https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119222
--- Comment #11 from Gwen Fu <gwen3293940943 at gmail dot com> --- Emmmm , This is a bit complicated. But I think the problem must occur in the grammatical analysis or semantic analysis stage I would like to know in which file should the code for floating point (real number) type conversion be located during the compile-time? Based on this ,I want to pinpoint the root cause of the bug . I think I must solve the bug !