Re: Question about GNAT gprconfig

[Zack Boll <zackboll@gmail.com>]

On Sunday, March 6, 2016 at 5:26:20 PM UTC-5, Zack Boll wrote:
> On Sunday, March 6, 2016 at 6:17:17 AM UTC-5, Simon Wright wrote:
> > 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.
> 
> Thanks, I was able to edit the existing GNAT line to support powerpc64-linux as a target.  Hopefully I will be able to get C and C++ building correctly with gprbuild.

I seem to be having trouble getting my hello world C++ program to compile with gprbuild.  I think it is trying to use the x86_64 version of "ar".  Below is my output from gprbuild with the "-v" flag.

gprbuild --target=powerpc64-e6500-linux-gnu -v -d -P/project/hello_world_cpp/hello_world_cpp.gpr -XADA_DIALECT=Ada_2012 -XARCHITECTURE=PowerPC64_Linux -XBUILD_FLAGS=Optimize -XELABORATION_CHECKS=Static -XCOMPILER_MULTIPROCESS=8 -XDEBUG_TARGET=local hello_world.cpp -s -j6
GPRBUILD GPL 2015 (20150428) (x86_64-pc-linux-gnu)
Copyright (C) 2004-2015, Free Software Foundation, Inc.
 18 lines: No errors
gprconfig --batch -o /project/hello_world_cpp/auto.cgpr --target=powerpc64-e6500-linux-gnu --config=c++,,,,powerpc64-e6500-linux-gnu-g++ --config=ada,,,,powerpc64-e6500-linux-gnu-gnatmake
Creating configuration file: /project/hello_world_cpp/auto.cgpr
Checking configuration /project/hello_world_cpp/auto.cgpr
   Checking /project/hello_world_cpp/hello_world.cpp ...
      -> object file /project/hello_world_cpp/hello_world.o does not exist
Changing to object directory of "hello_world_cpp": "/project/hello_world_cpp/"
/tools/gnat/powerpc64-e6500-linux-gnu/bin/powerpc64-e6500-linux-gnu-g++ -mtune=e6500 -mlongcall -mpowerpc -maltivec /project/hello_world_cpp/hello_world.cpp
   Checking /project/common/dummy_common.adb ...
   Checking binder generated files for hello_world.cpp...
      -> up to date
   Checking libhello_world_cpp.a ...
      -> archive does not exist
/tools/gnat/x86_64_gpl/bin/ar cr libhello_world_cpp.a /project/hello_world_cpp/hello_world.o
/tools/gnat/x86_64_gpl/bin/ar: /project/hello_world_cpp/hello_world.o: No such file or directory
global archive for project hello_world_cpp could not be built
gprbuild: link of hello_world.cpp failed
[2016-03-06 19:04:50] process exited with status 4, 100% (2/2), elapsed time: 00.42s

Below is the C++ compiler I defined in the compilers.xml file.
  <!-- G++ for GNU Linux -->
  <compiler_description>
  <name>G++-PPC64</name>
  <executable prefix="1">(powerpc64-e6500-linux-gnu)-g\+\+</executable>
  <version>
      <external>${PREFIX}-g++ -v</external>
      <nogrep regexp="for GNAT Pro"></nogrep>
      <grep regexp="^gcc \S+ (\S+)" group="1"></grep>    
  </version>
  <languages>C++</languages>
  <target>
    <external>${PREFIX}-g++ -dumpmachine</external>
      <grep regexp="[^\r\n]+"></grep>
    </target>
  </compiler_description>