tjh.dev
Clone of https://github.com/NixOS/nixpkgs.git (to stress-test knotserver)
1export NIX_SET_BUILD_ID=1
2export NIX_LDFLAGS+=" --compress-debug-sections=zlib"
3export NIX_CFLAGS_COMPILE+=" -ggdb -Wa,--compress-debug-sections"
4export RUSTFLAGS+=" -g"
5
6fixupOutputHooks+=(_separateDebugInfo)
7
8_separateDebugInfo() {
9 [ -e "$prefix" ] || return 0
10
11 local dst="${debug:-$out}"
12 if [ "$prefix" = "$dst" ]; then return 0; fi
13
14 # in case there is nothing to strip, don't fail the build
15 mkdir -p "$dst"
16
17 dst="$dst/lib/debug/.build-id"
18
19 # Find executables and dynamic libraries.
20 local i
21 while IFS= read -r -d $'\0' i; do
22 if ! isELF "$i"; then continue; fi
23
24 # Extract the Build ID. FIXME: there's probably a cleaner way.
25 local id="$($READELF -n "$i" | sed 's/.*Build ID: \([0-9a-f]*\).*/\1/; t; d')"
26 if [ "${#id}" != 40 ]; then
27 echo "could not find build ID of $i, skipping" >&2
28 continue
29 fi
30
31 # Extract the debug info.
32 echo "separating debug info from $i (build ID $id)"
33 mkdir -p "$dst/${id:0:2}"
34
35 # This may fail, e.g. if the binary is for a different
36 # architecture than we're building for. (This happens with
37 # firmware blobs in QEMU.)
38 (
39 if [ -f "$dst/${id:0:2}/${id:2}.debug" ]
40 then
41 echo "separate-debug-info: warning: multiple files with build id $id found, overwriting"
42 fi
43 $OBJCOPY --only-keep-debug "$i" "$dst/${id:0:2}/${id:2}.debug"
44
45 # Also a create a symlink <original-name>.debug.
46 ln -sfn ".build-id/${id:0:2}/${id:2}.debug" "$dst/../$(basename "$i")"
47 ) || rmdir -p "$dst/${id:0:2}"
48 done < <(find "$prefix" -type f -print0 | sort -z)
49}