preprocessor: add #ifndef...#endif include guard optimization

1 files changed, 2 insertions, 2 deletions

diff --git a/common.h b/common.h
index a1f1d21..20716d2 100644
--- a/common.h
+++ b/common.h
@@ -382,8 +382,8 @@ const char *getfilename(int id);
 struct memfile *getfile(int id);
 void addfileline(int id, uint off);
 void getfilepos(int *line, int *col, int id, uint off);
-bool isoncefile(int id);
-void markfileonce(int id);
+bool isoncefile(int id, const char **guard);
+void markfileonce(int id, const char *guard);
 void markfileseen(int id);
 bool isfileseen(int id);
 void closefile(int id);