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#!/bin/bash
#
# Generate MiniDebugInfo data (in the '.gnu_debugdata' section)
#
set -e
# Check we have the required arguments
if [[ $# -ne 2 ]]; then
cat >2 <<EOF
usage: make-minidebug <input> <output>
Extract debug information from <input> and generate a new version, <output>,
containing a compressed '.gnu_debugdata' section.
Requires xz be installed on your machine.
EOF
exit 1
fi
# Grab the arguments
input=$1
output=$2
# Check for the tools we need
for tool in nm comm objcopy xz strip; do
if ! $(which $tool >/dev/null); then
echo "make-minidebug: $tool not installed."
exit 1
fi
done
# Create a temporary directory to work in
tempdir=$(mktemp -d -t tmp.XXXXXXXXXXX)
function cleanup {
rm -rf "$tempdir"
}
trap cleanup EXIT
# Actually construct the MiniDebug section
nm -D "$input" --format=posix --defined-only \
| awk '{ print $1 }' | sort > "$tempdir/dynsyms"
nm "$input" --format=posix --defined-only \
| awk '$2 ~ /[TtD]/ { print $1 }' \
| sort > "$tempdir/funcsyms"
comm -13 "$tempdir/dynsyms" "$tempdir/funcsyms" > "$tempdir/keepsyms"
objcopy --only-keep-debug \
--remove-section .gdb_index \
--remove-section .comment \
--keep-symbols="$tempdir/keepsyms" \
"$input" "$tempdir/minidbginfo"
xz "$tempdir/minidbginfo"
objcopy -S --remove-section .comment \
--add-section .gnu_debugdata="$tempdir/minidbginfo.xz" \
"$input" "$output"
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