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111
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1 /* PR c++/66561 - __builtin_LINE at al. should yield constant expressions */
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2 /* { dg-do compile } */
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3
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4 #if __cplusplus >= 201103L
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5 # define Assert(expr) static_assert ((expr), #expr)
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6 #elif __STDC_VERSION__ >= 201112L
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7 # define Assert(expr) _Static_assert ((expr), #expr)
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8 #else
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9 # define CONCAT(a, b) a ## b
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10 # define CAT(a, b) CONCAT (a, b)
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11 # define Assert(expr) typedef int CAT (Assert_, __LINE__) [1 - 2 * !(expr)]
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12 #endif
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13
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14 /* Verify (in C) that __builtin_FILE() yields an address constant.
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15 This test is ineffective in C++ where initializers of global
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16 objects need not be constant expressions. */
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17 const char* const file = __builtin_FILE ();
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18
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19 /* Verify (in C) that __builtin_FUNCTION() yields an address constant. */
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20 const char* const function = __builtin_FUNCTION ();
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21
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22 /* Also verify that __builtin_constant_p() returns true for both. */
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23 Assert (__builtin_constant_p (__builtin_FILE ()));
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24 Assert (__builtin_constant_p (__builtin_FUNCTION ()));
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25
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26 /* Verify (in both C and C++ 11 and later) that both __builtin_FILE ()
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27 and __builtin_FUNCTION() yield an address constant by making use
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28 of a GCC extension that allows operands of arithmetic constant
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29 expressions to be address constants. (Subtracting two literals
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30 from one another is undefined in both C and C++ and should be
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31 diagnosed. See c/70772.) */
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32
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33 #pragma GCC diagnostic push
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34 #pragma GCC diagnostic ignored "-Waddress"
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35
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36 enum E0 {
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37 e0 = __FILE__ - __FILE__,
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38 e1 = __builtin_FILE () - __builtin_FILE (),
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39
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40 #if !__cplusplus || __cplusplus >= 201103L
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41 /* Skip this test in C++ 98 where GCC rejects __FUNCTION__ in constant
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42 expressions. */
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43 e2 = __FUNCTION__ - __FUNCTION__,
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44 e3 = __builtin_FUNCTION () - __builtin_FUNCTION ()
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45
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46 #endif
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47 };
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48
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49 #pragma GCC diagnostic pop
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50
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51 /* Verify that __builtin_LINE () yields an integer constant expression. */
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52 #line 13
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53 int a [__builtin_LINE ()][__builtin_LINE ()];
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54 enum F { f0 = __builtin_LINE () };
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55 struct S { unsigned bitfield: __builtin_LINE (); } s;
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56
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57 Assert (__builtin_constant_p (__builtin_LINE ()));
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