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From: Simon Wright <simon@pushface.org>
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Subject: Re: ANN: GCC 9.1.0 for macOS
Date: Tue, 21 May 2019 08:53:25 +0100
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Date: 2019-05-21T08:53:25+01:00
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Gilbert Gosseyn <hnptz@yahoo.de> writes:

> I meant the latest version of the Ada GNU compiler, assuming that
> future releases can be handled the same way.

Sorry to harp on about this, but .. there is the FSF GCC compiler, which
I've been providing macOS builds for for some time, and there's
AdaCore's Community Edition compiler suite, which contains GPS but has a
more restrictive licence condition. "the Ada GNU compiler" could mean
either.

> I had downloaded the gps.app and used !#/bin/sh.  gcc-9.1.0 and
> gcc-6.1.0 are in opt, but no gnat-ce_2018. However there is a
> opt/GNAT/2018 directory. My gps is in opt/bin. I have exported the
> PATH. If I start gps, it does not compute. However "sudo gps" still
> works.

Not sure how you get to "My gps is in opt/bin"?

I just started a reinstall of CE 2018 and I see that its default install
location is /Users/simon/opt/GNAT/2018 (i.e. ~/opt/GNAT 2018); is that
where you mean? I install to /opt/gnat-ce-2018 so as to keep all my Ada
compiler releases in one place.

>From what you say I'd edit /Applications/GPS.app/Contents/MacOS/gps to
contain

   #!/bin/sh
   export PATH=/opt/gcc-9.1.0/bin:/usr/local/bin:$PATH
   exec $HOME/opt/GNAT/2018/bin/gps

so that when you double-click on /Applications/GPS the compiler you want
is on the path and the proper gps executable gets run (you might need to
replace $HOME by your own home directory, I haven't used $HOME here)

What happens if, from the command line, you say (without sudo)

   $ ~/opt/GNAT/2018/bin/gps &

(worked fine for me; I already have /opt/cc-9.1.0/bin first on my PATH).

"does not compute" isn't helpful in coming to a diagnosis.