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-rw-r--r--third_party/nix/src/libstore/local-store.cc8
1 files changed, 8 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/local-store.cc b/third_party/nix/src/libstore/local-store.cc
index e7746973f956..995bc4f998b4 100644
--- a/third_party/nix/src/libstore/local-store.cc
+++ b/third_party/nix/src/libstore/local-store.cc
@@ -490,10 +490,18 @@ static void canonicalisePathMetaData_(const Path& path, uid_t fromUid,
     if (inodesSeen.find(Inode(st.st_dev, st.st_ino)) == inodesSeen.end()) {
       throw BuildError(format("invalid ownership on file '%1%'") % path);
     }
+
+// `mode` variable is only used in debug builds
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-variable"
+
     mode_t mode = st.st_mode & ~S_IFMT;
     assert(S_ISLNK(st.st_mode) ||
            (st.st_uid == geteuid() && (mode == 0444 || mode == 0555) &&
             st.st_mtime == mtimeStore));
+
+#pragma clang diagnostic pop
+
     return;
   }