C code

C code

[Henry the mild mannered janitor]

Can GNAT 3.04 compile standalone C code that's independant of an .adb
file?

Re: C code

[Robert Dewar]

Henry asked

"Can GNAT 3.04 compile standalone C code that's independant of an .adb
file?"


GNAT is an Ada compiler, so certainly it cannot compile C. However GNAT is
part of the multi-language compiler gcc, and one of the other front ends
(the GNU C front end) can definitely compile C. Furthermore, all
distributions of GNAT include the C front end.

So all you have to do is gcc -c xxx.c

to compile a C file (gcc knows what front end to call by looking at the
extension of the file being compiled -- although this can be overridden
with the -x switch).

Re: C code

[Pascal Obry]

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Henry the mild mannered janitor <nicnac@dial.pipex.com> wrote:

>Can GNAT 3.04 compile standalone C code that's independant of an .adb
>file?

Yes.

Pascal.



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Re: C code

[chris.danx]

sk wrote:

 > Also, for DLLI, the "init" and "fini" are red-herrings (not
 > deliberate)
 > these are only issues for building a dynamic-library, not the loading
 > of them thru DLLI.

So all I need to do is to detect whether the library is an Ada lib or
not and if it is call Adainit upon load and adafinal upon close?

 > Hopefully this is better

I just got a wee bit of time to work on this and hadn't done anything
for a while, so I'm sorry my reply is a bit late.  Unfortunately I
killed the wrong partition trying to install Gentoo and the binding as
was became one with the ether  (killed the backup partition :( ).  I've 
almost finished rewriting it and will do some examples including some 
with GtkAda first chance I get.


Bye,
Chris

Re: C code

[sk]

Hi,

 > So all I need to do is to detect whether the library is an Ada lib or
 > not and if it is call Adainit upon load and adafinal upon close?

I guess you could, but I wouldn't.

For the DLLI interface, leave it to the called library user to know
whether the library containes "adainit" and "adafinal" because it
was developed in Ada with GNAT.

For an Ada library (GNAT developed since other compilers probably
do things differently) to be useful and transparent to C callers,
then one would try to associate the "adainit" and "adafinal" to the
automatic "init" and "fini" functions. These functions are called
by the dynamic-loader when you do a "dlopen()"

In general, I would not try to put "adainit" and "adafinal" in the
dlli package, let the user worry about it.

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Re: C code

[Robert A Duff]

sk <sk@noname.com> writes:

> For the DLLI interface, leave it to the called library user to know
> whether the library containes "adainit" and "adafinal" because it
> was developed in Ada with GNAT.

Adainit and adafinal are standard Ada -- not GNAT specific.

- Bob