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Re: [Gm2] do I need separate libfiles for every module?

From: Gaius Mulley
Subject: Re: [Gm2] do I need separate libfiles for every module?
Date: Wed, 06 Jan 2010 12:06:04 +0000
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)

Martin Kalbfuß <address@hidden> writes:

> Hi,
> I have the following lines:
> gm2 -c test.mod -I../def
> gm2 test.mod -L../src/.libs -lsk -lSDL
> The first line works like I would expect it.
> But the second line does not.
> gm2 says:
> cannot find SKVideo.o or SKVideo.a

Hi Martin,

> This is an imported module.

a normal Modula-2 module (not a DEFINITION MODULE FOR "C").

> He cannot find them because there are no such files. SKVideo.o is part
> of libsk.a
> Why does the linking step need an object file with the same name as the
> module?

it currently builds a list of objects which it passes to gcc for the
final link.

> When I work with C and gcc, it's completely up to me where the code is,
> as long as I link it

ok.  Sure this is true - gm2 could be altered to work in the same way.
Perhaps it should check for .o files first of all and if they do not
exist continue by looking for .a files and lastly add in the -llibs
and pass the whole collection to gcc for the link.  We would get
slightly less helpful error messages at link time if it fails but it
would match the gcc behaviour.

> I would do
> gcc -c test.c -I../include
> gcc -o test test.o -L../src/.libs -lsk -lSDL
> or I could do
> gcc -o test test.o SKVideo.o -lSDL
> With gm2, only the second variant works. Is there a reason for this?
> I find this behaviour more confusing hen helpfull. If he can't find the
> referenced functions in the symbol table he tells me anyway with an
> undefined reference error.

true - it can be altered to match this behaviour..  The main point of
difference is that gm2 will build the list of objects necessary for
linking from the module imports.  But it could be altered so that it
does not insist on these being present


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