From: Vincent Bernat <vincent@bernat.ch>
Date: Mon, 28 Sep 2020 14:30:56 +0000 (+0200)
Subject: Unix: fix compilation with GCC 10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4f91ee4cb11a10df6a61ab4ffcdc8e2da3c3483;p=thirdparty%2Fbird.git

Unix: fix compilation with GCC 10

GCC 10 will now error when declaring a global variable twice:

  https://gcc.gnu.org/gcc-10/porting_to.html#common

Fix this issue by declaring the variable as `extern' in `krt.h'.
The variable is really declared in `krt.c'.
---

diff --git a/sysdep/unix/krt.h b/sysdep/unix/krt.h
index d4a8717e3..fe79efc37 100644
--- a/sysdep/unix/krt.h
+++ b/sysdep/unix/krt.h
@@ -112,7 +112,7 @@ struct kif_proto {
   struct kif_state sys;		/* Sysdep state */
 };
 
-struct kif_proto *kif_proto;
+extern struct kif_proto *kif_proto;
 
 #define KIF_CF ((struct kif_config *)p->p.cf)