1 files changed, 37 insertions, 0 deletions
diff --git a/infra/libkookie/nixpkgs/pkgs/build-support/setup-hooks/separate-debug-info.sh b/infra/libkookie/nixpkgs/pkgs/build-support/setup-hooks/separate-debug-info.sh
new file mode 100644
index 000000000000..19dbb10d18e7
--- /dev/null
+++ b/infra/libkookie/nixpkgs/pkgs/build-support/setup-hooks/separate-debug-info.sh
@@ -0,0 +1,37 @@
+export NIX_SET_BUILD_ID=1
+export NIX_LDFLAGS+=" --compress-debug-sections=zlib"
+export NIX_CFLAGS_COMPILE+=" -ggdb -Wa,--compress-debug-sections"
+dontStrip=1
+
+fixupOutputHooks+=(_separateDebugInfo)
+
+_separateDebugInfo() {
+    [ -e "$prefix" ] || return 0
+
+    local dst="${debug:-$out}"
+    if [ "$prefix" = "$dst" ]; then return 0; fi
+
+    dst="$dst/lib/debug/.build-id"
+
+    # Find executables and dynamic libraries.
+    local i magic
+    while IFS= read -r -d $'\0' i; do
+        if ! isELF "$i"; then continue; fi
+
+        # 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"
+
+        # Also a create a symlink <original-name>.debug.
+        ln -sfn ".build-id/${id:0:2}/${id:2}.debug" "$dst/../$(basename "$i")"
+    done < <(find "$prefix" -type f -print0)
+}