| /* PR c/85931 - -Wsizeof-pointer-memaccess for strncpy with size of source |
| { dg-do compile } |
| { dg-require-effective-target alloca } |
| { dg-options "-O2 -Wall -Wstringop-truncation -ftrack-macro-expansion=0" } */ |
| |
| typedef __SIZE_TYPE__ size_t; |
| |
| extern char* strncpy (char*, const char*, size_t); |
| |
| extern char a3[3], b3[3]; |
| extern char a5[5], b5[5]; |
| extern char ax[], bx[]; |
| |
| struct SA |
| { |
| char a3[3], b3[3]; |
| char a5[5], b5[5]; |
| char ax[]; |
| }; |
| |
| void sink (void*, ...); |
| |
| #define T(d, s, n) sink (strncpy (d, s, n)) |
| |
| void test_array (unsigned n) |
| { |
| T (a3, b3, 3); |
| /* For the following statemenmt, GCC 8.1 issues warning: |
| |
| argument to ‘sizeof’ in ‘strncpy’ call is the same expression |
| as the source; did you mean to use the size of the destination? |
| |
| Since the size of both the source and destination the warning |
| isn't helpful. Verify that it isn't issued. */ |
| T (a3, b3, sizeof b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */ |
| |
| T (a3, ax, sizeof a3); /* { dg-warning "\\\[-Wstringop-truncation" } */ |
| T (ax, a3, sizeof a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */ |
| |
| char an[n], bn[n]; |
| sink (an, bn); |
| |
| T (an, bn, sizeof bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */ |
| } |
| |
| void test_member_array (struct SA *sa, unsigned n) |
| { |
| T (sa->a3, sa->b3, 3); |
| T (sa->a3, sa->b3, sizeof sa->b3); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */ |
| |
| T (sa->a3, sa->ax, sizeof sa->a3); /* { dg-warning "\\\[-Wstringop-truncation" } */ |
| T (sa->ax, sa->a3, sizeof sa->a3); /* { dg-warning "argument to .sizeof. in .strncpy. call is the same expression as the source" } */ |
| |
| struct VarLenStruct { |
| char an[n], bn[n]; |
| } x; |
| |
| sink (&x); |
| T (x.an, x.bn, sizeof x.bn); /* { dg-bogus "\\\[-Wsizeof-pointer-memaccess" } */ |
| } |