From 6d0c73ab908b6050423b865549b0b1b2502d3b01 Mon Sep 17 00:00:00 2001
From: Piotr Kubaj <pkubaj@FreeBSD.org>
Date: Thu, 7 May 2026 13:10:47 +0000
Subject: [PATCH] gapstate.h: account for a large jmp_buf

Fixes build on powerpc64le platform.
---
 src/gapstate.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/gapstate.h b/src/gapstate.h
index 16d74d2c8a..6dc2191cff 100644
--- a/src/gapstate.h
+++ b/src/gapstate.h
@@ -24,7 +24,11 @@
 #include <setjmp.h>
 
 enum {
-    STATE_SLOTS_SIZE = 32768 - 1024,
+    // On some platforms (e.g., powerpc64), sizeof(jmp_buf) is much larger
+    // than ~200 bytes on x86_64/aarch64. Subtract the excess so that
+    // GAPState stays within the 32767-byte 16-bit signed offset limit.
+    GAP_JMP_BUF_EXTRA = (int)sizeof(jmp_buf) > 200 ? (int)sizeof(jmp_buf) - 200 : 0,
+    STATE_SLOTS_SIZE = 32768 - 1024 - GAP_JMP_BUF_EXTRA,
 };
 
 typedef struct GAPState {