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annotate gcc/testsuite/gcc.dg/Wstringop-truncation-3.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents
children 1830386684a0
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131
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1 /* PR c/85931 - -Wsizeof-pointer-memaccess for strncpy with size of source
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2 { dg-do compile }
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3 { dg-options "-O2 -Wall -Wstringop-truncation -ftrack-macro-expansion=0" } */
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4
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5 typedef __SIZE_TYPE__ size_t;
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6
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7 extern char* strncpy (char*, const char*, size_t);
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8
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9 extern char a3[3], b3[3];
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10 extern char a5[5], b5[5];
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11 extern char ax[], bx[];
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12
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13 struct SA
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14 {
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15 char a3[3], b3[3];
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16 char a5[5], b5[5];
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17 char ax[];
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18 };
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19
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20 void sink (void*, ...);
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21
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22 #define T(d, s, n) sink (strncpy (d, s, n))
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23
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24 void test_array (unsigned n)
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25 {
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26 T (a3, b3, 3);
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27 /* For the following statemenmt, GCC 8.1 issues warning:
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28
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29 argument to ‘sizeof’ in ‘strncpy’ call is the same expression
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30 as the source; did you mean to use the size of the destination?
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31
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32 Since the size of both the source and destination the warning
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33 isn't helpful. Verify that it isn't issued. */
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34 T (a3, b3, sizeof b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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35
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36 T (a3, ax, sizeof a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
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37 T (ax, a3, sizeof a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
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38
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39 char an[n], bn[n];
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40 sink (an, bn);
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41
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42 T (an, bn, sizeof bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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43 }
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44
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45 void test_member_array (struct SA *sa, unsigned n)
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46 {
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47 T (sa->a3, sa->b3, 3);
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48 T (sa->a3, sa->b3, sizeof sa->b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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49
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50 T (sa->a3, sa->ax, sizeof sa->a3); /* { dg-warning "\\\[-Wstringop-truncation" } */
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51 T (sa->ax, sa->a3, sizeof sa->a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */
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52
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53 struct VarLenStruct {
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54 char an[n], bn[n];
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55 } x;
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56
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57 sink (&x);
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58 T (x.an, x.bn, sizeof x.bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */
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59 }