A list of non-standard directives supported by Flang
!dir$ fixed and !dir$ free select Fortran source forms. Their effect persists to the end of the current source file.!dir$ ignore_tkr [[(TKRDMAC)] dummy-arg-name]... in an interface definition disables some semantic checks at call sites for the actual arguments that correspond to some named dummy arguments (or all of them, by default). The directive allow actual arguments that would otherwise be diagnosed as incompatible in type (T), kind (K), rank (R), CUDA device (D), or managed (M) status. The letter (A) is a shorthand for all of these, and is the default when no letters appear. The letter (C) checks for contiguity for example allowing an element of an assumed-shape array to be passed as a dummy argument. For example, if one wanted to call a “set all bytes to zero” utility that could be applied to arrays of any type or rank: interface
subroutine clear(arr,bytes)
!dir$ ignore_tkr arr
integer(1), intent(out) :: arr(bytes)
end
end interface
!dir$ assume_aligned desginator:alignment, where designator is a variable, maybe with array indices, and alignment is what the compiler should assume the alignment to be. E.g A:64 or B(1,1,1):128. The alignment should be a power of 2, and is limited to 256. [This directive is currently recognised by the parser, but not handled by the other parts of the compiler].