Thanks to Michal Sojka <sojkam1@fel.cvut.cz> for pointing out the
correct fix, which I verified in the freely-available WG14/N1124 draft
(from the C99 working group) which is available here:
http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1124.pdf
#ifndef NOTMUCH_DATABASE_PRIVATE_H
#define NOTMUCH_DATABASE_PRIVATE_H
+/* According to WG14/N1124, a C++ implementation won't provide us a
+ * macro like PRIx64 (which gives a printf format string for
+ * formatting a uint64_t as hexadecimal) unless we define
+ * __STDC_FORMAT_MACROS before including inttypes.h. That's annoying,
+ * but there it is.
+ */
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
#include "notmuch-private.h"
#include <xapian.h>
notmuch->last_thread_id++;
- sprintf (thread_id, "%016llx", notmuch->last_thread_id);
+ sprintf (thread_id, "%016" PRIx64, notmuch->last_thread_id);
db->set_metadata ("last_thread_id", thread_id);