From d057b9309aec3a5a53aaee1ac3451a8a5b71b4e8 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sat, 14 May 2022 18:22:26 +0100
Subject: [PATCH] hping: fix build against gcc-10 (-fno-common)

gcc-10 changed the default from -fcommon to fno-common:
  https://gcc.gnu.org/PR85678

As a result build fails as:

    ld: scan.o:/build/hping/hping2.h:360: multiple definition of `delaytable'; main.o:/build/hping/hping2.h:360: first defined here

The change moves variable definitions to .c file.
---
 hping2.h | 2 +-
 main.c   | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/hping2.h b/hping2.h
index 27cb0ff..60d4370 100644
--- a/hping2.h
+++ b/hping2.h
@@ -357,7 +357,7 @@ struct delaytable_element {
 	int status;
 };
 
-volatile struct delaytable_element delaytable[TABLESIZE];
+extern volatile struct delaytable_element delaytable[TABLESIZE];
 
 /* protos */
 void	nop(void);				/* nop */
diff --git a/main.c b/main.c
index 3aedd86..f7bace6 100644
--- a/main.c
+++ b/main.c
@@ -30,6 +30,8 @@
 
 #include "hping2.h"
 
+volatile struct delaytable_element delaytable[TABLESIZE];
+
 /* globals */
 unsigned int
 	tcp_th_flags = 0,