https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97121
Bug ID: 97121
Summary: ICE (segfault) on incorrect default three-way
comparison declaration
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: warp at iki dot fi
Target Milestone: ---
Consider the following code (which mistakenly tries to return 'bool' from the
three-way comparison rather than 'auto'):
//----------------------------------------------------------
#include <compare>
class MyClass
{
int mValue;
public:
MyClass(int value): mValue(value) {}
bool operator<=>(const MyClass&) const = default;
};
int main()
{
MyClass a = 10, b = 15;
return (a < b);
}
//----------------------------------------------------------
Trying to compile it causes a segfault:
------------------------------------------------------------
test.cc: In member function ‘constexpr bool MyClass::operator<=>(const
MyClass&) const’:
test.cc:11:10: internal compiler error: Segmentation fault
11 | bool operator<=>(const MyClass&) const = default;
| ^~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
------------------------------------------------------------
The correct version (ie. with an 'auto' return value) compiles successfully.
