implement most of preprocessor

  - concatenation (##)
  - builtin macros (__FILE__ etc)
  - fails in some edge cases, and code needs cleanup
  - add embedded system include files (stddef.h, stdarg.h for now)
  - can handle stdio.h now

1 files changed, 1 insertions, 1 deletions

diff --git a/test/pp.h b/test/pp.h
index 029c6ee..63de6f5 100644
--- a/test/pp.h
+++ b/test/pp.h
@@ -17,7 +17,7 @@ void hi(int x) {
 #define STR(h) #h 
 
 #define xstr(s1) str(s1)
-#define str(s) #s
+#define str(...) #__VA_ARGS__
 
 #endif