test9: Declare _main_stack_top as external symbol

Fixes:

  arm-none-eabi/bin/ld: test9.o:/Users/philmd/source/m-profile-tests/test9.c:6: multiple definition of `_main_stack_top'; init-m-test9.o:(.bss+0x400): first defined here

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/test9.c b/test9.c
index b96fbde..d3d8b09 100644
--- a/test9.c
+++ b/test9.c
@@ -3,7 +3,7 @@
 #include "armv7m.h"
 #include "testme.h"
 
-char _main_stack_top;
+extern char _main_stack_top;
 
 /* defintion must match test-m-test9.S */
 struct early_state_t {