pass_clang::remove-unused-function has encountered a bug

input.c

typedef unsigned char   Bool;
       typedef unsigned char   UChar;
       typedef int             Int32;
       typedef unsigned int    UInt32;
#define True  ((Bool)1)
#define BZ_X_MAGIC_1     10
typedef    struct {
             char *next_in;
          }
          bz_stream;
       typedef    struct {
             bz_stream* strm;
             Int32    state;
             UInt32   bsBuff;
             Int32    bsLive;
          }
          DState;
#define GET_BITS(lll,vvv,nnn)                     \
   case lll: s->state = lll;                      \
   while (True) {                                 \
      if (s->bsLive >= nnn) {                     \
         break;                                   \
      }                                           \
      s->bsBuff                                   \
         = (s->bsBuff << 8) |                     \
           ((UInt32)                              \
              (*((UChar*)(s->strm->next_in))));   \
   }
#define GET_UCHAR(lll,uuu)                        \
   GET_BITS(lll,uuu,8)
Int32 BZ2_decompress ( DState* s ) {
          Int32      retVal;
          Int32  i;
          Int32  alphaSize;
          Int32  nSelectors;
          Int32  EOB;
          Int32  nextSym;
          switch (s->state) {
            GET_UCHAR(BZ_X_MAGIC_1, uc);
            for (i = 0;
      i < nSelectors;
      i++) {
              for (i = 0;
     i < alphaSize;
     i++) {
             }
           }
            while (True) {
              if (nextSym == EOB) break;
           }
         }
          save_state_and_return:    return retVal;
       }