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f03d6497cb
There's no point generating debug info if the compiler immediately strips it before we get a chance to do anything with it. This is especially important since Cargo 1.77, which asks rustc to strip by default.
53 lines
1.9 KiB
Bash
53 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 -C strip=none"
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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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