With VT=n, the kernel build fails with:
drivers/built-in.o: In function `kgdboc_pre_exp_handler':
kgdboc.c:(.text+0x7b5aa): undefined reference to `fg_console'
kgdboc.c:(.text+0x7b5ce): undefined reference to `vc_cons'
kgdboc.c:(.text+0x7b5d5): undefined reference to `vc_cons'

kgdboc.o is built when KGDB_SERIAL_CONSOLE is set. So make
KGDB_SERIAL_CONSOLE depend on HW_CONSOLE which includes those symbols.

Signed-off-by: Jiri Slaby <jsl...@suse.cz>
Reported-by: "Jim Davis" <jim.ep...@gmail.com>
Cc: Jason Wessel <jason.wes...@windriver.com>
Cc: <kgdb-bugrep...@lists.sourceforge.net>
Cc: <linux-ser...@vger.kernel.org>
---
 lib/Kconfig.kgdb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index c635a107a7de..533f912638ed 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -22,7 +22,7 @@ config KGDB_SERIAL_CONSOLE
        tristate "KGDB: use kgdb over the serial console"
        select CONSOLE_POLL
        select MAGIC_SYSRQ
-       depends on TTY
+       depends on TTY && HW_CONSOLE
        default y
        help
          Share a serial console with kgdb. Sysrq-g must be used
-- 
2.7.4

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