>You probably can mention the same in Makefile. I.e. You may have to >specify /lib64 inside Makefile where it uses libraries instead of /lib. > >Thanks, >Krishnaprasad Yes, this is exactly what I need to do but I was asked if there was some way to choose the right one based on something (like an environment variable) so that the correct compilation/linking occurs whether the machine is a 32 or 64 bit architecture. >What are you trying to do? > >If you have a 64bit platform the default compilation/linking will link >to 64bit libraries. If you specify the -m32 compiler option (and use the >compiler to generate the link commands) then a 32bit application will be >built using 32bit libraries. A 32bit platform will use 32bit libraries, >and can't build 64bit apps. > >There is a variable (not environment) called MACHTYPE which you should >be able to use to differentiate between a 32bit and 64bit environment, >or the output of the command "arch". > >-- >Nigel Wade, System Administrator, Space Plasma Physics Group, > University of Leicester, Leicester, LE1 7RH, UK >E-mail : nmw@xxxxxxxxxxxx >Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555 I was trying to build an application and I eventually realised I needed to modify the supplied Jamfile for my 64 bit architecture (this involved changing cc flags and link the right X11 libraries). So yes I needed to change the -m32 to -m64 and also link to the X11 libraries under /usr/X11R6/lib64/. When I told the original author, he asked me if there was something he could use to detect 32/64 bit architecture and build that into the jamfile so that it would compile correctly for 32 or 64 bit architecture. Hence my question. It turns out that Jam has it's own internal variables. One is called OSPLAT and this should allow you to determine the architecture. However, on my system it comes up blank. I suspect jam needs to be updated to set OSPLAT correctly for newer systems. Thank you both for your suggestions. I'll let the original developer know what I have found. Regards Rodney Borg Maritime Platforms Division Defence Science and Technology Organisation 506 Lorimer Street Fishermans Bend 3207 Australia Tel: +61 3 96268228 Fax: +61 3 96268181 IMPORTANT: This email remains the property of the Australian Defence Organization and is subject to the jurisdiction of section 70 of the Crimes Act 1914. If you have received this email in error, you are requested to contact the sender and delete the email. IMPORTANT: This email remains the property of the Australian Defence Organisation and is subject to the jurisdiction of section 70 of the CRIMES ACT 1914. If you have received this email in error, you are requested to contact the sender and delete the email. -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subjecthttps://www.redhat.com/mailman/listinfo/redhat-list
