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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Linking problem in GPS 2011
Date: Sat, 22 Oct 2011 14:57:09 +0200
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Date: 2011-10-22T14:57:09+02:00
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Hans Petter Ladim writes:
> Thanks for quick answer!
>
> The command:
> $ dpkg -L libc6-dev | grep /crt1.o
> Gives:
> /usr/lib/x86_64-linux-gnu/crt1.o
>
> The command:
>  $ /usr/gnat/libexec/gcc/x86_64-pc-linux-gnu/4.5.3/ld --verbose | grep
> SEARCH_DIR | tr ' ' '\n'
> Gives:
> SEARCH_DIR("/usr/gnat/x86_64-pc-linux-gnu/lib64");
> SEARCH_DIR("/usr/gnat/lib64");
> SEARCH_DIR("/usr/local/lib64");
> SEARCH_DIR("/lib64");
> SEARCH_DIR("/usr/lib64");
> SEARCH_DIR("/usr/gnat/x86_64-pc-linux-gnu/lib");
> SEARCH_DIR("/usr/gnat/lib");
> SEARCH_DIR("/usr/local/lib");
> SEARCH_DIR("/lib");
> SEARCH_DIR("/usr/lib");

OK, that confirms my suspicions.

> And command export LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu does not
> help. Still same error message.

ld will not see the LD_LIBRARY_PATH unless you start it from the same
shell where you did the export, i.e. try to launch a terminal and say:

export LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu
gnatmake -d -P/home/hp/gpsproject/pwm/pwm.gpr
gps

in the same terminal window.

Is that what you did?

> I belive the version of GPS you get from installing through apt-get is
> somewhat old?

I don't know what version your distribution contains but the latest in
Debian testing are gnat-4.4 4.4.6-5 and gnat-gps 4.3-6.  Note that GPS
is only the integrated development environment; the compiler is gnat.

What do you prefer: a "somewhat old" compiler that works, or a "somewhat
new" compiler that doesn't work?  Is there any particular feature of the
"somewhat new" tools that is absent from the Debian packages and that
you need?

> I hope to fix this problem using GPS 2011.
>
> Any more ideas? :)

* Check that ld sees the LD_LIBRARY_PATH environment variable as I
  explained above.  If this works then you can make the solution
  permanent by adding this to your ~/.xsessionrc:

export LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu

This change will take effect after you log out and log back in.

* If that still fails, log in as root and say:

ln -s /usr/lib/x86_64-linux-gnu/*.o /usr/lib

but this is only a temporary hack, not a proper solution.

-- 
Ludovic Brenta.