https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92826
--- Comment #7 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- (In reply to kim.walisch from comment #0) > GCC should definitely not warn when using constants from <quadmath.h>. GCC > should also provide an option to disable these warnings (e.g. > -Wno-non-standard-suffix). People are currently using disgusting hacks to > avoid these warnings so please add an option for that. Also, adding a new warning option is relatively easy: 1. Add the option to gcc/c-family/c.opt 2. Edit the point of the warning to use the new option 3. Add documentation for the option in gcc/doc/invoke.texi 4. Add/update existing tests to test for the option See also: https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps