From ec5b66eb4add9d494d8fb16f6899028750d317a2 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 17 Sep 2015 15:24:32 +0200 Subject: 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. --- .../setup-hooks/separate-debug-info.sh | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 pkgs/build-support/setup-hooks/separate-debug-info.sh (limited to 'pkgs/build-support/setup-hooks/separate-debug-info.sh') diff --git a/pkgs/build-support/setup-hooks/separate-debug-info.sh b/pkgs/build-support/setup-hooks/separate-debug-info.sh new file mode 100644 index 0000000000000..6369189920906 --- /dev/null +++ b/pkgs/build-support/setup-hooks/separate-debug-info.sh @@ -0,0 +1,37 @@ +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 +} -- cgit 1.4.1