TODO: fix bug for newer ifort/ifx

[lcrippa]

Recent versions of ifort/ifx (>2019, for what I have been able to accertain) suffer from the following problem:

Some variables are bound to c via iso_c_binding. Some of these variables are used as dimensions of input and return parameters of functions. For example, print_Hloc_nn_c has as input parameter hloc, which is declared to have dimension (Nnambu*Nspin,Nnambu*Nspin,Norb,Norb). In this case, the function is correctly compiled. However, if then the function is called in another module, the compilation fails with

error #7556: The external name for this symbol conflicts with a previously declared external name. [ED_INPUT_VARS^NORB] (and analogously for Nspin)

this holds for a given number of functions, e.g.

• print_hloc
• g0and_bath_array
• f0_bath_array

and so on.

The problem doesn't arise if the variables are not iso_c bound, and it is specific to newer intel compilers (both ifort and the ifx) only.
The precise contours of this remain nebulous to me.

Possible fix:

• replace the parameters in these functions either with dummy (:,:...) and assert_shape, if input parameter, or with allocatable and allocate if return parameter