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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: GNAT GPL2016 on Ubuntu 15.04 and Debian 8
Date: Tue, 04 Oct 2016 12:24:20 +0100
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Date: 2016-10-04T12:24:20+01:00
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"M. Enzmann" <enzmann.m@googlemail.com> writes:

> I am using GNAT GPL2016 to compile the Ada Drivers Library and the
> Embedded Runtimes from GitHub.
>
> I am a little puzzled about the results I get. I managed to compile
> and run some of the examples on a STM32F4 Discovery board. So far, so
> good.
>
> I do get however, a couple of error (?) messages at the end of the
> compilation process, telling me, that arm-eabi-ar failed due a wrong
> ELF-class (error message is in German, something like...
> '<path>/bin/arm-eabi-ar: /<path>/lib/bfd-plugins/liblto_plugin.so:
> wrong ELF-Class ELFCLASS64'

It looks to me as though I got this problem (Debian jessie): I've
renamed lib/bfd-plugins to lib/bfd-plugins-xxx (so the compiler doesn't
find it).

> In the end the executables I get, when compiling the examples, show
> two symbols annotated with '?' in nm, the symbols being
> '__ccmdata_end' and '_ccmdata_start'

This is the 64 K Core Coupled Memory[1]. I haven't checked the examples;
maybe they put something there? My own code doesn't - arm-eabi-nm says

$ arm-eabi-nm pcf8574a-stm32f4 | grep ccm
10000000 ? __ccmdata_end
0800b314 R __ccmdata_load
10000000 ? __ccmdata_start
00000000 A __ccmdata_words

Since the syntax for the .data section is exactly the same, I'd guess
the ? is because there's nothing in there.

[1] http://sigalrm.blogspot.co.uk/2013/12/using-ccm-memory-on-stm32.html

> I've been following Simon Wrights hint during installation of the
> compiler: First I installed the cross-compiler, then the native
> compiler. (The other way round gprbuild didn't find gcc for some
> reason'.

Not sure what's happening there, and I don't remember ever making that
hint - rather the reverse!