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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: ada compiler?
Date: Tue, 13 Nov 2007 22:27:01 +0000
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<adaworks@sbcglobal.net> writes:

> "Bill Cunningham" <nospam@nspam.com> wrote in message 
> news:A75Zi.24$Vp3.16@trnddc05...
>>    I have just began looking at the ada language and some tutorials
>> but I have no idea how to compile ada programs. I am using gcc with
>> C,C++, and Ada support. Do Ada programs have to end in .ads ? How
>> do I work the compiler?
>>
> Ada programs are not required to end in .adb or .ads.  This is a
> convention adopted by GNAT.  Seom compilers allow files to end in
> any extension you want to choose.  Also, GNAT requires that the
> internal name match the file name.  This is also a convention unique
> to GNAT.  Other compilers allow a mismatch between the internal name
> and the external name.

GNAT doesn't normally mind too much if the main program has the wrong
name; I just saved the normal Hello program as hi.ada and gnatmake
said

   grendel:~/tmp simon$ gnatmake hi.ada
   gcc -c -x ada hi.ada
   hi.ada:2:11: warning: file name does not match unit name, should be "hello.adb"
   gnatbind -x hi.ali
   gnatlink hi.ali
   grendel:~/tmp simon$ ./hi 
   hello.

You do have to jump through hoops if you want this to work with
with'ed units, though.

--S