https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117381
--- Comment #3 from Jordan <8e3g6jay6 at mozmail dot com> --- I tested this: program main use, intrinsic :: iso_c_binding implicit none integer :: VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ACCELERATION_STRUCTURE_PROPERTIES_KHR = 1 end program main with: gfortran -std=f95 -fmax-identifier-length=80 ./app/main.f90 with result: f951: Fatal Error: Maximum supported identifier length is 63 compilation terminated.