gorny
2012-Jul-02 21:34 UTC
[LLVMdev] Preprocessor: output only definedness testing macro's
Hi all, I'm looking for some guidance on how to implement the following GCC behavior using the Clang libaries. For a simple input file I want to get all the macro's which are actually being tested against in that specific file. The following reproduces the behavior: $ cat > test.c << EOF #ifdef AA #define BLABLA #else #define WUTWUT #endif #ifdef WUTWUT #endif #define X 2 #if X == 2 #define WOT #elif X == 3 #define WOT #else #define FLOP #endif EOF $ cpp -E -dU - < hello.c | egrep "(#undef|#define)" #undef AA #define WUTWUT #define X 2 The -dU option is not implemented in Clang and I'm struggling a bit to get through all the doxygen documentation of the Preprocessor libraries. Any suggestions would be greatly appreciated. Thanks!