[Octave-bug-tracker] [bug #53544] -Wclass-memaccess warnings

[Dmitri A. Sergatskov]

URL:
  <http://savannah.gnu.org/bugs/?53544>

                 Summary: -Wclass-memaccess warnings
                 Project: GNU Octave
            Submitted by: dasergatskov
            Submitted on: Sun 01 Apr 2018 06:38:49 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Missed Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

With gcc 8.0.1 I see those (53440f9bffba (stable) tip):



../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<signed char> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:221:74:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<signed char>’} with no trivial copy-assignment; use
copy-assignment or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<signed char>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<short int> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:223:75:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<short int>’} with no trivial copy-assignment; use copy-assignment
or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<short int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<int> >; octave_idx_type = long int]’:
../libinterp/corefcn/typecast.cc:225:75:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<int>’} with no trivial copy-assignment; use copy-assignment or
copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<long int> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:227:75:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<long int>’} with no trivial copy-assignment; use copy-assignment
or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<long int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<unsigned char> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:232:75:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<unsigned char>’} with no trivial copy-assignment; use
copy-assignment or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<unsigned char>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<short unsigned int> >; octave_idx_type =
long int]’:
../libinterp/corefcn/typecast.cc:235:59:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<short unsigned int>’} with no trivial copy-assignment; use
copy-assignment or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<short unsigned int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<unsigned int> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:238:59:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<unsigned int>’} with no trivial copy-assignment; use
copy-assignment or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<unsigned int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~
../libinterp/corefcn/typecast.cc: In instantiation of ‘ArrayType
reinterpret_copy(const void*, octave_idx_type, const dim_vector&) [with
ArrayType = intNDArray<octave_int<long unsigned int> >; octave_idx_type = long
int]’:
../libinterp/corefcn/typecast.cc:241:59:   required from here
../libinterp/corefcn/typecast.cc:80:15: warning: ‘void* memcpy(void*, const
void*, size_t)’ writing to an object of type ‘T’ {aka ‘class
octave_int<long unsigned int>’} with no trivial copy-assignment; use
copy-assignment or copy-initialization instead [-Wclass-memaccess]
   std::memcpy (dest, data, n * sizeof (T));
   ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../liboctave/operators/mx-inlines.cc:40,
                 from ../liboctave/array/MArray.h:30,
                 from ../liboctave/array/MSparse.h:30,
                 from ../liboctave/array/MatrixType.h:29,
                 from ../liboctave/operators/mx-base.h:30,
                 from ../libinterp/corefcn/typecast.cc:30:
../liboctave/util/oct-inttypes.h:847:1: note: ‘T’ {aka ‘class
octave_int<long unsigned int>’} declared here
 octave_int : public octave_int_base<T>
 ^~~~~~~~~~


Dmitri.
-- 





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