[Rd] array-bound error with GCC 13/14

[Olivier Benz]

> On 9 May 2025, at 19:29, Kevin Ushey <kevinushey using gmail.com> wrote:
> 
> Hopefully a member of the CRAN team will tell me I'm wrong, but I
> think whether or not there is a compiler bug is ultimately irrelevant
> -- packages on CRAN must compile cleanly even with potentially-buggy
> development versions of compilers.

I disagree. This would be even worse than rejecting packages that use deprecated code.

xref: https://github.com/nx10/httpgd/issues/218

> 
> So, whether or not there is a bug in gcc is moot -- you'll need to
> find a way to avoid triggering this issue in your package code.
> 
> Best,
> Kevin
> 
> On Fri, May 9, 2025 at 6:18 AM Ivan Krylov via R-devel
> <r-devel using r-project.org> wrote:
>> 
>> В Fri, 9 May 2025 11:09:22 +1000
>> Stephen Wade <stephematician using gmail.com> пишет:
>> 
>>>    inlined from ‘std::vector<double> literanger::adjust_pvalues(const
>>> std::vector<double>&)’ at ../src/literanger/utility_math.h:99:48:
>>> /usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
>>> __builtin_memmove(void*, const void*, long unsigned int)’ writing
>>> between 9 and 9223372036854775807 bytes into a region of size 8
>>> overflows the destination [-Wstringop-overflow=]
>>>  437 |      __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
>> 
>> The same problem (different reproducer, slightly different warning, but
>> same place in the standard library and similar circumstances) has been
>> reported as a false positive in GCC, Bug 109717:
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109717
>> 
>> There are comments by GCC developers acknowledging that the overflow
>> detection may "detect" overflows in code paths that cannot be taken,
>> but they don't see an easy way to fix the warnings on the compiler side.
>> 
>> --
>> Best regards,
>> Ivan
>> 
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> 
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