https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90728
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-06-03
CC| |msebor at gcc dot gnu.org
Component|c |c++
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed in C++. The code that issues the warning is the same between C and
C++:
if (COMPLETE_TYPE_P (elt_type)
&& !integer_onep (TYPE_SIZE_UNIT (elt_type))
&& domain != NULL_TREE
&& TYPE_MAX_VALUE (domain)
&& TYPE_MIN_VALUE (domain)
&& integer_zerop (TYPE_MIN_VALUE (domain))
&& integer_onep (fold_build2 (MINUS_EXPR, domain,
arg2,
TYPE_MAX_VALUE (domain))))
warning_at (loc, OPT_Wmemset_elt_size,
"%<memset%> used with length equal to "
"number of elements without multiplication "
"by element size");
but the difference is that in C the domain of the zero-length array is [0,
null] while in C++ it's [0, SIZE_MAX]. I.e., TYPE_MAX_VALUE (domain) is null
in C which makes the if condition evaluate to false.
