The following code generates a recursive inlining error in 4.3.[01] while it did not in 4.[12]. Somehow, the bug requires having both always_inline attributes.
template<typename T> struct B { struct C { __attribute__((always_inline)) C(C const &c) { } }; void __attribute__((always_inline)) g(C c) { } }; void trigger(B<int> b, B<int>::C c) { b.g(c); } Cleanup4.ii: In function 'void trigger(B<int>, B<int>::C)': Cleanup4.ii:8: sorry, unimplemented: inlining failed in call to 'void B<T>::g(B<T>::C) [with T = int]': recursive inlining Cleanup4.ii:15: sorry, unimplemented: called from here -- Summary: [4.3 Regression] attribute always_inline -> sorry, unimplemented: recursive inlining Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: josep dot m dot perez at bsc dot es GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36631