https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90243
Bug ID: 90243
Summary: diagnostic notes that belong to a suppressed error
about an uninitialized variable in a constexpr
function are still shown
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kretz at kde dot org
Target Milestone: ---
Test case (https://godbolt.org/z/34KB20):
struct Z {
int y;
};
template <class T>
constexpr Z f(const T *data) {
Z z;
__builtin_memcpy(&z, data, sizeof(z));
return z;
}
constexpr Z g(const char *data) { return f(data); }
This prints:
<source>: In instantiation of 'constexpr Z f(const T*) [with T = char]':
<source>:12:48: required from here
<source>:1:8: note: 'struct Z' has no user-provided default constructor
<source>:2:7: note: and the implicitly-defined constructor does not initialize
'int Z::y'
If f is not a template, `Z z;` is an error and the notes explain the error. But
when f is a template the error is suppressed (seems correct). However the notes
that explain the error are still shown. Whether the notes are shown should use
the same condition as the error.
