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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Question about GNAT gprconfig
Date: Sun, 06 Mar 2016 11:17:14 +0000
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Date: 2016-03-06T11:17:14+00:00
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Zack Boll <zackboll@gmail.com> writes:

> I recently built a GCC Ada cross-compiler for the PowerPC64
> architecture using crosstool-ng.  I can compile my Ada programs fine
> using powerpc64-e6500-linux-gnu-gnatmake but I have been unable to
> build with gprbuild and appropriate project files.  I have traced this
> down to an issue with gprconfig not recognizing my compiler.
>
> When I run gprconfig --show-targets
> I get:
> arm-linux-gnueabihf (Raspberry Pi2 Cross Compiler downloaded from
> Adacores website)
> x86_64-linux-gnu
>
> But I don't see powerpc64-e6500-linux-gnu even though the compiler
> executable is in my path.  Does anyone know what the issue might be?

I think that gprconfig's compiler description file (at
$prefix/share/gprconfig/compilers.xml) doesn't recognise your target.

You could edit that file directly; might be better to start by writing a
description just for your compiler, starting just from the GNAT section
at about line 687,

<?xml version="1.0" ?>
<gprconfig>
  <compiler_description>
    <name>GNAT-PPC64</name>
    <executable prefix="1">(powerpc64-e6500-linux-gnu-)?gnatmake</executable>
    <version>
      <external>${PREFIX}gnatls -v --version</external>
      <grep regexp="^GNATLS.+?(\d+(\.\d+)?)" group="1"></grep>
    </version>
    <languages>Ada</languages>
    <variable name="gcc_version">
      <external>${PREFIX}gcc -v</external>
      <grep regexp="^[-\w]*gcc \S+ (\S+)" group="1"></grep>
    </variable>
    <runtimes default="default,kernel,native">
       <directory group="default" >\.\./lib/gcc(-lib)?/$TARGET/$gcc_version/adalib/</directory>
       <directory group="default" contents="^rts-">\.\./lib/gcc(-lib)?/$TARGET/$gcc_version/ada_object_path</directory>
       <directory group="2" >\.\./lib/gcc(-lib)?/$TARGET/$gcc_version/rts-(.*)/adalib/</directory>
       <directory group="1" >\.\./$TARGET/lib/gnat/(.*)/adalib/</directory>
    </runtimes>
    <target>
      <external>${PREFIX}gcc -dumpmachine</external>
      <grep regexp="[^\r\n]+"></grep>
    </target>
  </compiler_description>
</gprconfig>

(not sure you need all of the <runtimes/> section) and put this in
x-compilers.xml alongside the original compilers.xml (or locally, using
the gprbuild --db switch).

You'll still need to specify --target=powerpc64-e6500-linux-gnu on the
command line, or for Target use "powerpc64-e6500-linux-gnu"; in your
GPR.

If this works, you'll probably want to add sections for C, C++, ASM.