| // RUN: %clang_cc1 -std=c23 -E %s | FileCheck %s |
| |
| /* WG14 N3033: Clang 12 |
| * Comma ommission and deletion (__VA_OPT__) |
| */ |
| |
| #define F(...) f(0 __VA_OPT__(,) __VA_ARGS__) |
| #define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__) |
| #define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ }) |
| #define EMP |
| |
| F(a, b, c) // replaced by f(0, a, b, c) |
| // CHECK: f(0 , a, b, c) |
| F() // replaced by f(0) |
| // CHECK: f(0 ) |
| F(EMP) // replaced by f(0) |
| // CHECK: f(0 ) |
| |
| G(a, b, c) // replaced by f(0, a, b, c) |
| // CHECK: f(0, a , b, c) |
| G(a, ) // replaced by f(0, a) |
| // CHECK: f(0, a ) |
| G(a) // replaced by f(0, a) |
| // CHECK: f(0, a ) |
| |
| SDEF(foo); // replaced by S foo; |
| // CHECK: S foo ; |
| SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 }; |
| // CHECK: S bar = { 1, 2 }; |
| |
| //#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // error: ## may not appear at the beginning of a replacement list (6.10.3.3) |
| |
| #define H2(X, Y, ...) __VA_OPT__(X ## Y,) __VA_ARGS__ |
| H2(a, b, c, d) // replaced by ab, c, d |
| // CHECK: ab, c, d |
| |
| #define H3(X, ...) #__VA_OPT__(X##X X##X) |
| H3(, 0) // replaced by "" |
| // CHECK: "" |
| |
| #define H4(X, ...) __VA_OPT__(a X ## X) ## b |
| H4(, 1) // replaced by a b |
| // CHECK: a b |
| |
| #define H5A(...) __VA_OPT__()/**/__VA_OPT__() |
| #define H5B(X) a ## X ## b |
| #define H5C(X) H5B(X) |
| H5C(H5A()) // replaced by ab |
| // CHECK: ab |
| |
