The -fexcess-precision=standard option, which is enabled by -std=c99 (requesting ICO C99 compliance), forces excess precision to be rounded away on all assignme

The -fexcess-precision=standard option, which is enabled by -std=c99 (requesting ICO C99 compliance), forces excess precision to be rounded away on all assignments and casts to narrower precision types. See https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fexcess-precision-960 https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#ind...