kconfig: ensure strndup() declaration is visible

Its guard was updated such that it is visible by default when POSIX 2008
was adopted by glibc. It's not visible by default on older glibc.

Fixes: f80fe2b34f08 ("xen: Update Kconfig to Linux v5.4")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Doug Goldstein <cardoe@cardoe.com>

diff --git a/xen/tools/kconfig/parser.y b/xen/tools/kconfig/parser.y
index 60936c76865bfb07e6fb1f2767bc1514e69a6169..822fc89fc8031ffb5a906868720d8f5a80eb5d20 100644 (file)
--- a/xen/tools/kconfig/parser.y
+++ b/xen/tools/kconfig/parser.y
@@ -4,6 +4,7 @@
  */
 %{
 
+#define _GNU_SOURCE
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>