[iso_c_binding] Add symbolic id for symbols coming from intrinsic modules

[FX Coudert <fxcoudert at gmail dot com>]

Hi all,

The following patch, commited to the fortran-experiments branch after  
bootstrap and regtesting on i686-linux, adds symbolic id to the  
symbols created from intrinsic modules. This will probably make our  
life easier in some parts of the ISO_C_BINDING by being able to  
uniquely identify if a given symbol comes from an intrinsic module,  
which intrinsic module it's coming from and what symbol it is  
exactly. It will also be required for the future integration of the  
IEEE modules (but I'll only start working on that when ISO_C_BINDING  
is merged into mainline, I promise!)

It does so by adding two new fields to the gfc_symbol structure:
  + from_intmod is INTMOD_NONE (that is, 0) when a symbol does not  
come from an intrinsic module, and the module ID number (defined in  
the intmod_id enumeration) : INTMOD_ISO_FORTRAN_ENV or  
INTMOD_ISO_C_BINDING.
  + intmod_sym_id is the numeric id of the symbol, which is unique  
to each defined entity in a given intrinsic module; that is, an enum  
is set up for each intrinsic module (I'm reusing  
iso_c_binding_symbol, in fact, and adding iso_fortran_env_symbol)

This enabled me to rework the ISO_FORTRAN_ENV code a bit, avoiding a  
few (always expensive) string comparisons. The overall patch is very  
limited, as you can see (most of it is the module.c ISO_FORTRAN_ENV  
reworking).

FX


2007-01-21  Francois-Xavier Coudert  <coudert@clipper.ens.fr>

        * gfortran.h: Add new fields from_intmod and intmod_sym_id  
to the
        gfc_symbol structure, to keep track of symbols coming from
        intrinsic modules so we can special-case them when needed.
        * symbol.c (generate_isocbinding_symbol): Set these new fields.
        * module.c: Set these new fields, and use the fact that we know
        have a symbolic id per symbol to rework the code dealing with
        ISO_FORTRAN_ENV.

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