https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115435
Bug ID: 115435
Summary: Issue warning for indirect call to pure virtual
function in ctor or dtor
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Blocks: 87403
Target Milestone: ---
We warn about undefined calls to pure virtual functions from constructors and
destructors:
struct Base {
virtual void f() = 0;
Base() { f(); }
};
<source>: In constructor 'Base::Base()':
<source>:3:15: warning: pure virtual 'virtual void Base::f()' called from
constructor
3 | Base() { f(); }
| ~^~
But for indirect calls we don't warn:
struct Base {
virtual void f() = 0;
Base() { g(); }
void g() { f(); }
};
It would be good if IPA could warn for this case too. After g() is inlined into
the constructor we know that the call to f() is undefined.
I assume this would mean moving the warning from the front end to the middle
end.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
[Bug 87403] [Meta-bug] Issues that suggest a new warning
