meson: define _GNU_SOURCE to detect copy_file_range()

Follow-up for bad7a0c81f501fbbcc79af9eaa4b8254441c4a1f of git repository for glibc.
systemd · Dec 24, 2017 · 5b653a7 · 5b653a7
1 parent ebe6ff6
commit 5b653a7
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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>'''],