Re: GNAT library directory - how to detect it at build time?

[rugxulo@gmail.com]

Hi,

On Tuesday, October 30, 2012 4:02:31 AM UTC-5, Maciej Sobczak wrote:
> 
> Yes, it helped. Not directly, but I have followed this idea and finally ended up with this:
> 
> $ gnatgcc --print-search-dirs | grep 'install: ' | grep -o '/.*'
> 
> The above command extracts the name of GNAT installation
> directory, which I can then inject into the GNAT project
> manager and use to portably link the final program. I
> hope the above will help others as well.

While I'm extremely noobish in all these things, I couldn't help but think you're doing it incorrectly. But my first instinct (basename or dirname) wouldn't work here (and I forgot I had GNAT installed on this machine, so I can actually test).

Just for the record, a quick search shows that POSIX grep doesn't support '-o', so you may wish to avoid that (though further searches show some *BSDs do support it). The easier solution seems to be to just use AWK:

(Thu Nov 08, 03:54 PM) /tmp/doydoy # gnatgcc --print-search-dirs | awk '/install:/ { print $2 }'
/usr/lib/gcc/i486-linux-gnu/4.4.3/

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html