Viewing file:  Wclass-memaccess-2.C (1.36 KB) -rw-r--r--
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// PR c++/81169 - -Wclass-memaccess illegitimate warning related to volatile
// { dg-do compile }
// { dg-options "-Wclass-memaccess" }
struct S { int x; };
void cast_const (const S *p)
{
__builtin_memset (const_cast<S*>(p), 0, sizeof *p);
}
void cast_volatile (volatile S *p)
{
__builtin_memset (const_cast<S*>(p), 0, sizeof *p);
}
void cast_const_volatile (const volatile S *p)
{
__builtin_memset (const_cast<S*>(p), 0, sizeof *p);
}
void c_cast_const_volatile (const volatile S *p)
{
__builtin_memset ((S*)p, 0, sizeof *p);
}
// A C cast to void* suppresses the warning because it casts away
// the qualifiers from the otherwise trivial pointed-to type..
void c_void_cast_const_volatile (const volatile S *p)
{
__builtin_memset ((void*)p, 0, sizeof *p);
}
// Also verify that casting to char* suppresses the warning for
// non-trivial types.
struct NonTrivial
{
NonTrivial ();
NonTrivial (const NonTrivial&);
NonTrivial& operator= (const NonTrivial&);
~NonTrivial ();
};
void cast_void (NonTrivial *p)
{
__builtin_memset (reinterpret_cast<char*>(p), 0, sizeof *p);
}
// A C cast to a character (or any trivial) type suppresses the warning.
void c_cast_uchar (NonTrivial *p)
{
__builtin_memset ((unsigned char*)p, 0, sizeof *p);
}
void c_cast_void (NonTrivial *p)
{
__builtin_memset ((void*)p, 0, sizeof *p); // { dg-bogus "\\\[-Wclass-memaccess]" }
}
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