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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: The best possible way to call a function in a shared library
Date: Wed, 4 Oct 2017 10:10:34 +0200
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Xref: news.eternal-september.org comp.lang.ada:48338
Date: 2017-10-04T10:10:34+02:00
List-Id: <comp.lang.ada>

On 04/10/2017 04:10, John Smith wrote:

>> I did what you suggested and this is the error that I'm getting now:
>>
>> gnatmake : gnatmake: could not find the main ALI file
>> At line:1 char:1
>> + gnatmake -l../../../src .\main_static.adb -largs -L../../../bin/debug ...
>> + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>      + CategoryInfo          : NotSpecified: (gnatmake: could...e main ALI file:String) [], RemoteException
>>      + FullyQualifiedErrorId : NativeCommandError
>>
>> Why do the ALI files matter?  Aren't the definitions in the *.ads files?  Are the *.o file needed as well?

It is GNAT-specific. You can think about it this way. *.ali to *.ads is 
what *.o to *.adb is. But *.o can be put into a library while *.ali 
cannot because GNU linker does not know Ada.

> Also, I've tried this and got the following result:
> 
> $ gnatmake -l../../../src main_static.adb -A../../../ali/debug -largs -L../../../bin/debug -lsimpleLibs
> gnatmake : gnatmake: missing source directory name
> At line:1 char:1
> + gnatmake -l../../../src main_static.adb -A../../../ali/debug -largs - ...
> + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>      + CategoryInfo          : NotSpecified: (gnatmake: missing source directory name:String) [], RemoteException
>      + FullyQualifiedErrorId : NativeCommandError
> 
> Now the complaint is about the lack of a source file... *sigh*

    gnatmake -l../../../src
             -aL../../../ali/debug
             main_static.adb
             -largs -L../../../bin/debug -lsimpleLibs

That is why project files to be used. Otherwise you must fine tune 
gnatmake options. That's the price to pay.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de