Allow gcc to emit warnings for unsafe usage of setjmp/longjmp

Patch to allow gcc to emit warnings for unsafe usage of setjmp/long

Signed-off-by: David Decotigny <gdaviddecotigny@users.sf.net>
Signed-off-by: Nigel Croxon <noxorc@mac.com>

inc/efisetjmp.h

@@ -1,9 +1,10 @@
 #ifndef GNU_EFI_SETJMP_H
 #define GNU_EFI_SETJMP_H
 
+#include "eficompiler.h"
 #include "efisetjmp_arch.h"
 
-extern UINTN setjmp(jmp_buf *env);
-extern VOID longjmp(jmp_buf *env, UINTN value);
+extern UINTN setjmp(jmp_buf *env) __attribute__((returns_twice));
+extern VOID longjmp(jmp_buf *env, UINTN value) __attribute__((noreturn));
 
 #endif /* GNU_EFI_SETJMP_H */