https://git.ruby-lang.org/ruby.git/commit/?id=217f7cb16f

From 217f7cb16fe466b8be3cdb969655b4512d5e95fa Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Tue, 14 Sep 2021 10:31:34 +0200
Subject: Include errno message in mmap failure output

It might help figure out why it is failing.
---
 yjit_asm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/yjit_asm.c b/yjit_asm.c
index 31e1528ff0..4a296e314c 100644
--- a/yjit_asm.c
+++ b/yjit_asm.c
@@ -7,6 +7,7 @@ https://github.com/ruby/ruby/blob/trunk/yjit_asm.c#L7
 #include <stdarg.h>
 #include <stdint.h>
 #include <assert.h>
+#include <errno.h>
 
 // For mmapp(), sysconf()
 #ifndef _WIN32
@@ -203,7 +204,7 @@ uint8_t* alloc_exec_mem(uint32_t mem_size) https://github.com/ruby/ruby/blob/trunk/yjit_asm.c#L204
 
     // Check that the memory mapping was successful
     if (mem_block == MAP_FAILED) {
-        fprintf(stderr, "mmap call failed\n");
+        perror("mmap call failed");
         exit(-1);
     }
 
-- 
cgit v1.2.1


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