https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114866
Jiang An <de34 at live dot cn> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |de34 at live dot cn --- Comment #1 from Jiang An <de34 at live dot cn> --- It seems that the primary tempate of __is_shared_ptr should be made available in freestanding mode.