nixpkgs/pkgs/build-support/setup-hooks/separate-debug-info.sh
Eelco Dolstra ec5b66eb4a Enable separate debug info
You can now pass

  separateDebugInfo = true;

to mkDerivation. This causes debug info to be separated from ELF
binaries and stored in the "debug" output. The advantage is that it
enables installing lean binaries, while still having the ability to
make sense of core dumps, etc.
2015-09-17 15:56:33 +02:00

38 lines
1.1 KiB
Bash

export NIX_LDFLAGS+=" --build-id"
export NIX_CFLAGS_COMPILE+=" -ggdb"
dontStrip=1
fixupOutputHooks+=(_separateDebugInfo)
_separateDebugInfo() {
local dst="${debug:-$out}"
if [ "$prefix" = "$dst" ]; then return; fi
dst="$dst/lib/debug/.build-id"
# Find executables and dynamic libraries.
local -a files=($(find "$prefix" -type f -a \( -perm /0100 -o -name "*.so" -o -name "*.so.*" \)))
local i magic
for i in "${files[@]}"; do
# Skip non-ELF files.
exec 10< "$i"
read -n 4 -u 10 magic
if [[ "$magic" =~ ELF ]]; then echo FOO; fi
exec 10<&-
# Extract the Build ID. FIXME: there's probably a cleaner way.
local id="$(readelf -n "$i" | sed 's/.*Build ID: \([0-9a-f]*\).*/\1/; t; d')"
if [ "${#id}" != 40 ]; then
echo "could not find build ID of $i, skipping" >&2
continue
fi
# Extract the debug info.
header "separating debug info from $i (build ID $id)"
mkdir -p "$dst/${id:0:2}"
objcopy --only-keep-debug "$i" "$dst/${id:0:2}/${id:2}.debug"
strip --strip-debug "$i"
done
}