windows: Add _stack_chk_guard/_stack_chk_fail symbols for Windows 64-bit target

Otherwise the GRUB cannot start due to missing symbols when stack
protector is enabled on EFI platforms.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>

diff --git a/include/grub/stack_protector.h b/include/grub/stack_protector.h
index c88dc00b5f970882c71f2e0436ab156d48c799d5..13d2657d98f50175e3ee268d802b546a909d93fc 100644 (file)
--- a/include/grub/stack_protector.h
+++ b/include/grub/stack_protector.h
@@ -25,6 +25,10 @@
 #ifdef GRUB_STACK_PROTECTOR
 extern grub_addr_t EXPORT_VAR (__stack_chk_guard);
 extern void __attribute__ ((noreturn)) EXPORT_FUNC (__stack_chk_fail) (void);
+#if defined(_WIN64) && !defined(__CYGWIN__) /* MinGW, Windows 64-bit target. */
+static grub_addr_t __attribute__ ((weakref("__stack_chk_guard"))) EXPORT_VAR (_stack_chk_guard);
+static void __attribute__ ((noreturn, weakref("__stack_chk_fail"))) EXPORT_FUNC (_stack_chk_fail) (void);
+#endif
 #endif
 
 #endif /* GRUB_STACK_PROTECTOR_H */