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From: Brian Drummond <brian@shapes.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: cannot write to a file in Linux despite +rw permissions
Date: Fri, 18 Jan 2013 10:59:18 +0000 (UTC)
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Date: 2013-01-18T10:59:18+00:00
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On Fri, 18 Jan 2013 02:13:55 -0800, Ada novice wrote:

> Hello,
>       I am a newbie in Linux and I have recently installed swiftlinux,
>       which is Debian based. I am testing my Ada codes. They run well (I
>       have put GNAT GPL 2011 for now), except that I see that I cannot
>       write to text files. I have issued the command "chmod -R +rw" to
>       the parent folder but that doesn't help and neither did running
>       GPS as root help.

> Since the code compiles and runs fine in GPS, I do not understand why
> the file cannot be written in the above case with the X and Y values.
> 
> Guess it must be something on Linux that I am not paying attention to.

Works fine here (OpenSuse 11.3)
gnatmake --version
GNATMAKE 4.6.3 20120531 [gcc-4_6-branch revision 188067]
Copyright (C) 1995-2011, Free Software Foundation, Inc.

Check you are using the Gnat you think you are :
 which gnatmake
/usr/bin/gnatmake

In my case, that's the distribution's own (what you would get by typing
sudo apt-get install gnat
on Debian) I think the Adacore one would be in /usr/gnat/bin.

The system will use whichever is first in the path; you can modify it as 
follows:

echo $PATH
/home/brian/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games

export PATH=/usr/gnat/bin:$PATH

echo $PATH
/usr/gnat/bin:/home/brian/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/
usr/X11R6/bin:/usr/games:

which gnatmake
/usr/gnat/bin/gnatmake

Here, both work on your test. But it is possible you have a broken 
install from Swiftlinux so it may be worth checking.

- Brian