From dc52487d31b11c073838b369de80afa3b0e03575 Mon Sep 17 00:00:00 2001
From: ISSOtm <me@eldred.fr>
Date: Tue, 14 Apr 2026 02:30:40 +0200
Subject: [PATCH] Make `-Wformat` non-fatal on MinGW

See the comment for a rationale.
---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62702d3f..c46928da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -163,6 +163,14 @@ else()
                         -Wno-type-limits -Wno-tautological-constant-out-of-range-compare
                         -Wvla) # MSVC does not support VLAs
   endif()
+
+  if(MINGW)
+    # MinGW warns about format specifiers like `%z` and `%j`, which are missing on Windows XP and earlier.
+    # We rely on runtimes more modern than that, so we can ignore those warnings.
+    # If this is a problem for you: use Microsoft's equivalents, or define `__USE_MINGW_ANSI_STDIO=1`.
+    # https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/
+    add_compile_options(-Wno-error=format -Wno-error=format-extra-args)
+  endif()
 endif()
 
 add_subdirectory(src)