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131
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1 /* PR tree-optimization/71625 - missing strlen optimization on different
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2 array initialization style
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3
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4 Verify that zero-length array initialization results in the expected
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5 array sizes.
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6
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7 { dg-do compile }
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8 { dg-options "-Wall -Wno-unused-local-typedefs" } */
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9
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10 #define A(expr) typedef char A[-1 + 2 * !!(expr)];
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11
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12 const char a[] = { };
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13
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14 A (sizeof a == 0);
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15
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16
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17 const char b[0] = { };
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18
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19 A (sizeof b == 0);
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20
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21
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22 const char c[0] = { 1 }; /* { dg-warning "excess elements" } */
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23
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24 A (sizeof c == 0);
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25
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26
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27 void test_auto_empty (void)
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28 {
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29 const char a[] = { };
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30
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31 A (sizeof a == 0);
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32 }
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33
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34 void test_auto_zero_length (void)
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35 {
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36 const char a[0] = { };
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37
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38 A (sizeof a == 0);
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39
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40 const char b[0] = { 0 }; /* { dg-warning "excess elements" } */
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41
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42 A (sizeof b == 0);
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43
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44 const char c[0] = "";
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45
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46 A (sizeof c == 0);
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47 }
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48
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49
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50 void test_compound_zero_length (void)
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51 {
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52 A (sizeof (const char[]){ } == 0);
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53 A (sizeof (const char[0]){ } == 0);
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54 A (sizeof (const char[0]){ 0 } == 0); /* { dg-warning "excess elements" } */
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55 A (sizeof (const char[0]){ 1 } == 0); /* { dg-warning "excess elements" } */
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56 A (sizeof (const char[0]){ "" } == 0);
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57 A (sizeof (const char[0]){ "1" } == 0); /* { dg-warning "too long" } */
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58 }
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