From 0e50bfaefde2a01792f4e4bcad7e0d822c74835b Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 25 Dec 2017 19:42:42 +0900
Subject: [PATCH] meson: define _GNU_SOURCE to detect copy_file_range() (#7734)

Follow-up for bad7a0c81f501fbbcc79af9eaa4b8254441c4a1f of git
repository for glibc.

Recently glibc added `copy_file_range()`, but to use it,
`_GNU_SOURCE` needs to be defined. This adds the flag in
meson.build to detect the function by meson correctly.
---
 meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index be8e610452c..f3a65b38932 100644
--- a/meson.build
+++ b/meson.build
@@ -468,7 +468,8 @@ foreach ident : [
         ['kcmp',              '''#include <linux/kcmp.h>'''],
         ['keyctl',            '''#include <sys/types.h>
                                  #include <keyutils.h>'''],
-        ['copy_file_range',   '''#include <sys/syscall.h>
+        ['copy_file_range',   '''#define _GNU_SOURCE
+                                 #include <sys/syscall.h>
                                  #include <unistd.h>'''],
         ['bpf',               '''#include <sys/syscall.h>
                                  #include <unistd.h>'''],