https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
Bug ID: 110493
Summary: 'is not a constant expression' for function-local
static std::initializer_list<std::string> with
fsanitize=undefined
Product: gcc
Version: 12.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot uk
Target Milestone: ---
Since 12.3.0, under -fsanitize=undefined -std=c++20:
#include <initializer_list>
#include <string>
void f() {
static auto a = {std::string()};
}
error: '(((const std::__cxx11::basic_string<char>*)(& <temporary>)) != 0)' is
not a constant expression
Clearly this is an instance of bug 71962, but this is in fairly unexceptional
code and could make ubsan unusable; it's not obvious that this code should have
anything to do with constant evaluation.
Since it only appears in a point release I would hope it might be possible to
fix in library for this specific case, within <initializer_list>?
