From 353cba49558d56b10ed549a628ee54cd8875b8f5 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Thu, 25 Apr 2024 10:45:26 -0400
Subject: [PATCH] Use fprintf for error message when loading external GC

The error message is often long, so using a small buffer could cause it
to be truncated. rb_bug also has a 256 byte message buffer, so it could
also be truncated.
---
 gc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gc.c b/gc.c
index 5784ce4994..564b765e60 100644
--- a/gc.c
+++ b/gc.c
@@ -1893,10 +1893,11 @@ ruby_external_gc_init()
     char *gc_so_path = getenv("RUBY_GC_LIBRARY_PATH");
     void *handle = NULL;
     if (gc_so_path) {
-        char error[128];
+        char error[1024];
         handle = dln_open(gc_so_path, error, sizeof(error));
         if (!handle) {
-            rb_bug("ruby_external_gc_init: Shared library %s cannot be opened (%s)", gc_so_path, error);
+            fprintf(stderr, "%s", error);
+            rb_bug("ruby_external_gc_init: Shared library %s cannot be opened", gc_so_path);
         }
     }