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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: cocor_ada: Sets, FileIO?
Date: Wed, 10 Aug 2016 17:58:17 +0100
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Date: 2016-08-10T17:58:17+01:00
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hreba <f_hreba@yahoo.com.br> writes:

> I am stuck
> at the last step:
>
>> gcc cr.o -o acr
>
> I get a large number of "undefined reference errors", starting with
>
> /usr/lib/x86_64-linux-gnu/crt1.o: In function `_start':
> (.text+0x20): undefined reference to `main'
> cr.o: In function `_ada_cr':

The problem is that gprbuild (which Pascal was using) can be very
misleading about the command lines it actually issues.

So when Pascal said

$ gprbuild -P acr.gpr -aP /usr/local/xnadalib-2016/share/gpr
gcc -c fileio.adb
fileio.adb:529:16: warning: index for "ext" may assume lower bound of 1
fileio.adb:529:16: warning: suggested replacement: "ext'First"
fileio.adb:529:42: warning: index for "ext" may assume lower bound of 1
fileio.adb:529:42: warning: suggested replacement: "ext'First"
gcc -c sets.adb
gprbind cr.bexch
gnatbind cr.ali
gcc -c b__cr.adb
gcc cr.o -o acr

all those lines are just a hint of what was actually going on; you need
to call gprbuild to manage the process.