1 files changed, 1 insertions, 0 deletions
diff --git a/libtcc.h b/libtcc.h
index db77000..6cacd73 100644
--- a/libtcc.h
+++ b/libtcc.h
@@ -60,6 +60,7 @@ int tcc_compile_string(TCCState *s, const char *buf);
 #define TCC_OUTPUT_EXE      1 /* executable file */
 #define TCC_OUTPUT_DLL      2 /* dynamic library */
 #define TCC_OUTPUT_OBJ      3 /* object file */
+#define TCC_OUTPUT_PREPROCESS 4 /* preprocessed file (used internally) */
 int tcc_set_output_type(TCCState *s, int output_type);
 
 #define TCC_OUTPUT_FORMAT_ELF    0 /* default output format: ELF */