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Newsgroups: comp.lang.ada
Date: Wed, 28 Jun 2023 11:25:26 -0700 (PDT)
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Subject: Re: Very basic question: How to use gnatmake (not gprbuild) using
 external libraries?
From: Kenneth Wolcott <kennethwolcott@gmail.com>
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On Wednesday, June 28, 2023 at 12:20:09=E2=80=AFAM UTC-7, Jeffrey R.Carter =
wrote:
> On 2023-06-28 01:44, Kenneth Wolcott wrote:=20
> >=20
> > 1. Where do I place the SDL library from GitHub?
> That is up to you. It goes in /path/to/SDL/, where you choose /path/to/.

Cool.

> > 2. Do I compile/install the package?
> The library may have specific compilation/installation instructions. Gene=
rally=20
> you should follow those.

Ok.

> > 3. When using gnatmake do I use -I to specify where the library I'm ref=
erencing is found?
> This depends on the answer to 2. If you have all the source files for the=
=20
> library in /path/to/SDL/, and have compiled them so their .ali and .o fil=
es are=20
> also there, then using -I/path/to/SDL/ works fine. This is simple and eas=
y. As=20
> S/W engineers always try to keep things as simple as possible, this is th=
e=20
> approach I tend to use.=20

Use "-I/path", but do not use "-L/path"?

> Coders, on the other hand, like to introduce unnecessary complexity, and =
you=20
> will find lots of projects with baroque directory structures, maybe with =
source=20
> files in /path/to/SDL/src/, .ali and .o files in /path/to/SDL/lib/, test =
program=20
> source files in /path/to/SDL/test/src, their .ali and .o files in=20
> /path/to/SDL/test/lib/, and executables in /path/to/SDL/test/bin/. Such=
=20
> directory structures are gnatmake unfriendly, and the simple -I approach =
doesn't=20
> work. You'll have to look into the exact meaning of -I and -a, and maybe =
others.

Yeah, I like to keep things simple as well :-)

I'm not sure I understand the distinction between "-I/path" and "-L/path". =
 I think when one includes ("-I/path") something it will be compiled along =
with what I'm trying to compile and when I use "-L/path" it means use *.obj=
, *.ali, etc at the linking stage.  Is that correct?

> > 4. Once #3 is answered, I assume that I "with package" as if the '*.ad[=
sb]' files were co-located with my Ada program, is that correct?
> The Ada language definition is independent of how and where source and=20
> compilation artifacts are stored, so context clauses are necessarily inde=
pendent=20
> of such concepts. In other words, yes. This kind of information is handle=
d by=20
> the compilation options such as -I.=20

Thank you for the info!

Now I will make a new post regarding the compilation error I received with =
the SDL package.

Thanks,
Ken Wolcott

> --=20
> Jeff Carter=20
> "He nevere yet no vileynye ne sayde=20
> In al his lyf unto no maner wight."=20
> Canterbury Tales=20
> 156