From 1970abfeb9771157454510bafcda1a94184826e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Sat, 6 Sep 2025 21:49:31 +0200
Subject: [PATCH] daemon: Avoid comparison of integers of different signs.
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Fixes guix/guix#1173.

* nix/libstore/gc.cc (LocalStore::removeUnusedLinks): Cast ‘st_size’ as
unsigned.

Reported-by: Congcong Kuo <congcong.kuo@gmail.com>
Change-Id: Ibe4674bcef186befe8a0e536278c87458b098c9d
---
 nix/libstore/gc.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nix/libstore/gc.cc b/nix/libstore/gc.cc
index 08638b51153..77a2a7027db 100644
--- a/nix/libstore/gc.cc
+++ b/nix/libstore/gc.cc
@@ -608,7 +608,8 @@ void LocalStore::removeUnusedLinks(const GCState & state)
 
 	/* Drop links for files smaller than 'deduplicationMinSize', even if
 	   they have more than one hard link.  */
-        if (st.st_nlink != 1 && st.st_size >= deduplicationMinSize) {
+        if (st.st_nlink != 1
+	    && ((unsigned long long) st.st_size) >= deduplicationMinSize) {
             actualSize += st.st_size;
             unsharedSize += (st.st_nlink - 1) * st.st_size;
             continue;