52 lines
1.9 KiB
Bash
52 lines
1.9 KiB
Bash
export NIX_SET_BUILD_ID=1
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export NIX_LDFLAGS+=" --compress-debug-sections=zlib"
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export NIX_CFLAGS_COMPILE+=" -ggdb -Wa,--compress-debug-sections"
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export NIX_RUSTFLAGS+=" -g"
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fixupOutputHooks+=(_separateDebugInfo)
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_separateDebugInfo() {
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[ -e "$prefix" ] || return 0
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local dst="${debug:-$out}"
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if [ "$prefix" = "$dst" ]; then return 0; fi
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# in case there is nothing to strip, don't fail the build
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mkdir -p "$dst"
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dst="$dst/lib/debug/.build-id"
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# Find executables and dynamic libraries.
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local i
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while IFS= read -r -d $'\0' i; do
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if ! isELF "$i"; then continue; fi
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[ -z "${READELF:-}" ] && echo "_separateDebugInfo: '\$READELF' variable is empty, skipping." 1>&2 && break
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[ -z "${OBJCOPY:-}" ] && echo "_separateDebugInfo: '\$OBJCOPY' variable is empty, skipping." 1>&2 && break
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# Extract the Build ID. FIXME: there's probably a cleaner way.
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local id="$($READELF -n "$i" | sed 's/.*Build ID: \([0-9a-f]*\).*/\1/; t; d')"
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if [ "${#id}" != 40 ]; then
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echo "could not find build ID of $i, skipping" >&2
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continue
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fi
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# Extract the debug info.
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echo "separating debug info from $i (build ID $id)"
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mkdir -p "$dst/${id:0:2}"
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# This may fail, e.g. if the binary is for a different
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# architecture than we're building for. (This happens with
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# firmware blobs in QEMU.)
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(
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if [ -f "$dst/${id:0:2}/${id:2}.debug" ]
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then
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echo "separate-debug-info: warning: multiple files with build id $id found, overwriting"
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fi
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$OBJCOPY --only-keep-debug "$i" "$dst/${id:0:2}/${id:2}.debug"
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# Also a create a symlink <original-name>.debug.
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ln -sfn ".build-id/${id:0:2}/${id:2}.debug" "$dst/../$(basename "$i")"
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) || rmdir -p "$dst/${id:0:2}"
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done < <(find "$prefix" -type f -print0 | sort -z)
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}
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