Re: Erroneous installation for GPRBuild on Ubuntu ?

[Simon Wright <simon@pushface.org>]

"Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr> writes:

> I've installed GNAT in Ubuntu (10.10) since 4 months. This works
> fine. Today, I wanted to install AUnit. The documentation stated
> GPRBuild is  required for that. So I installed GPRBuild (which I did
> not installed so  far), and launched the “make” command from the
> “aunit-gpl-2010-src”  directory.
>
> It failed, with this rather surprising message:
>
>> aunit_build.gpr:3:09: warning: no compiler specified forlanguage
>> "Ada", ignoring all its sources
>> […]
>> gprbuild: no sources to compile
>
> How is this possible ? No compiler specified for language "Ada", it says ?
>
> Note: both the FSF Ada compiler and GPRBuild was installed from
> official packages (not installed from scratch).

When you say "GPRBuild was installed from official packages" I suppose
you mean AdaCore's?

I think the trouble is that gprbuild has lots of flexibility to run
different compilers in different circumstances, and this can confuse it.

I presume that your GNAT's gcc and gprbuild are both on your PATH (NB,
gprbuild is looking for "gcc", not "gnatgcc"). If this is OK and
gprbuild still doesn't work, then execute

   $ gcc -v

and check the Target: line; here, I get

   $ gcc -v
   Using built-in specs.
   COLLECT_GCC=gcc
   COLLECT_LTO_WRAPPER=/opt/gcc-4.6.0-x86_64/libexec/gcc/x86_64-apple-darwin10/4.6.0/lto-wrapper
   Target: x86_64-apple-darwin10
   [...]

and you need to tell gprbuild to use that target.

Without,

   $ /opt/gnat-gpl-2010-x86_64/bin/gprbuild -P default
   default.gpr:1:09: no languages defined for this project
   gprbuild: "default" processing failed

With,

   $ /opt/gnat-gpl-2010-x86_64/bin/gprbuild \
     --target=x86_64-apple-darwin10 -P default
   gcc -c -g -gnatQ -gnato -fstack-check -g acc.adb
   [...]