Re: ANN: GCC 4.9.0 (2014) for Max OS X Mavericks

[Simon Wright <simon@pushface.org>]

Stephen Leake <stephen_leake@stephe-leake.org> writes:

> Simon Wright <simon@pushface.org> writes:
>
>> Simon Wright <simon@pushface.org> writes:
>>
>> The first release (gcc-4.9.0-x86_64-apple-darwin13-2014.tar.bz2)
>> contained an error: 'gnat list' didn't recognise library
>> projects. This meant that Emacs ada-mode couldn't be used for library
>> projects.
>
> Another fix for Emacs Ada mode would be to compile gnatinspect or
> gpr-query, and use those; they provide better cross reference support,
> including C++. But if 'gnat list' doesn't work, you probably would not
> be able to compile anything, any way.

What happened was that "gnat <legal-command>", as built with the
compiler, crashed with a SIGSEGV (it exits by raising an exception -
perhaps other tools don't do this, since I saw no evidence of them
failing).

I rebuilt it using the libgnat_util that I'd previously built. This
build, which was the first upload, failed to recognise that the
in-compiler build copies gcc/ada/mlib-tgt-specific-darwin.adb from the
source tree to gcc/ada/tools/mlib-tgt-specific.adb in the build tree,
with the result that libgnat_util contained the default
mlib-tgt-specific.adb from the source tree, which says

   --  By default, libraries are not supported at all

I found this out when using ada-mode for a new project: on attempting to
set the project file, I got

   GPR_PROJECT_PATH=nil
   gnat list -Pscripted_testing.gpr -v 
   scripted_testing.gpr:2:17: object directory "src/.build" not found
   scripted_testing.gpr:4:25: warning: libraries are not supported on this platform
   gnat: "scripted_testing.gpr" processing failed

and I interpreted the "libraries are not supported on this platform" as
the reason for failure. It turns out that it is indeed only a warning:
the error is actually the missing object directory.

Anyway, the fix to "gnat" was to rebuild libgnat_util correctly, then
rebuild "gnat" (and the other tools that depend on libgnat_util - I
think only GNATColl is actually affected).

The reason I didn't notice immediately is that I rarely use the "gnat"
versions of commands explicitly; and, having made the fix, I delayed
uploading it because no one was complaining.


I see gnatinspect, but not gpr_query - is that one of yours? (Google was
no help).

Isn't gnatpath the proper replacement for gnat list? The customization
buffer says it's available on the Ada mode web site, but I don't see it.