51 lines · c
1// RUN: %clang_cc1 -std=c23 -E %s | FileCheck %s2 3/* WG14 N3033: Clang 124 * Comma ommission and deletion (__VA_OPT__)5 */6 7#define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)8#define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__)9#define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ })10#define EMP11 12F(a, b, c) // replaced by f(0, a, b, c)13// CHECK: f(0 , a, b, c)14F() // replaced by f(0)15// CHECK: f(0 )16F(EMP) // replaced by f(0)17// CHECK: f(0 )18 19G(a, b, c) // replaced by f(0, a, b, c)20// CHECK: f(0, a , b, c)21G(a, ) // replaced by f(0, a)22// CHECK: f(0, a )23G(a) // replaced by f(0, a)24// CHECK: f(0, a )25 26SDEF(foo); // replaced by S foo;27// CHECK: S foo ;28SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 };29// CHECK: S bar = { 1, 2 };30 31//#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // error: ## may not appear at the beginning of a replacement list (6.10.3.3)32 33#define H2(X, Y, ...) __VA_OPT__(X ## Y,) __VA_ARGS__34H2(a, b, c, d) // replaced by ab, c, d35// CHECK: ab, c, d36 37#define H3(X, ...) #__VA_OPT__(X##X X##X)38H3(, 0) // replaced by ""39// CHECK: ""40 41#define H4(X, ...) __VA_OPT__(a X ## X) ## b42H4(, 1) // replaced by a b43// CHECK: a b44 45#define H5A(...) __VA_OPT__()/**/__VA_OPT__()46#define H5B(X) a ## X ## b47#define H5C(X) H5B(X)48H5C(H5A()) // replaced by ab49// CHECK: ab50 51