41 /* From gcc/testsuite/gcc.dg/cpp/vararg2.c */

    42 /* C99 __VA_ARGS__ versions */

    43 #define c99_count(...)    _c99_count1 ( , ##__VA_ARGS__)/* If only ## worked.*/

    44 #define _c99_count1(...)  _c99_count2 (__VA_ARGS__,10,9,8,7,6,5,4,3,2,1,0)

    45 #define _c99_count2(_,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,n,...) n

    46 

    47 #define FULL_ARGS_0()

    48 #define FULL_ARGS_1(X0)  X0 a0

    49 #define FULL_ARGS_2(X0,X1)  X0 a0, X1 a1

    50 #define FULL_ARGS_3(X0,X1,X2)  X0 a0, X1 a1, X2 a2

    51 #define FULL_ARGS_4(X0,X1,X2,X3)  X0 a0, X1 a1, X2 a2, X3 a3

    52 #define FULL_ARGS_5(X0,X1,X2,X3,X4)  X0 a0, X1 a1, X2 a2, X3 a3, X4 a4

    53 

    54 #define _ARGS_0()

    55 #define _ARGS_1(X0)  a0

    56 #define _ARGS_2(X0,X1)   a0, a1

    57 #define _ARGS_3(X0,X1,X2)  a0, a1, a2

    58 #define _ARGS_4(X0,X1,X2,X3)  a0, a1, a2, a3

    59 #define _ARGS_5(X0,X1,X2,X3,X4) a0, a1, a2, a3, a4

    60 

    61 #define CAT(a, ...) PRIMITIVE_CAT(a, __VA_ARGS__)

    62 #define PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__

    63   

    64 #define  FULL_ARGS(...) CAT(FULL_ARGS_,c99_count (__VA_ARGS__))(__VA_ARGS__)

    65 #define  ARGS(...) CAT(_ARGS_,c99_count (__VA_ARGS__))(__VA_ARGS__)

    66 

    67 

    68 #define DCE_EXPLICIT(name,rtype,...)                                    \

    69   rtype name (FULL_ARGS(__VA_ARGS__))    \

    70   {                                                             \

    71     return g_libc.name ## _fn (ARGS(__VA_ARGS__));              \

    72   }