Re: [Protux-devel] getting installation dir from autostuff

[Martin Herren]

On Fri, 06 Dec 2002 17:58:11 +0000
Luciano Giordana <address@hidden> wrote:
> do you have some tip on how to get the installation dir from autostuff from 
> withing the code ?
> something like, QString p = getenv("INSTALLPATH") ?

getenv loads the environement variable at runtime, is it what you want ? In 
this case the variable should be set in the shell's config file... i don't 
think this would be a clean solution, but would allow to change the install-dir 
without recompiling the code.

I think this kind of stuff should be choosen at compile time and 'compiled-in'.
I don't really know how autoconf can set this variable so that you can get it 
from within the code, but i know how you can give it to the compiler so that 
you can get it within the code... and Tapio will perhaps know how autoconf will 
be able to give the install-dir to the compiler ;-)

ok, lot's of unclear talking... let me give an example in C:

----- program.c -----
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{
        printf("install-path = %s\n", INSTALLPATH);

        exit(0);
}
-----

if now you compile it with
        gcc program.c -o program -D INSTALLPATH=\"/usr/local/bin\"
the program will output
        install-path = /usr/local/bin
of course if you forget to give -D INSTALLPATH=\"...\" to the compiler, it 
won't compile.

Now all we need is that autoconf adds a -D INSTALLPATH=\"...\" containing the 
right path to the compiler options...

hth

/Martin



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Martin Herren                             +41 (0)79 746 57 83
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