derek.holloway
7502bf64a4
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32 lines
858 B
C
32 lines
858 B
C
// RUN: %clang_cc1 -verify -std=c99 %s
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// RUN: %clang_cc1 -E -std=c99 %s | FileCheck %s
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// expected-no-diagnostics
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/* WG14 N570: Yes
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* Empty macro arguments
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*
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* NB: the original paper is not available online anywhere, so the test
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* coverage is coming from what could be gleaned from the C99 rationale
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* document. In C89, it was UB to pass no arguments to a function-like macro,
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* and that's now supported in C99.
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*/
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#define TEN 10
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#define U u
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#define I // expands into no preprocessing tokens
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#define L L
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#define glue(a, b) a ## b
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#define xglue(a, b) glue(a, b)
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const unsigned u = xglue(TEN, U);
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const int i = xglue(TEN, I);
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const long l = xglue(TEN, L);
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// CHECK: const unsigned u = 10u;
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// CHECK-NEXT: const int i = 10;
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// CHECK-NEXT: const long l = 10L;
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_Static_assert(u == 10U, "");
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_Static_assert(i == 10, "");
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_Static_assert(l == 10L, "");
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