From 5a2358cccf871464098802fc920c37bf983582a8 Mon Sep 17 00:00:00 2001
From: pecora <pecora@posteo.de>
Date: Tue, 27 May 2025 23:06:31 +0200
Subject: [PATCH] added attribute to arena_sprintf to get compiler warnings for
 wrongly matched format strings

---
 arena.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arena.h b/arena.h
index 7ec4c8f..d038e9b 100644
--- a/arena.h
+++ b/arena.h
@@ -376,7 +376,13 @@ char *arena_vsprintf(Arena *a, const char *format, va_list args)
     return result;
 }
 
-char *arena_sprintf(Arena *a, const char *format, ...)
+#if defined(__GNUC__) || defined(__clang__)
+#define CHECK_PRINTF_FMT(a, b) __attribute__ ((format (printf, a, b)))
+#else
+#define CHECK_PRINTF_FMT(...)
+#endif
+
+CHECK_PRINTF_FMT(2, 3) char *arena_sprintf(Arena *a, const char *format, ...)
 {
     va_list args;
     va_start(args, format);