Merge branch 'master' into staging

1 files changed, 37 insertions, 0 deletions

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 000000000000..636918992090
--- /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
+}