https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91264
Bug ID: 91264
Summary: modifying const-qual object in constexpr context not
detected
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
constexpr int
foo ()
{
const int i = 5;
const_cast<int &>(i) = 10;
return i;
}
int
main ()
{
int i = foo ();
}
$ ./cc1plus -quiet w.C
# nothing
$ clang++ -c w.C
w.C:3:1: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
foo ()
^
w.C:6:24: note: modification of object of const-qualified type 'const int' is
not allowed in a constant
expression
const_cast<int &>(i) = 10;
^
1 error generated.
