https://git.ruby-lang.org/ruby.git/commit/?id=a132d69757

From a132d69757486d080b94d7f2e416de6396e7f894 Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Mon, 5 Oct 2020 13:34:22 -0400
Subject: Get access to MAP_ANONYMOUS in pedantic compile mode

---
 ujit_asm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ujit_asm.c b/ujit_asm.c
index 1ff1c537b7..fda657757b 100644
--- a/ujit_asm.c
+++ b/ujit_asm.c
@@ -4,6 +4,8 @@ https://github.com/ruby/ruby/blob/trunk/ujit_asm.c#L4
 #include <assert.h>
 
 #ifndef _WIN32
+// For MAP_ANONYMOUS on GNU/Linux
+#define _GNU_SOURCE
 // For mmapp()
 #include <sys/mman.h>
 #endif
-- 
cgit v1.2.1


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