[Tinycc-devel] Preprocessing behavior

[Patrick Pelissier]

Hello,

I think I found a bug in the preprocessor of tcc.

The following program:

#define M_RETI_ARG27(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,aa,
...)    aa
#define M_RET_ARG27(...)        M_RETI_ARG27(__VA_ARGS__)
#define M_COMMA_P(...)          M_RET_ARG27(__VA_ARGS__, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
useless)
#define M_EMPTYI_DETECT(...)    0, 1,
#define M_EMPTYI_P_C1(...)      M_COMMA_P(M_EMPTYI_DETECT __VA_ARGS__ () )

M_EMPTYI_P_C1()
M_EMPTYI_P_C1(x)


produces the following output with the command "tcc -E"

0
0

instead of the expected output:

1
0

tested with tcc 536ed76d5a69d8e3c0e247d6557f5942818cb253

--
 Regards,
  Patrick Pélissier