Re: List of C function usable in Ada

["Gisle Sælensminde" <gisle@apal.ii.uib.no>]

Sim Con wrote:
>> Nowhere, I presume - or do you think each and every C program that has been 
>> written in this world exports its functions to a central documentation place.
>> 
>> Seriously, which C functions do you mean?
> 
> Well, i study pragma import just today ;P and i don't understand well
> how and where my compiler (adagide and gnat) takes the C function that i
> use (for example strlen, rename etc.).
> Can you explain me how can i insert other c functions and where the
> compiler has the standard one? Thanx again, sorry for my strange
> questions ;P

I think strlen and rename are part of libc, the standard C library.
On unix and unix-like systems the libc is usually linked to every
executable. GCC (which GNAT is based) was originally implemented 
for unix-like systems, and the ports to non-unix systems contains a
compatibility layer, since the gcc runtime need it. For GNAT
on Windows the mingw library are used. There is also cygwin, that 
unlike mingw tries to be a complete compatibility layer, and not just
the minimum needed to support gnu tools.                        
                                                         
For this reason, strlen etc will always be there. For more interesting
C functions, you must link with the library where they are located when   
building the Ada executable.

--
Gisle S�lensminde ( gisle@ii.uib.no )   

With sufficient thrust, pigs fly just fine. However, this is not
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to land, and it could be dangerous sitting under them as they fly
overhead. (from RFC 1925)