linux-kernel - [PATCH 4.9 03/11] usbip: tools: fix build error for multiple definition

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Message-Id: <20210310132320.498616113@linuxfoundation.org>
Date:   Wed, 10 Mar 2021 14:25:02 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Antonio Borneo <borneo.antonio@...il.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Petr Štetiar <ynezz@...e.cz>
Subject: [PATCH 4.9 03/11] usbip: tools: fix build error for multiple definition

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Antonio Borneo <borneo.antonio@...il.com>

commit d5efc2e6b98fe661dbd8dd0d5d5bfb961728e57a upstream.

With GCC 10, building usbip triggers error for multiple definition
of 'udev_context', in:
- libsrc/vhci_driver.c:18 and
- libsrc/usbip_host_common.c:27.

Declare as extern the definition in libsrc/usbip_host_common.c.

Signed-off-by: Antonio Borneo <borneo.antonio@...il.com>
Acked-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/20200618000844.1048309-1-borneo.antonio@gmail.com
Cc: Petr Štetiar <ynezz@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/usb/usbip/libsrc/usbip_host_common.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/usb/usbip/libsrc/usbip_host_common.c
+++ b/tools/usb/usbip/libsrc/usbip_host_common.c
@@ -35,7 +35,7 @@
 #include "list.h"
 #include "sysfs_utils.h"
 
-struct udev *udev_context;
+extern struct udev *udev_context;
 
 static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)
 {