derek.holloway
7502bf64a4
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51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
// RUN: %clang_cc1 -std=c23 -E %s | FileCheck %s
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/* WG14 N3033: Clang 12
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* Comma ommission and deletion (__VA_OPT__)
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*/
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#define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)
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#define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__)
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#define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ })
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#define EMP
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F(a, b, c) // replaced by f(0, a, b, c)
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// CHECK: f(0 , a, b, c)
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F() // replaced by f(0)
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// CHECK: f(0 )
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F(EMP) // replaced by f(0)
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// CHECK: f(0 )
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G(a, b, c) // replaced by f(0, a, b, c)
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// CHECK: f(0, a , b, c)
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G(a, ) // replaced by f(0, a)
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// CHECK: f(0, a )
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G(a) // replaced by f(0, a)
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// CHECK: f(0, a )
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SDEF(foo); // replaced by S foo;
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// CHECK: S foo ;
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SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 };
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// CHECK: S bar = { 1, 2 };
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//#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // error: ## may not appear at the beginning of a replacement list (6.10.3.3)
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#define H2(X, Y, ...) __VA_OPT__(X ## Y,) __VA_ARGS__
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H2(a, b, c, d) // replaced by ab, c, d
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// CHECK: ab, c, d
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#define H3(X, ...) #__VA_OPT__(X##X X##X)
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H3(, 0) // replaced by ""
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// CHECK: ""
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#define H4(X, ...) __VA_OPT__(a X ## X) ## b
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H4(, 1) // replaced by a b
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// CHECK: a b
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#define H5A(...) __VA_OPT__()/**/__VA_OPT__()
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#define H5B(X) a ## X ## b
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#define H5C(X) H5B(X)
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H5C(H5A()) // replaced by ab
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// CHECK: ab
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