From 08ac44ba73d425a967e45ef31610633cfe2e68ec Mon Sep 17 00:00:00 2001
From: Jonathan Kew <jkew@mozilla.com>
Date: Wed, 22 Apr 2026 13:00:22 -0700
Subject: [PATCH 03/29] Avoid 'register' keyword for C++ compatibility

---
 src/cairoint.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/cairoint.h b/src/cairoint.h
index be1a4ba2a..0bb8b6f61 100644
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -177,8 +177,12 @@ _cairo_popcount (uint32_t mask)
 {
 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
     return __builtin_popcount (mask);
+#else
+#ifdef __cplusplus
+    int y;
 #else
     register int y;
+#endif
 
     y = (mask >> 1) &033333333333;
     y = mask - y - ((y >>1) & 033333333333);
-- 
2.53.0