
local EXT="${2##*.}"
if [[ ${EXT} == "o" ]]; then
ar qS ${1} ${2}
elif [[ ${EXT} == "a" ]]; then
local AR_TEMP=`mktemp -d`
cd ${AR_TEMP}
ar x ${2}
cd ${ORIG_WD}
# Iterate via 'ar t' rather than globbing what we extracted,
# so that we add in the same order.
local OBJ
for OBJ in `ar t ${2}`; do
if [[ "$OBJ" == */* ]]; then
echo "This tool does not support Archive files with partial or absolute paths" > /dev/stderr
exit 1
fi
if [[ ${OBJ} != "__.SYMDEF" && ${OBJ} != "SORTED" ]]; then
$(append_objects ${1} ${AR_TEMP}/${OBJ})
fi
done
rm -rf ${AR_TEMP}
else
echo ${2} is neither .o nor .a > /dev/stderr
exit 1
fi
}
for INPUT_ in ${@:2}; do
# Inputs might be relative; convert to an absolute path
# for ease of use with ar. Since OSX doesn't have a realpath
# available, we'll have to fake it: if the path doesn't begin
# with '/', assume it's relative and prepend PWD.
INPUT=`[[ $INPUT_ = /* ]] && echo "${INPUT_}" || echo "${PWD}/${INPUT_#./}"`
$(append_objects ${OUTPUT} ${INPUT})
done
ranlib ${OUTPUT}
mv -f ${OUTPUT} $1
rm -r ${OUTPUT_DIR}
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