https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110124
Bug ID: 110124 Summary: Not inlining comparison operator when using std::tie with -std=c++20 Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: vakili at live dot com Target Milestone: --- Here is a simple class with a operator<(): struct A { int a0; int a1; int a2; friend inline constexpr bool operator<(const A& x, const A& y) { return std::tie(x.a0, x.a1, x.a2) < std::tie(y.a0, y.a1, y.a2); } }; When compiling this code with -std=c++17 the operator will be inlined at usage location. But when compiled with -std=c++20 it will not be inlined. Here is the compiler explorer snippet showing the situation: https://godbolt.org/z/4KdzWjvx4 The problem exists from g++ 10.0 to the trunk (14.0).