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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Linking problem in GPS 2011
Date: Fri, 21 Oct 2011 22:35:24 +0200
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Date: 2011-10-21T22:35:24+02:00
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Hans Petter Ladim writes on comp.lang.ada:
> Hello,
> I want to use GPS 2011 GPL edition from Adacore on my Linux Mint based
> on debian.
> I have installed GPS with the doinstall command using the default
> install settings all the way.
> I have also installed libc6-dev with apt-get install libc6-dev.
> The problem is that the project in GPS will not link.
> The error from the GPS output is:
>
> gnatmake -d -P/home/hp/gpsproject/pwm/pwm.gpr
> gnatbind -I- -x /home/hp/gpsproject/pwm/test_pwm.ali
> gnatlink /home/hp/gpsproject/pwm/test_pwm.ali -o /home/hp/gpsproject/
> pwm/test_pwm
> /usr/gnat/libexec/gcc/x86_64-pc-linux-gnu/4.5.3/ld: crt1.o: No such
> file: No such file or directory
> collect2: ld returned 1 exit status
> gnatlink: error when calling /usr/gnat/bin/gcc
> gnatmake: *** link failed.
>
> The  command: readlink -f ld gives /home/hp/ld.
> But I also find (as given i the error above) ld in /usr/gnat/libexec/
> gcc/x86_64-pc-linux-gnu/4.5.3/ld
>
> I am new toboth Ada and Linux so this may be a very simple problem!
> I hope my information about the problem was suffcient.

Yes, your report is very detailed and I commend you for the precise
description of your problem.

>From what you say, it seems that crt1.o is either absent or not where
GNAT GPL's ld looks for it.  Could you try:

$ dpkg -L libc6-dev | grep /crt1.o

$ /usr/gnat/libexec/gcc/x86_64-pc-linux-gnu/4.5.3/ld --verbose \
 | grep SEARCH_DIR | tr ' ' '\n'

On my Debian system (where GNAT GPL Edition is not installed; I use
/usr/bin/ld instead), this yields

/usr/lib/x86_64-linux-gnu/crt1.o

SEARCH_DIR("/usr/x86_64-linux-gnu/lib64");
SEARCH_DIR("=/usr/local/lib/x86_64-linux-gnu");
SEARCH_DIR("=/usr/local/lib64");
SEARCH_DIR("=/lib/x86_64-linux-gnu");
SEARCH_DIR("=/lib64");
SEARCH_DIR("=/usr/lib/x86_64-linux-gnu");
SEARCH_DIR("=/usr/lib64");
SEARCH_DIR("=/usr/local/lib");
SEARCH_DIR("=/lib");
SEARCH_DIR("=/usr/lib");

As you can see, on my system crt1.o is in one of the directories of the
SEARCH_DIR of ld.  This is a multiarch-aware directory, not just
/usr/lib; the transition to multiarch started in August this year and
unfortunately breaks older toolchains as explained here:

http://bugs.debian.org/637232

I suspect that your Linux Mint is recent (August 2011 or later) and that
the ld that comes with GNAT GPL Edition is not multiarch-aware and
therefore looks in /usr/lib and not in /usr/lib/x86_64-linux-gnu.

One solution is to

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

before you call gnatmake from GPS.

Another solution is to simply use the Debian packages for Ada
development, which are all multiarch-aware:

aptitude install gnat gnat-gps

Hope this helps

-- 
Ludovic Brenta.