https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78478
--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> --- The problem is config/i386/rtemself.h has #define LONG_DOUBLE_TYPE_SIZE (TARGET_80387 ? 80 : 64) XFmode isn't available with -msoft-float even when -mlong-double-80 is used. IA MCU defaults long double to double and XFmode is available with -mlong-double-80.
