Re: Accessing C macro constants from Ada95

["Tarjei Tj�stheim Jensen" <tarjei.jensen@kvaerner.no>]

Markus Kuhn wrote :
>Ada does indeed have nice facilities to access functions and variables
>in C object files, but what has been completely forgotten is that
>under C, traditionally a very significant part of the API comes
>in the form of numeric macro constants defined in *.h files. And
>Ada95 does not provide a portable way to get at these. Ada
>programmers should not have to write buggy and dangerous Perl
>hacks again and again to get access to the constants in C header
>files. That I think is the main reason why people are interested
>in POSIX.5, which provides all the necessary constants at least
>for this important API.


In order to do this you would need to implement a complete C preprocessor and
probably parts of the compiler as well.

 It is completely unpractical compared to writing a C program that generates
the apropriate module(s) or perhaps one should link the Ada program with a C
module that provides the answers.


Greetings,