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https://bugs.gentoo.org/815130
https://github.com/ffi/ffi/commit/315d66e7b0768856d589e15bf597f4816d5cd524
From 0ef7a9d7d22c9a7779def3f8c7f0166d996a2401 Mon Sep 17 00:00:00 2001
From: xtkoba <69125751+xtkoba@users.noreply.github.com>
Date: Wed, 29 Sep 2021 19:24:44 +0900
Subject: [PATCH] Keep `LONGDOUBLE_ADJ >= sizeof(long double)`
--- a/ext/ffi_c/Call.c
+++ b/ext/ffi_c/Call.c
@@ -71,7 +71,7 @@
#define FLOAT32_ADJ (4)
#define FLOAT64_ADJ (8)
#define ADDRESS_ADJ (sizeof(void *))
-#define LONGDOUBLE_ADJ (ffi_type_longdouble.alignment)
+#define LONGDOUBLE_ADJ (ffi_type_longdouble.alignment > sizeof(long double) ? ffi_type_longdouble.alignment : sizeof(long double))
#endif /* USE_RAW */
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