Hi Tobias,
What is the proper way to obtain this information?
I fear the answer to this question is "there's no way". We already discussed that a few months ago, at the thread starting here: http:// gcc.gnu.org/ml/gcc/2006-10/msg00346.html From private discussion, with Paul Brook & Joseph Myers IIRC, the conclusion is that GCC can't do that right now, but it could if target-specific files provided the information. Maybe there's a PR open for that, otherwise you can open it, and we can try to get people implement the framework for this...
Christopher's original ISO_C_BINDING patch used autoconf to guess it, and I remove that (before creating the fortran-experiments branch). Currently, there's no other option than to return -2 for the corresponding ISO_C_BINDING constants.
FX
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