Description: Avoid overloading on 32 bit architectures
 unsigned and size_t are equivalent on 32 bit architectures,
 so only define the size_t based overload of advance on 64
 bit architectures.
 https://wiki.debian.org/ArchitectureSpecificsMemo
Author: James Page <james.page@ubuntu.com>, Bernd Zeimetz <bzed@debian.org>
Forwarded: no

--- a/src/include/buffer.h
+++ b/src/include/buffer.h
@@ -737,7 +737,12 @@ inline namespace v14_2_0 {
 
       void advance(int o) = delete;
       void advance(unsigned o);
+
+// unsigned and size_t are equivalent on 32bit architectures.
+// so casting is only needed when not on 32bit.
+#if defined(UINTPTR_MAX) && UINTPTR_MAX > 0xffffffff
       void advance(size_t o) { advance(static_cast<unsigned>(o)); }
+#endif
       void seek(unsigned o);
       char operator*() const;
       iterator_impl& operator++();