https://git.ruby-lang.org/ruby.git/commit/?id=f71659d47b

From f71659d47bacdaeb57689de7274413e64937637c Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 4 Feb 2021 17:47:12 +0900
Subject: Revert "vm_dump.c: Do not show C backtrace on riscv"

This reverts commit 6985bfb72c8d7e7d94f1aad1f0902b602bbfa6da.

Now it should work on riscv by the previous commit. [Bug #17609]
---
 vm_dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vm_dump.c b/vm_dump.c
index ae3cbb4..279164c 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -756,7 +756,7 @@ rb_print_backtrace(void) https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L756
 #define MAX_NATIVE_TRACE 1024
     static void *trace[MAX_NATIVE_TRACE];
     int n = (int)backtrace(trace, MAX_NATIVE_TRACE);
-#if (defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H)) && defined(HAVE_DLADDR) && !defined(__sparc) && !defined(__riscv)
+#if (defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H)) && defined(HAVE_DLADDR) && !defined(__sparc)
     rb_dump_backtrace_with_lines(n, trace);
 #else
     char **syms = backtrace_symbols(trace, n);
-- 
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